Attributes

attributes.py - Contains the ID of all attributes belongs to the module.

class nirfmxspecan.attributes.AttributeID(value)

Bases: Enum

This enum class contains the ID of all attributes belongs to the module.

ACP_ALL_TRACES_ENABLED = 1052705

Specifies whether to enable the traces to be stored and retrieved after performing the ACP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

ACP_AMPLITUDE_CORRECTION_TYPE = 1052729

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

ACP_AVERAGING_COUNT = 1052693

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

ACP_AVERAGING_ENABLED = 1052694

Specifies whether to enable averaging for the ACP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The ACP measurement uses the ACP Averaging Count attribute as the number of acquisitions over which the ACP measurement is averaged.

ACP_AVERAGING_TYPE = 1052696

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for ACP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

ACP_CARRIER_FREQUENCY = 1052676

Specifies the center frequency of the carrier, relative to the RF CENTER_FREQUENCY. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.

ACP_CARRIER_INTEGRATION_BANDWIDTH = 1052677

Specifies the frequency range over which the measurement integrates the carrier power. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 1 MHz.

ACP_CARRIER_MODE = 1052675

Specifies whether to consider the carrier power as part of the total carrier power measurement.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is Active.

Name (Value)	Description
Passive (0)	The carrier power is not considered as part of the total carrier power.
Active (1)	The carrier power is considered as part of the total carrier power.

ACP_CARRIER_RRC_FILTER_ALPHA = 1052679

Specifies the roll-off factor for the root-raised-cosine (RRC) filter.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.1.

ACP_CARRIER_RRC_FILTER_ENABLED = 1052678

Specifies whether to apply the root-raised-cosine (RRC) filter on the acquired carrier channel before measuring the carrier channel power.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is False.

Name (Value)	Description
False (0)	The channel power of the acquired carrier channel is measured directly.
True (1)	The measurement applies the RRC filter on the acquired carrier channel before measuring the carrier channel power.

ACP_DETECTOR_POINTS = 1052739

Specifies the number of trace points after the detector is applied.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1001.

ACP_DETECTOR_TYPE = 1052738

Specifies the type of detector to be used.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is None.

Refer to Spectral Measurements Concepts topic for more information on detector types.

Name (Value)	Description
None (0)	The detector is disabled.
Sample (1)	The middle sample in the bucket is detected.
Normal (2)	The maximum value of the samples within the bucket is detected if the signal only rises or if the signal only falls. If the signal, within a bucket, both rises and falls, then the maximum and minimum values of the samples are detected in alternate buckets.
Peak (3)	The maximum value of the samples in the bucket is detected.
Negative Peak (4)	The minimum value of the samples in the bucket is detected.
Average RMS (5)	The average RMS of all the samples in the bucket is detected.
Average Voltage (6)	The average voltage of all the samples in the bucket is detected.
Average Log (7)	The average log of all the samples in the bucket is detected.

ACP_FAR_IF_OUTPUT_POWER_OFFSET = 1052726

Specifies the offset by which to adjust the IF output power level for offset channels that are far from the carrier channel to improve the dynamic range. This value is expressed in dB. This attribute is used only if you set the MEASUREMENT_METHOD attribute to Dynamic Range and set the IF_OUTPUT_POWER_OFFSET_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 20 dB.

ACP_FFT_OVERLAP = 1052732

Specifies the samples to overlap between the consecutive chunks as a percentage of the SEQUENTIAL_FFT_SIZE attribute when you set the MEASUREMENT_METHOD attribute to Sequential FFT and the FFT_OVERLAP_MODE attribute to User Defined. This value is expressed as a percentage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

ACP_FFT_OVERLAP_MODE = 1052731

Specifies the overlap mode when you set the MEASUREMENT_METHOD attribute to Sequential FFT.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Disabled.

Name (Value)	Description
Disabled (0)	Disables the overlap between the chunks.
Automatic (1)	Measurement sets the overlap based on the value you have set for the ACP FFT Window attribute. When you set the ACP FFT Window attribute to any value other than None, the number of overlapped samples between consecutive chunks is set to 50% of the value of the ACP Sequential FFT Size attribute. When you set the ACP FFT Window attribute to None, the chunks are not overlapped and the overlap is set to 0%.
User Defined (2)	Measurement uses the overlap that you specify in the ACP FFT Overlap attribute.

ACP_FFT_PADDING = 1052698

Specifies the factor by which the time-domain waveform is zero-padded before fast Fourier transform (FFT). The FFT size is given by the following formula:

waveform size * padding

This attribute is used only when the acquisition span is less than the device instantaneous bandwidth of the device.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

ACP_FFT_WINDOW = 1052697

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

ACP_IF_OUTPUT_POWER_OFFSET_AUTO = 1052724

Specifies whether the measurement computes an IF output power level offset for the offset channels to improve the dynamic range of the ACP measurement. This attribute is used only if you set the MEASUREMENT_METHOD attribute to Dynamic Range.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement sets the IF output power level offset using the values of the ACP Near IF Output Power Offset and ACP Far IF Output Power Offset attributes.
True (1)	The measurement automatically computes an IF output power level offset for the offset channels to improve the dynamic range of the ACP measurement.

ACP_MEASUREMENT_ENABLED = 1052672

Specifies whether to enable the ACP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

ACP_MEASUREMENT_METHOD = 1052690

Specifies the method for performing the ACP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Normal.

Name (Value)	Description
Normal (0)	The ACP measurement acquires the spectrum using the same signal analyzer setting across frequency bands. Use this method when measurement speed is desirable over higher dynamic range.
Dynamic Range (1)	The ACP measurement acquires the spectrum using the hardware-specific optimizations for different frequency bands. Use this method to get the best dynamic range. Supported devices: PXIe-5665/5668
Sequential FFT (2)	The ACP measurement acquires I/Q samples for a duration specified by the ACP Sweep Time attribute. These samples are divided into smaller chunks. The size of each chunk is defined by the ACP Sequential FFT Size attribute. The overlap between the chunks is defined by the ACP FFT Overlap Mode attribute. FFT is computed on each of these chunks. The resultant FFTs are averaged to get the spectrum and is used to compute ACP.

ACP_MEASUREMENT_MODE = 1052733

Specifies whether the measurement calibrates the noise floor of analyzer or performs the ACP measurement. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Measure.

Name (Value)	Description
Measure (0)	ACP measurement is performed on the acquired signal.
Calibrate Noise Floor (1)	Manual noise calibration of the signal analyzer is performed for the ACP measurement.

ACP_NEAR_IF_OUTPUT_POWER_OFFSET = 1052725

Specifies the offset by which to adjust the IF output power level for offset channels that are near to the carrier channel to improve the dynamic range. This value is expressed in dB. This attribute is used only if you set the MEASUREMENT_METHOD attribute to Dynamic Range and set the IF_OUTPUT_POWER_OFFSET_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 dB.

ACP_NOISE_CALIBRATION_AVERAGING_AUTO = 1052736

Specifies whether RFmx automatically computes the averaging count used for instrument noise calibration.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	RFmx uses the averages that you set for the ACP Noise Cal Averaging Count attribute.
True (1)	When you set the ACP Meas Method attribute to Normal or Sequential FFT, RFmx uses a noise calibration averaging count of 32. When you set the ACP Meas Method attribute to Dynamic Range and the sweep time is less than 5 ms, RFmx uses a noise calibration averaging count of 15. When you set the ACP Meas Method attribute to Dynamic Range and the sweep time is greater than or equal to 5 ms, RFmx uses a noise calibration averaging count of 5.

ACP_NOISE_CALIBRATION_AVERAGING_COUNT = 1052735

Specifies the averaging count used for noise calibration when you set the NOISE_CALIBRATION_AVERAGING_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 32.

ACP_NOISE_CALIBRATION_MODE = 1052737

Specifies whether the noise calibration and measurement is performed manually by the user or automatically by RFmx. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Auto.

Name (Value)	Description
Manual (0)	When you set the ACP Meas Mode attribute to Calibrate Noise Floor, you can initiate instrument noise calibration for the ACP measurement manually. When you set the ACP Meas Mode attribute to Measure, you can initiate the ACP measurement manually.
Auto (1)	When you set the ACP Noise Comp Enabled to True, RFmx sets the Input Isolation Enabled attribute to Enabled and calibrates the instrument noise in the current state of the instrument. RFmx then resets the Input Isolation Enabled attribute and performs the ACP measurement, including compensation for noise of the instrument. RFmx skips noise calibration in this mode if valid noise calibration data is already cached. When you set the ACP Noise Comp Enabled attribute to False, RFmx does not calibrate instrument noise and only performs the ACP measurement without compensating for noise of the instrument.

ACP_NOISE_COMPENSATION_ENABLED = 1052704

Specifies whether RFmx compensates for the instrument noise while performing the measurement when you set the NOISE_CALIBRATION_MODE attribute to Auto, or when you set the ACP Noise Cal Mode attribute to Manual and MEASUREMENT_MODE to Measure. Refer to the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables noise compensation.
True (1)	Enables noise compensation.

ACP_NOISE_COMPENSATION_TYPE = 1052734

Specifies the noise compensation type. Refer to the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Analyzer and Termination.

Name (Value)	Description
Analyzer and Termination (0)	Compensates for noise from the analyzer and the 50-ohm termination. The measured power values are in excess of the thermal noise floor.
Analyzer Only (1)	Compensates for the analyzer noise only.

ACP_NUMBER_OF_ANALYSIS_THREADS = 1052692

Specifies the maximum number of threads used for parallelism for adjacent channel power (ACP) measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

ACP_NUMBER_OF_CARRIERS = 1052674

Specifies the number of carriers.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

ACP_NUMBER_OF_OFFSETS = 1052680

Specifies the number of offset channels.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

ACP_OFFSET_ENABLED = 1052681

Specifies whether to enable the offset channel for ACP measurement.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	Disables the offset channel for ACP measurement.
True (1)	Enables the offset channel for ACP measurement.

ACP_OFFSET_FREQUENCY = 1052682

Specifies the center or edge frequency of the offset channel, relative to the center frequency of the closest carrier as determined by the OFFSET_FREQUENCY_DEFINITION attribute. This value is expressed in Hz. The sign of offset frequency is ignored and the OFFSET_SIDEBAND attribute determines whether the upper, lower, or both offsets are measured.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 1 MHz.

ACP_OFFSET_FREQUENCY_DEFINITION = 1052727

Specifies the offset frequency definition used to specify the OFFSET_FREQUENCY attribute.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Carrier Center to Offset Center.

Name (Value)	Description
Carrier Center to Offset Center (0)	The offset frequency is defined from the center of the closest carrier to the center of the offset channel.
Carrier Center to Offset Edge (1)	The offset frequency is defined from the center of the closest carrier to the nearest edge of the offset channel.

ACP_OFFSET_INTEGRATION_BANDWIDTH = 1052686

Specifies the frequency range, over which the measurement integrates the offset channel power. This value is expressed in Hz.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 1 MHz.

ACP_OFFSET_POWER_REFERENCE_CARRIER = 1052684

Specifies the carrier to be used as power reference to measure the offset channel relative power. The offset channel power is measured only if you set the CARRIER_MODE attribute of the reference carrier to Active.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Closest.

Name (Value)	Description
Closest (0)	The measurement uses the power measured in the carrier closest to the offset channel center frequency, as the power reference.
Highest (1)	The measurement uses the highest power measured among all the active carriers as the power reference.
Composite (2)	The measurement uses the sum of powers measured in all the active carriers as the power reference.
Specific (3)	The measurement uses the power measured in the carrier that has an index specified by the ACP Offset Pwr Ref Specific attribute, as the power reference.

ACP_OFFSET_POWER_REFERENCE_SPECIFIC = 1052685

Specifies the index of the carrier to be used as the reference carrier. The power measured in this carrier is used as the power reference for measuring the offset channel relative power, when you set the OFFSET_POWER_REFERENCE_CARRIER attribute to Specific.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 0.

ACP_OFFSET_RELATIVE_ATTENUATION = 1052687

Specifies the attenuation relative to the external attenuation specified by the EXTERNAL_ATTENUATION attribute. This value is expressed in dB. Use the ACP Offset Rel Attn attribute to compensate for variations in external attenuation when the offset channels are spread wide in frequency.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 0.

ACP_OFFSET_RRC_FILTER_ALPHA = 1052689

Specifies the roll-off factor for the root-raised-cosine (RRC) filter.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 0.1.

ACP_OFFSET_RRC_FILTER_ENABLED = 1052688

Specifies whether to apply the root-raised-cosine (RRC) filter on the acquired offset channel before measuring the offset channel power.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is False.

Name (Value)	Description
False (0)	The channel power of the acquired offset channel is measured directly.
True (1)	The measurement applies the RRC filter on the acquired offset channel before measuring the offset channel power.

ACP_OFFSET_SIDEBAND = 1052683

Specifies whether the offset channel is present on one side, or on both sides of the carrier.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Both.

Name (Value)	Description
Neg (0)	Configures a lower offset segment to the left of the leftmost carrier.
Pos (1)	Configures an upper offset segment to the right of the rightmost carrier.
Both (2)	Configures both negative and positive offset segments.

ACP_POWER_UNITS = 1052691

Specifies the units for the absolute power.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is dBm.

Name (Value)	Description
dBm (0)	The absolute powers are reported in dBm.
dBm/Hz (1)	The absolute powers are reported in dBm/Hz.

ACP_RBW_FILTER_AUTO_BANDWIDTH = 1052699

Specifies whether the measurement computes the resolution bandwidth (RBW).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the ACP RBW attribute.
True (1)	The measurement computes the RBW.

ACP_RBW_FILTER_BANDWIDTH = 1052700

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired signal, when you set the RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 kHz.

ACP_RBW_FILTER_BANDWIDTH_DEFINITION = 1052728

Specifies the bandwidth definition which you use to specify the value of the RBW_FILTER_BANDWIDTH attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3dB bandwidth of the RBW filter. When you set the ACP RBW Filter Type attribute to FFT Based, RBW is the 3dB bandwidth of the window specified by the ACP FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the bin width of the spectrum computed using FFT when you set the ACP RBW Filter Type attribute to FFT Based.

ACP_RBW_FILTER_TYPE = 1052701

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	An RBW filter with a Gaussian response is applied.
Flat (2)	An RBW filter with a flat response is applied.

ACP_RESULTS_CARRIER_ABSOLUTE_POWER = 1052710

Returns the measured carrier power.

Use “carrier<n>” as the Selector String to read this result.

The carrier power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the ACP Power Units attribute to dBm/Hz.

ACP_RESULTS_CARRIER_FREQUENCY = 1052708

Returns the center frequency of the carrier relative to the CENTER_FREQUENCY attribute. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

ACP_RESULTS_CARRIER_INTEGRATION_BANDWIDTH = 1052709

Returns the frequency range, over which the measurement integrates the carrier power. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

ACP_RESULTS_CARRIER_TOTAL_RELATIVE_POWER = 1052711

Returns the carrier power measured relative to the total carrier power of all active carriers. This value is expressed in dB.

Use “carrier<n>” as the Selector String to read this result.

ACP_RESULTS_FREQUENCY_RESOLUTION = 1052707

Returns the frequency bin spacing of the spectrum acquired by the measurement. This value is expressed in Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

ACP_RESULTS_LOWER_OFFSET_ABSOLUTE_POWER = 1052716

Returns the lower offset channel power.

The offset channel power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the ACP Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_LOWER_OFFSET_FREQUENCY = 1052713

Returns the center frequency of the lower offset channel relative to the center frequency of the closest carrier. The offset frequency has a negative value.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_LOWER_OFFSET_FREQUENCY_REFERENCE_CARRIER = 1052712

Returns the index of the carrier used as a reference to define the center frequency of the lower (negative) offset channel. Lower offset channels are channels that are to the left of the carrier.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_LOWER_OFFSET_INTEGRATION_BANDWIDTH = 1052714

Returns the integration bandwidth used to measure the power in the lower offset channel.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_LOWER_OFFSET_POWER_REFERENCE_CARRIER = 1052715

Returns the index of the carrier used as the power reference to measure the lower (negative) offset channel relative power.

A value of -1 indicates that the total power of all active carriers is used as the reference power. The measurement uses the OFFSET_POWER_REFERENCE_CARRIER attribute to set the power reference.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_LOWER_OFFSET_RELATIVE_POWER = 1052717

Returns the lower offset channel power measured relative to the integrated power of the power reference carrier. This value is expressed in dB.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_TOTAL_CARRIER_POWER = 1052706

Returns the total integrated power, in dBm, of all the active carriers measured when you set the POWER_UNITS attribute to dBm.

Returns the power spectral density, in dBm/Hz, based on the power in all the active carriers measured when you set the ACP Power Units attribute to dBm/Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

ACP_RESULTS_UPPER_OFFSET_ABSOLUTE_POWER = 1052722

Returns the upper offset channel power.

The offset channel power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the ACP Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_UPPER_OFFSET_FREQUENCY = 1052719

Returns the center frequency of the upper offset channel relative to the center frequency of the closest carrier. The offset frequency has a positive value.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_UPPER_OFFSET_FREQUENCY_REFERENCE_CARRIER = 1052718

Returns the index of the carrier used as a reference to define the center frequency of the upper (positive) offset channel. Upper offset channels are channels that are to the right of the carrier.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_UPPER_OFFSET_INTEGRATION_BANDWIDTH = 1052720

Returns the integration bandwidth used to measure the power in the upper offset channel.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_UPPER_OFFSET_POWER_REFERENCE_CARRIER = 1052721

Returns the index of the carrier used as the power reference to measure the upper (positive) offset channel relative power.

A value of -1 indicates that the total power of all active carriers is used as the reference power. The measurement uses the OFFSET_POWER_REFERENCE_CARRIER attribute to set the power reference.

Use “offset<n>” as the Selector String to read this result.

ACP_RESULTS_UPPER_OFFSET_RELATIVE_POWER = 1052723

Returns the upper offset channel power measured relative to the integrated power of the power reference carrier. This value is expressed in dB.

Use “offset<n>” as the Selector String to read this result.

ACP_SEQUENTIAL_FFT_SIZE = 1052730

Specifies the FFT size when you set the MEASUREMENT_METHOD attribute to Sequential FFT.

The default value is 512.

ACP_SWEEP_TIME_AUTO = 1052702

Specifies whether the measurement computes the sweep time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the ACP Sweep Time attribute.
True (1)	The measurement calculates the sweep time based on the value of the ACP RBW attribute.

ACP_SWEEP_TIME_INTERVAL = 1052703

Specifies the sweep time when you set the SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

AMPM_ALL_TRACES_ENABLED = 1105937

Specifies whether to enable the traces to be stored and retrieved after performing the AMPM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

AMPM_AM_TO_AM_CURVE_FIT_ORDER = 1105922

Specifies the degree of the polynomial used to approximate the AM-to-AM characteristic of the device under test (DUT).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 7.

AMPM_AM_TO_AM_CURVE_FIT_TYPE = 1105923

Specifies the polynomial approximation cost-function of the device under test AM-to-AM characteristic.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Least Absolute Residual.

Name (Value)	Description
Least Square (0)	The measurement minimizes the energy of the polynomial approximation error.
Least Absolute Residual (1)	The measurement minimizes the magnitude of the polynomial approximation error.
Bisquare (2)	The measurement excludes the effect of data outliers while minimizing the energy of the polynomial approximation error.

AMPM_AM_TO_AM_ENABLED = 1105969

Specifies whether to enable the results that rely on the AM to AM characteristics.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Disables the computation of following scalar results and traces. Empty array is returned if the disabled result is an array. NaN is returned otherwise. The following scalar results are disabled: AMPM Results Mean Linear Gain AMPM Results 1 dB Compression Point AMPM Results Input Compression Point AMPM Results Output Compression Point AMPM Results Gain Error Range AMPM Results AM to AM Curve Fit Residual AMPM Results AM to AM Curve Fit Coeff The following traces are disabled: Measured AM to AM Curve Fit AM to AM Relative Power Trace
True (1)	Enables the computation of AM to AM results and traces.

AMPM_AM_TO_PM_CURVE_FIT_ORDER = 1105924

Specifies the degree of the polynomial used to approximate the AM-to-PM characteristic of the device under test.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 7.

AMPM_AM_TO_PM_CURVE_FIT_TYPE = 1105925

Specifies the polynomial approximation cost-function of the device under test AM-to-PM characteristic.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Least Absolute Residual.

Name (Value)	Description
Least Square (0)	The measurement minimizes the energy of the polynomial approximation error.
Least Absolute Residual (1)	The measurement minimizes the magnitude of the polynomial approximation error.
Bisquare (2)	The measurement excludes the effect of data outliers while minimizing the energy of the polynomial approximation error.

AMPM_AM_TO_PM_ENABLED = 1105970

Specifies whether to enable the results that rely on AM to PM characteristics.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Disables the computation of following scalar results and traces. Empty array is returned if the disabled result is an array. NaN is returned otherwise. The following scalar results are disabled: AMPM Results Mean Phase Error AMPM Results Phase Error Range AMPM Results AM to PM Curve Fit Residual AMPM Results AM to PM Curve Fit Coefficients The following traces are disabled: Measured AM to PM Curve Fit AM to PM Relative Phase Trace
True (1)	Enables the computation of AM to PM results and traces.

AMPM_AUTO_CARRIER_DETECTION_ENABLED = 1105963

Specifies if auto detection of carrier offset and carrier bandwidth is enabled.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Disables auto detection of carrier offset and carrier bandwidth.
True (1)	Enables auto detection of carrier offset and carrier bandwidth.

AMPM_AVERAGING_COUNT = 1105927

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

AMPM_AVERAGING_ENABLED = 1105926

Specifies whether to enable averaging for the AMPM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The AMPM measurement uses the AMPM Averaging Count attribute as the number of acquisitions over which the signal for the AMPM measurement is averaged.

AMPM_CARRIER_BANDWIDTH = 1105966

Specifies the carrier bandwidth when you set the AUTO_CARRIER_DETECTION_ENABLED attribute to False. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 20 MHz.

AMPM_CARRIER_OFFSET = 1105965

Specifies the carrier offset when you set the AUTO_CARRIER_DETECTION_ENABLED attribute to False. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.

AMPM_COMPRESSION_POINT_ENABLED = 1105956

Enables computation of compression points corresponding to the respective compression levels specified by the COMPRESSION_POINT_LEVEL attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables computation of compression points.
True (1)	Enables computation of compression points.

AMPM_COMPRESSION_POINT_GAIN_REFERENCE = 1105972

Specifies the gain reference for compression point calculation.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Auto.

Name (Value)	Description
Auto (0)	Measurement computes the gain reference to be used for compression point calculation. The computed gain reference is also returned as AMPM Results Mean Linear Gain result.
Reference Power (1)	Measurement uses the gain corresponding to the reference power that you specify for the AMPM Compression Point Gain Ref Pwr attribute as gain reference. The reference power can be configured as either input or output power based on the value of the AMPM Ref Pwr Type attribute.
Max Gain (2)	Measurement uses the maximum gain as gain reference for compression point calculation.
User Defined (3)	Measurement uses the gain that you specify for the AMPM Compression Point User Gain attribute as gain reference for compression point calculation.

AMPM_COMPRESSION_POINT_GAIN_REFERENCE_POWER = 1105973

Specifies the reference power corresponding to the gain reference to be used for compression point calculation when you set the COMPRESSION_POINT_GAIN_REFERENCE attribute to Reference Power. The reference power can be configured as either input or output power based on the value of the REFERENCE_POWER_TYPE attribute. This value is expressed in dBm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20.

AMPM_COMPRESSION_POINT_LEVEL = 1105957

Specifies the compression levels for which the compression points are computed when you set the COMPRESSION_POINT_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

AMPM_COMPRESSION_POINT_USER_GAIN = 1105974

Specifies the gain to be used as the gain reference for compression point calculation when you set the COMPRESSION_POINT_GAIN_REFERENCE attribute to User Defined. This value is expressed in dB.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 20.

AMPM_DUT_AVERAGE_INPUT_POWER = 1105936

Specifies the average power of the signal at the input port of the device under test. This value is expressed in dBm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20 dBm.

AMPM_EQUALIZER_FILTER_LENGTH = 1105968

Specifies the length of the equalizer filter. The measurement maintains the filter length as an odd number by incrementing any even numbered value by one.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 21.

AMPM_EQUALIZER_MODE = 1105967

Specifies whether the measurement equalizes the channel.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Off.

Name (Value)	Description
Off (0)	Equalization is not performed.
Train (1)	The equalizer is turned on to compensate for the effect of the channel.

AMPM_EVM_ENABLED = 1105971

Specifies whether to enable the MEAN_RMS_EVM attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Disables EVM computation. NaN is returned as Mean RMS EVM.
True (1)	Enables EVM computation.

AMPM_FREQUENCY_OFFSET_CORRECTION_ENABLED = 1105953

Enables frequency offset correction for the measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement does not perform frequency offset correction.
True (1)	The measurement computes and corrects any frequency offset between the reference and the acquired waveforms.

AMPM_IQ_ORIGIN_OFFSET_CORRECTION_ENABLED = 1105961

Enables IQ origin offset correction for the measurement.

When you set this attribute is set to True, the measurement computes and corrects any origin offset between the reference and the acquired waveforms. When you set this attribute to False, origin offset correction is not performed.

The default value is True.

Name (Value)	Description
False (0)	Disables IQ origin offset correction.
True (1)	Enables IQ origin offset correction.

AMPM_MAXIMUM_TIMING_ERROR = 1105954

Specifies the maximum time alignment error expected between the acquired and the reference waveforms. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.00002.

AMPM_MEASUREMENT_ENABLED = 1105920

Specifies whether to enable the AMPM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

AMPM_MEASUREMENT_INTERVAL = 1105929

Specifies the duration of the reference waveform considered for the AMPM measurement. When the reference waveform contains an idle duration, the AMPM measurement neglects the idle samples in the reference waveform leading up to the start of the first active portion of the reference waveform. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100E-6.

AMPM_MEASUREMENT_SAMPLE_RATE = 1105932

Specifies the acquisition sample rate when you set the MEASUREMENT_SAMPLE_RATE_MODE attribute to User. This value is expressed in samples per second (S/s).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 120,000,000.

AMPM_MEASUREMENT_SAMPLE_RATE_MODE = 1105931

Specifies whether the acquisition sample rate is based on the reference waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Reference Waveform.

Name (Value)	Description
User (0)	The acquisition sample rate is defined by the value of the AMPM Meas Sample Rate attribute.
Reference Waveform (1)	The acquisition sample rate is set to match the sample rate of the reference waveform.

AMPM_NUMBER_OF_ANALYSIS_THREADS = 1105938

Specifies the maximum number of threads used for parallelism for the AMPM measurement.

The number of threads can range from 1 to the number of physical cores. However, the number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

AMPM_NUMBER_OF_CARRIERS = 1105964

Specifies the number of carriers in the reference waveform when you set the AUTO_CARRIER_DETECTION_ENABLED attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

AMPM_REFERENCE_POWER_TYPE = 1105955

Specifies the reference power used for AM to AM and AM to PM traces.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Input.

Name (Value)	Description
Input (0)	The instantaneous powers at the input port of device under test (DUT) forms the x-axis of AM to AM and AM to PM traces.
Output (1)	The instantaneous powers at the output port of DUT forms the x-axis of AM to AM and AM to PM traces.

AMPM_RESULTS_1_DB_COMPRESSION_POINT = 1105949

Returns the theoretical output power at which the gain of the device under test drops by 1 dB from a gain reference computed based on the value that you specify for the COMPRESSION_POINT_GAIN_REFERENCE attribute. This value is expressed in dBm. This attribute returns NaN when the AM-to-AM characteristics of the device under test are flat.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_AM_TO_AM_CURVE_FIT_COEFFICIENTS = 1105940

Returns the coefficients of the polynomial that approximates the measured AM-to-AM characteristic of the device under test.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_AM_TO_AM_CURVE_FIT_RESIDUAL = 1105945

Returns the approximation error of the polynomial approximation of the measured device under test AM-to-AM characteristic. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_AM_TO_PM_CURVE_FIT_COEFFICIENTS = 1105941

Returns the coefficients of the polynomial that approximates the measured AM-to-PM characteristic of the device under test.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_AM_TO_PM_CURVE_FIT_RESIDUAL = 1105946

Returns the approximation error of the polynomial approximation of the measured AM-to-PM characteristic of the device under test. This value is expressed in degrees.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_COMPRESSION_POINT_GAIN_REFERENCE = 1105975

Returns the gain reference used for compression point calculation. This value is expressed in dB.

You do not need to use a selector string to read this attribute for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals.

AMPM_RESULTS_GAIN_ERROR_RANGE = 1105947

Returns the peak-to-peak deviation of the device under test gain. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_INPUT_COMPRESSION_POINT = 1105958

Returns the theoretical input power at which the gain of the device drops by a compression level, specified through the COMPRESSION_POINT_LEVEL attribute, from a gain reference computed based on the value that you specify for the COMPRESSION_POINT_GAIN_REFERENCE attribute. This value is expressed in dBm.

You do not need to use a selector string to read this attribute for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals.

AMPM_RESULTS_MEAN_LINEAR_GAIN = 1105942

Returns the average linear gain of the device under test, computed by rejecting signal samples containing gain compression. This value is expressed in dB.

AMPM_RESULTS_MEAN_PHASE_ERROR = 1105943

Returns the mean phase error of the acquired signal relative to the reference waveform caused by the device under test. This value is expressed in degrees.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_MEAN_RMS_EVM = 1105944

Returns the ratio, as a percentage, of l²norm of difference between the normalized reference and acquired waveforms, to the l²norm of the normalized reference waveform.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_RESULTS_OUTPUT_COMPRESSION_POINT = 1105959

Returns the theoretical output power at which the gain of the device drops by a compression level, specified through the COMPRESSION_POINT_LEVEL attribute, from a gain reference computed based on the value that you specify for the COMPRESSION_POINT_GAIN_REFERENCE attribute. This value is expressed in dBm.

You do not need to use a selector string to read this attribute for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals.

AMPM_RESULTS_PEAK_REFERENCE_POWER = 1105976

Returns the peak reference power. This value is expressed in dBm.

You do not need to use a selector string to read this attribute for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals.

AMPM_RESULTS_PEAK_REFERENCE_POWER_GAIN = 1105977

Returns the gain at the peak reference power. This value is expressed in dB.

You do not need to use a selector string to read this attribute for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals.

AMPM_RESULTS_PHASE_ERROR_RANGE = 1105948

Returns the peak-to-peak deviation of the phase distortion of the acquired signal relative to the reference waveform caused by the device under test. This value is expressed in degrees.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

AMPM_SIGNAL_TYPE = 1105930

Specifies whether the reference waveform is a modulated signal or a combination of one or more sinusoidal signals. To time-align the sinusoidal reference waveform to the acquired signal, set the AMPM Signal Type attribute to Tones, which switches the AMPM measurement alignment algorithm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Modulated.

Name (Value)	Description
Modulated (0)	The reference waveform is a cellular or connectivity standard signal.
Tones (1)	The reference waveform is a continuous signal comprising of one or more tones.

AMPM_SYNCHRONIZATION_METHOD = 1105962

Specifies the method used for synchronization of acquired waveform with reference waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Direct.

Name (Value)	Description
Direct (1)	Synchronizes the acquired and reference waveforms assuming that sample rate is sufficient to prevent aliasing in intermediate operations. This method is recommended when the measurement sampling rate is high.
Alias Protected (2)	Synchronizes the acquired and reference waveforms while ascertaining that intermediate operations are not impacted by aliasing. This method is recommended for non-contiguous carriers separated by a large gap, and/or when the measurement sampling rate is low. Refer to AMPM concept help for more information.

AMPM_THRESHOLD_DEFINITION = 1105980

Specifies the definition to use for thresholding acquired and reference waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Reference Power Type.

Name (Value)	Description
Input AND Output (0)	Corresponding acquired and reference waveform samples are used for AMPM measurement when both samples are greater or equal to the threshold level.
Reference Power Type (1)	Corresponding acquired and reference waveform samples are used for AMPM measurement when reference waveform sample is greater than or equal to the threshold level and AMPM Ref Pwr Type attribute is set to Input. Corresponding acquired and reference waveform samples are used for AMPM measurement when acquired waveform sample is greater than or equal to the threshold level and AMPM Ref Pwr Type attribute is set to Output.

AMPM_THRESHOLD_ENABLED = 1105933

Specifies whether to enable thresholding of the acquired samples used for the AMPM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	All samples are considered for the AMPM measurement.
True (1)	Samples above the threshold level specified in the AMPM Threshold Level attribute are considered for the AMPM measurement.

AMPM_THRESHOLD_LEVEL = 1105935

Specifies either the relative or absolute threshold power level, based on the value of the THRESHOLD_TYPE attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20 dB.

AMPM_THRESHOLD_TYPE = 1105934

Specifies the reference for the power level used for thresholding.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Relative.

Name (Value)	Description
Relative (0)	The threshold is relative to the peak power of the acquired samples.
Absolute (1)	The threshold is the absolute power, in dBm.

AUTO_LEVEL_INITIAL_REFERENCE_LEVEL = 1048589

Specifies the initial reference level, in dBm, which the auto_level() method uses to estimate the peak power of the input signal.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 30.

CCDF_ALL_TRACES_ENABLED = 1056781

Specifies whether to enable the traces to be stored and retrieved after performing the CCDF measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

CCDF_MEASUREMENT_ENABLED = 1056768

Specifies whether to enable the CCDF measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

CCDF_MEASUREMENT_INTERVAL = 1056770

Specifies the acquisition time for the CCDF measurement. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

CCDF_NUMBER_OF_ANALYSIS_THREADS = 1056771

Specifies the maximum number of threads used for parallelism for CCDF measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

CCDF_NUMBER_OF_RECORDS = 1056772

Specifies the number of acquisitions used for the CCDF measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

CCDF_RBW_FILTER_BANDWIDTH = 1056775

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to measure the signal. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100 kHz.

CCDF_RBW_FILTER_RRC_ALPHA = 1056774

Specifies the roll-off factor for the root-raised-cosine (RRC) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.1.

CCDF_RBW_FILTER_TYPE = 1056776

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is None.

Name (Value)	Description
None (5)	The measurement does not use any RBW filtering.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.
RRC (6)	The RRC filter with the roll-off specified by the CCDF RBW RRC Alpha attribute is used as the RBW filter.

CCDF_RESULTS_MEAN_POWER = 1056782

Returns the average power of all the samples. This value is expressed in dBm. If you set the THRESHOLD_ENABLED attribute to True, samples above the threshold are measured.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_MEAN_POWER_PERCENTILE = 1056783

Returns the percentage of samples that have more power than the mean power.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_MEASURED_SAMPLES_COUNT = 1056791

Returns the total number of samples measured. The total number of samples includes only the samples above the threshold, when you set the THRESHOLD_ENABLED attribute to True.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_ONE_HUNDREDTH_PERCENT_POWER = 1056787

Returns the power above the mean power, over which 0.01% of the total samples in the signal are present. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_ONE_PERCENT_POWER = 1056785

Returns the power above the mean power, over which 1% of the total samples in the signal are present. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_ONE_TENTH_PERCENT_POWER = 1056786

Returns the power above the mean power, over which 0.1% of the total samples in the signal are present. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_ONE_TEN_THOUSANDTH_PERCENT_POWER = 1056789

Returns the power above the mean power, over which 0.0001% of the total samples in the signal are present. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_ONE_THOUSANDTH_PERCENT_POWER = 1056788

Returns the power above the mean power, over which 0.001% of the total samples in the signal are present. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_RESULTS_PEAK_POWER = 1056790

Returns the peak power of the acquired signal, relative to the mean power.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

CCDF_RESULTS_TEN_PERCENT_POWER = 1056784

Returns the power above the mean power, over which 10% of the total samples in the signal are present. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CCDF_THRESHOLD_ENABLED = 1056777

Specifies whether to enable thresholding of the acquired samples to be used for the CCDF measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	All samples are considered for the CCDF measurement.
True (1)	The samples above the threshold level specified in the CCDF Threshold Level attribute are considered for the CCDF measurement.

CCDF_THRESHOLD_LEVEL = 1056778

Specifies either the relative or absolute threshold power level based on the value of the THRESHOLD_TYPE attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20.

CCDF_THRESHOLD_TYPE = 1056779

Specifies the reference for the power level used for thresholding.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Relative.

Name (Value)	Description
Relative (0)	The threshold is relative to the peak power of the acquired samples.
Absolute (1)	The threshold is the absolute power, in dBm.

CENTER_FREQUENCY = 1048577

Specifies the expected carrier frequency of the RF signal that needs to be acquired. This value is expressed in Hz. The signal analyzer tunes to this frequency.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default of this attribute is hardware dependent.

CHP_ALL_TRACES_ENABLED = 1060884

Specifies whether to enable the traces to be stored and retrieved after performing the CHP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

CHP_AMPLITUDE_CORRECTION_TYPE = 1060895

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

CHP_AVERAGING_COUNT = 1060870

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

CHP_AVERAGING_ENABLED = 1060871

Specifies whether to enable averaging for the CHP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The CHP measurement uses the CHP Averaging Count attribute as the number of acquisitions over which the CHP measurement is averaged.

CHP_AVERAGING_TYPE = 1060873

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for CHP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

CHP_CARRIER_FREQUENCY = 1060889

Specifies the center frequency of the carrier, relative to the RF CENTER_FREQUENCY. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.

CHP_CARRIER_INTEGRATION_BANDWIDTH = 1060866

Specifies the frequency range, over which the measurement integrates the power. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 1 MHz.

CHP_CARRIER_RRC_FILTER_ALPHA = 1060880

Specifies the roll-off factor of the root-raised-cosine (RRC) filter.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.1.

CHP_CARRIER_RRC_FILTER_ENABLED = 1060879

Specifies whether to apply the root-raised-cosine (RRC) filter on the acquired channel before measuring the channel power.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is False.

Name (Value)	Description
False (0)	The channel power of the acquired channel is measured directly.
True (1)	The measurement applies the RRC filter on the acquired channel before measuring the channel power.

CHP_DETECTOR_POINTS = 1060902

Specifies the number of trace points after the detector is applied.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1001.

CHP_DETECTOR_TYPE = 1060883

Specifies the type of detector to be used.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is None.

Refer to Spectral Measurements Concepts topic for more information on detector types.

Name (Value)	Description
None (0)	The detector is disabled.
Sample (1)	The middle sample in the bucket is detected.
Normal (2)	The maximum value of the samples within the bucket is detected if the signal only rises or if the signal only falls. If the signal, within a bucket, both rises and falls, then the maximum and minimum values of the samples are detected in alternate buckets.
Peak (3)	The maximum value of the samples in the bucket is detected.
Negative Peak (4)	The minimum value of the samples in the bucket is detected.
Average RMS (5)	The average RMS of all the samples in the bucket is detected.
Average Voltage (6)	The average voltage of all the samples in the bucket is detected.
Average Log (7)	The average log of all the samples in the bucket is detected.

CHP_FFT_PADDING = 1060875

Specifies the factor by which the time-domain waveform is zero-padded before fast Fourier transform (FFT). The FFT size is given by the following formula:

waveform size * padding

This attribute is used only when the acquisition span is less than the device instantaneous bandwidth of the device.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

CHP_FFT_WINDOW = 1060874

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

CHP_MEASUREMENT_ENABLED = 1060864

Specifies whether to enable the CHP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

CHP_MEASUREMENT_MODE = 1060896

Specifies whether the measurement calibrates the noise floor of analyzer or performs the CHP measurement. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Measure.

Name (Value)	Description
Measure (0)	CHP measurement is performed on the acquired signal.
Calibrate Noise Floor (1)	Manual noise calibration of the signal analyzer is performed for the CHP measurement.

CHP_NOISE_CALIBRATION_AVERAGING_AUTO = 1060900

Specifies whether RFmx automatically computes the averaging count used for instrument noise calibration.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	RFmx uses the averages that you set for the CHP Noise Cal Averaging Count attribute.
True (1)	RFmx uses a noise calibration averaging count of 32.

CHP_NOISE_CALIBRATION_AVERAGING_COUNT = 1060899

Specifies the averaging count used for noise calibration when you set the NOISE_CALIBRATION_AVERAGING_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 32.

CHP_NOISE_CALIBRATION_MODE = 1060901

Specifies whether the noise calibration and measurement is performed manually by the user or automatically by RFmx. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Auto.

Name (Value)	Description
Manual (0)	When you set the CHP Meas Mode attribute to Calibrate Noise Floor, you can initiate instrument noise calibration for the CHP measurement manually. When you set the CHP Meas Mode attribute to Measure, you can initiate the CHP measurement manually.
Auto (1)	When you set the CHP Noise Comp Enabled attribute to True, RFmx sets Input Isolation Enabled to Enabled and calibrates the intrument noise in the current state of the instrument. RFmx then resets the Input Isolation Enabled attribute and performs the CHP measurement, including compensation for noise of the instrument. RFmx skips noise calibration in this mode if valid noise calibration data is already cached. When you set the CHP Noise Comp Enabled attribute to False, RFmx does not calibrate instrument noise and performs only the CHP measurement without compensating for the noise contribution of the instrument.

CHP_NOISE_COMPENSATION_ENABLED = 1060897

Specifies whether RFmx compensates for the instrument noise when performing the measurement. To compensate for instrument noise when performing a CHP measurement, set the NOISE_CALIBRATION_MODE attribute to Auto, or set the CHP Noise Cal Mode attribute to Manual and MEASUREMENT_MODE attribute to Measure. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables noise compensation.
True (1)	Enables noise compensation.

CHP_NOISE_COMPENSATION_TYPE = 1060898

Specifies the noise compensation type. Refer to the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Analyzer and Termination.

Name (Value)	Description
Analyzer and Termination (0)	Compensates for noise from the analyzer and the 50 ohm termination. The measured power values are in excess of the thermal noise floor.
Analyzer Only (1)	Compensates for the analyzer noise only.

CHP_NUMBER_OF_ANALYSIS_THREADS = 1060867

Specifies the maximum number of threads used for parallelism for CHP measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

CHP_NUMBER_OF_CARRIERS = 1060888

Specifies the number of carriers.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

CHP_RBW_FILTER_AUTO_BANDWIDTH = 1060876

Specifies whether the measurement computes the resolution bandwidth (RBW).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the CHP RBW attribute.
True (1)	The measurement computes the RBW.

CHP_RBW_FILTER_BANDWIDTH = 1060877

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired signal, when you set the RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 kHz.

CHP_RBW_FILTER_BANDWIDTH_DEFINITION = 1060894

Specifies the bandwidth definition that you use to specify the value of the RBW_FILTER_BANDWIDTH attribute.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3 dB bandwidth of the RBW filter. When you set the CHP RBW Filter Type attribute to FFT Based, RBW is the 3 dB bandwidth of the window specified by the CHP FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the spectrum bin width computed using an FFT when you set the CHP RBW Filter Type attribute to FFT Based.

CHP_RBW_FILTER_TYPE = 1060878

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	An RBW filter with a Gaussian response is applied.
Flat (2)	An RBW filter with a flat response is applied.

CHP_RESULTS_CARRIER_ABSOLUTE_POWER = 1060885

Returns the carrier power measured in the integration bandwidth that you specify in the CARRIER_INTEGRATION_BANDWIDTH attribute. This value is expressed in dBm.

Use “carrier<n>” as the Selector String to read this result.

CHP_RESULTS_CARRIER_FREQUENCY = 1060891

Returns the center frequency of the carrier relative to the CENTER_FREQUENCY attribute. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

CHP_RESULTS_CARRIER_INTEGRATION_BANDWIDTH = 1060892

Returns the frequency range over which the measurement integrates the carrier power. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

CHP_RESULTS_CARRIER_PSD = 1060886

Returns the power spectral density of the channel. This value is expressed in dBm/Hz.

Use “carrier<n>” as the Selector String to read this result.

CHP_RESULTS_CARRIER_RELATIVE_POWER = 1060893

Returns the carrier power measured relative to the total carrier power of all carriers. This value is expressed in dB.

Use “carrier<n>” as the Selector String to read this result.

CHP_RESULTS_FREQUENCY_RESOLUTION = 1060887

Returns the frequency bin spacing of the spectrum acquired by the measurement. This value is expressed in Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CHP_RESULTS_TOTAL_CARRIER_POWER = 1060890

Returns the total integrated carrier power of all carriers, in dBm.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

CHP_SPAN = 1060868

Specifies the frequency range around the center frequency, to acquire for the measurement. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 MHz.

CHP_SWEEP_TIME_AUTO = 1060881

Specifies whether the measurement computes the sweep time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the CHP Sweep Time attribute.
True (1)	The measurement calculates the sweep time based on the value of the CHP RBW attribute.

CHP_SWEEP_TIME_INTERVAL = 1060882

Specifies the sweep time when you set the SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

DIGITAL_EDGE_TRIGGER_EDGE = 1048582

Specifies the active edge for the trigger. This attribute is used only when you set the TRIGGER_TYPE attribute to Digital Edge.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Rising Edge.

Name (Value)	Description
Rising Edge (0)	The trigger asserts on the rising edge of the signal.
Falling Edge (1)	The trigger asserts on the falling edge of the signal.

DIGITAL_EDGE_TRIGGER_SOURCE = 1048581

Specifies the source terminal for the digital edge trigger. This attribute is used only when you set the TRIGGER_TYPE attribute to Digital Edge.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default of this attribute is hardware dependent.

DPD_ALL_TRACES_ENABLED = 1110047

Specifies whether to enable the traces to be stored and retrieved after performing the DPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

DPD_APPLY_DPD_CFR_ENABLED = 1110086

Specifies whether to enable the crest factor reduction (CFR) on the pre-distorted waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables CFR. The maximum increase in PAPR, after pre-distortion, is limited to 6 dB.
True (1)	Enables CFR.

DPD_APPLY_DPD_CFR_MAXIMUM_ITERATIONS = 1110088

Specifies the maximum number of iterations allowed to converge waveform PAPR to target PAPR when you set the CFR_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

DPD_APPLY_DPD_CFR_METHOD = 1110087

Specifies the method used to perform the crest factor reduction (CFR) when you set the CFR_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Clipping.

Name (Value)	Description
Clipping (0)	Hard clips the signal such that the target PAPR is achieved.
Peak Windowing (1)	Scales the peaks in the signal using weighted window function to get smooth peaks and achieve the target PAPR.
Sigmoid (2)	Scales the peaks using modified sigmoid transfer function to get smooth peaks and achieve the target PAPR. This method does not support the filter operation.

DPD_APPLY_DPD_CFR_SHAPING_FACTOR = 1110109

Specifies the shaping factor to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Sigmoid. Refer to DPD concept topic for more information about shaping factor.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 5.

DPD_APPLY_DPD_CFR_SHAPING_THRESHOLD = 1110110

Specifies the shaping threshold to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Sigmoid. This value is expressed in dB. Refer to DPD concept topic for more information about shaping threshold.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -5.

DPD_APPLY_DPD_CFR_TARGET_PAPR = 1110106

Specifies the target PAPR when you set the CFR_ENABLED attribute to True and the CFR_TARGET_PAPR_TYPE attribute to Custom. This value is expressed in dB.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 8.

DPD_APPLY_DPD_CFR_TARGET_PAPR_TYPE = 1110089

Specifies the target PAPR type when you set the CFR_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Input PAPR.

Name (Value)	Description
Input PAPR (0)	Sets the target PAPR for pre-distorted waveform equal to the PAPR of input waveform.
Custom (1)	Sets the target PAPR equal to the value that you set for the Apply DPD CFR Target PAPR attribute.

DPD_APPLY_DPD_CFR_WINDOW_LENGTH = 1110108

Specifies the maximum window length to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Peak Windowing.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

DPD_APPLY_DPD_CFR_WINDOW_TYPE = 1110107

Specifies the window type to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Peak Windowing.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Kaiser-Bessel.

Name (Value)	Description
Flat Top (1)	Uses the flat top window function to scale peaks.
Hanning (2)	Uses the Hanning window function to scale peaks.
Hamming (3)	Uses the Hamming window function to scale peaks.
Gaussian (4)	Uses the Gaussian window function to scale peaks.
Blackman (5)	Uses the Blackman window function to scale peaks.
Blackman-Harris (6)	Uses the Blackman-Harris window function to scale peaks.
Kaiser-Bessel (7)	Uses the Kaiser-Bessel window function to scale peaks.

DPD_APPLY_DPD_CONFIGURATION_INPUT = 1110049

Specifies whether to use the configuration parameters used by the DPD measurement for applying DPD.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Measurement.

Name (Value)	Description
Measurement (0)	Uses the computed DPD polynomial or lookup table for applying DPD on an input waveform using the same RFmx session handle. The configuration parameters for applying DPD such as the DPD DUT Avg Input Pwr, DPD Model, DPD Meas Sample Rate, DPD polynomial, and lookup table are obtained from the DPD measurement configuration.
User (1)	Applies DPD by using a computed DPD polynomial or lookup table on an input waveform. You must set the configuration parameters for applying DPD such as the DPD Apply DPD User DUT Avg Input Pwr, DPD Apply DPD User DPD Model, DPD Apply DPD User Meas Sample Rate, DPD polynomial, and lookup table. You do not need to call the RFmxSpecAn Initiate method when you set the DPD Apply DPD Config Input attribute User.

DPD_APPLY_DPD_LOOKUP_TABLE_CORRECTION_TYPE = 1110050

Specifies the predistortion type when you set the MODEL attribute to Lookup Table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Magnitude and Phase.

Name (Value)	Description
Magnitude and Phase (0)	The measurement predistorts the magnitude and phase of the input waveform.
Magnitude Only (1)	The measurement predistorts only the magnitude of the input waveform.
Phase Only (2)	The measurement predistorts only the phase of the input waveform.

DPD_APPLY_DPD_MEMORY_MODEL_CORRECTION_TYPE = 1110070

Specifies the predistortion type when you set the MODEL attribute to Memory Polynomial or ** Generalized Memory Polynomial**.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Magnitude and Phase.

Name (Value)	Description
Magnitude and Phase (0)	The measurement predistorts the magnitude and phase of the input waveform.
Magnitude Only (1)	The measurement predistorts only the magnitude of the input waveform.
Phase Only (2)	The measurement predistorts only the phase of the input waveform.

DPD_APPLY_DPD_USER_DPD_MODEL = 1110054

Specifies the DPD model for applying DPD when you set the CONFIGURATION_INPUT attribute to User.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Lookup Table.

Name (Value)	Description
Lookup Table (0)	This model computes the complex gain coefficients applied to linearize systems with negligible memory effects.
Memory Polynomial (1)	This model computes the memory polynomial predistortion coefficients used to linearize systems with moderate memory effects.
Generalized Memory Polynomial (2)	This model computes the generalized memory polynomial predistortion coefficients used to linearize systems with significant memory effects.

DPD_APPLY_DPD_USER_DUT_AVERAGE_INPUT_POWER = 1110053

Specifies the average input power for the device under test that was used to compute the DPD Apply DPD User DPD Polynomial or the DPD Apply DPD User LUT Complex Gain when you set the CONFIGURATION_INPUT attribute to User. This value is expressed in dBm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20 dBm.

DPD_APPLY_DPD_USER_LOOKUP_TABLE_INPUT_POWER = 1105960

Specifies the input power array for the predistortion lookup table when you set the USER_DPD_MODEL attribute to Lookup Table. This value is expressed in dBm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

DPD_APPLY_DPD_USER_LOOKUP_TABLE_TYPE = 1110080

Specifies the DPD Lookup Table (LUT) type when you set the CONFIGURATION_INPUT attribute to User.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

Name (Value)	Description
Log (0)	Input powers in the LUT are specified in dBm.
Linear (1)	Input powers in the LUT are specified in watts.

DPD_APPLY_DPD_USER_MEASUREMENT_SAMPLE_RATE = 1110055

Specifies the acquisition sample rate used to compute the DPD Apply DPD User DPD Polynomial or DPD Apply DPD User LUT Complex Gain when you set the CONFIGURATION_INPUT attribute to User. This value is expressed in Hz. Actual sample rate may differ from requested sample rate in order to ensure a waveform is phase continuous.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 120 MHz.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_LAG_MEMORY_DEPTH = 1110063

Specifies the lag memory depth cross term of the DPD polynomial when you set the USER_DPD_MODEL attribute to Memory Polynomial or Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to Q_bin the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_LAG_ORDER = 1110061

Specifies the lag order cross term of the DPD polynomial when you set the USER_DPD_MODEL attribute to Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to K_bin the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_LEAD_MEMORY_DEPTH = 1110062

Specifies the lead memory depth cross term of the DPD polynomial when you set the USER_DPD_MODEL attribute to Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to Q_cin the DPD for the generalized memory polynomial. The value of the DPD Apply DPD User Mem Poly Lead Mem Depth attribute must be greater than or equal to the value of the USER_MEMORY_POLYNOMIAL_MAXIMUM_LEAD attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_LEAD_ORDER = 1110060

Specifies the lead order cross term of the DPD polynomial when you set the USER_DPD_MODEL attribute to Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to K_cin the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_MAXIMUM_LAG = 1110065

Specifies the maximum lag stagger cross term of the DPD polynomial when you set the USER_DPD_MODEL attribute to Memory Polynomial or Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to M_bin the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_MAXIMUM_LEAD = 1110064

Specifies the maximum lead stagger cross term of the DPD polynomial when you set the USER_DPD_MODEL attribute to Memory Polynomial or Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to M_cin the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_MEMORY_DEPTH = 1110059

Specifies the memory depth of the DPD polynomial when you set the USER_DPD_MODEL attribute to Memory Polynomial or Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to Q_ain the DPD for generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_APPLY_DPD_USER_MEMORY_POLYNOMIAL_ORDER = 1110058

Specifies the order of the DPD polynomial when you set the USER_DPD_MODEL attribute to Memory Polynomial or Generalized Memory Polynomial and set the CONFIGURATION_INPUT attribute to User. This value corresponds to K_ain the DPD for generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3.

DPD_AUTO_CARRIER_DETECTION_ENABLED = 1110091

Specifies if auto detection of carrier offset and carrier bandwidth is enabled.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Disables auto detection of carrier offset and carrier bandwidth.
True (1)	Enables auto detection of carrier offset and carrier bandwidth.

DPD_AVERAGING_COUNT = 1110045

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

DPD_AVERAGING_ENABLED = 1110044

Specifies whether to enable averaging for the DPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The DPD measurement uses the DPD Averaging Count attribute as the number of acquisitions over which the signal for the DPD measurement is averaged.

DPD_CARRIER_BANDWIDTH = 1110094

Specifies the carrier bandwidth when you set the AUTO_CARRIER_DETECTION_ENABLED attribute to False. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 20 MHz.

DPD_CARRIER_OFFSET = 1110093

Specifies the carrier offset when you set the AUTO_CARRIER_DETECTION_ENABLED attribute to False. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.

DPD_DUT_AVERAGE_INPUT_POWER = 1110023

Specifies the average power of the signal at the device under test input port. This value is expressed in dBm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20 dBm.

DPD_DVR_DDR_ENABLED = 1110122

Specifies whether to enable the Dynamic Deviation Reduction (DDR) terms which are a subset of Decomposed Vector Rotation Model when you set the MODEL attribute to Decomposed Vector Rotation. For more details, refer to the DPD for the decomposed vector rotation model.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The Dynamic Deviation Reduction (DDR) terms which are a subset of Decomposed Vector Rotation model are disabled.
True (1)	The Dynamic Deviation Reduction (DDR) terms which are a subset of Decomposed Vector Rotation model are enabled.

DPD_DVR_LINEAR_MEMORY_DEPTH = 1110120

Specifies the linear memory depth of the Decomposed Vector Rotation model when you set the MODEL attribute to Decomposed Vector Rotation. This value corresponds to *M_l*in the DPD for the decomposed vector rotation model.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 21. This value must be greater than or equal to 0.

DPD_DVR_NONLINEAR_MEMORY_DEPTH = 1110121

Specifies the nonlinear memory depth of the Decomposed Vector Rotation model when you set the MODEL attribute to Decomposed Vector Rotation. This value corresponds to *M_nl*in the DPD for the decomposed vector rotation model.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 2. This value must be greater than or equal to 1.

DPD_DVR_NUMBER_OF_SEGMENTS = 1110119

Specifies the number of segments of the Decomposed Vector Rotation model when you set the MODEL attribute to Decomposed Vector Rotation. This value corresponds to K in the DPD for the Decomposed Vector Rotation model.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 4. This value must be greater than or equal to 1.

DPD_FREQUENCY_OFFSET_CORRECTION_ENABLED = 1110073

Specifies whether to enable frequency offset correction for the DPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement computes and corrects any frequency offset between the reference and the acquired waveforms.
True (1)	The measurement does not perform frequency offset correction.

DPD_IQ_ORIGIN_OFFSET_CORRECTION_ENABLED = 1110117

Enables the IQ origin offset correction for the measurement.

When you set this attribute to True, the measurement computes and corrects any origin offset between the reference and the acquired waveforms. When you set this attribute to False, origin offset correction is not performed.

The default value is True.

Name (Value)	Description
False (0)	Disables IQ origin offset correction.
True (1)	Enables IQ origin offset correction.

DPD_ITERATIVE_DPD_ENABLED = 1110042

Specifies whether to enable iterative computation of the DPD Results DPD Polynomial using DPD.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	RFmx computes the DPD Results DPD Polynomial without considering the value of the DPD Previous DPD Polynomial.
True (1)	RFmx computes the DPD Results DPD Polynomial based on the value of the DPD Previous DPD Polynomial.

DPD_LOOKUP_TABLE_AM_TO_AM_CURVE_FIT_ORDER = 1110025

Specifies the degree of the polynomial used to approximate the device under test AM-to-AM characteristic when you set the MODEL attribute to Lookup Table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 7.

DPD_LOOKUP_TABLE_AM_TO_AM_CURVE_FIT_TYPE = 1110026

Specifies the polynomial approximation cost-function of the device under test AM-to-AM characteristic when you set the MODEL attribute to Lookup Table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Least Absolute Residual.

Name (Value)	Description
Least Square (0)	Minimizes the energy of the polynomial approximation error.
Least Absolute Residual (1)	Minimizes the magnitude of the polynomial approximation error.
Bisquare (2)	Excludes the effect of data outliers while minimizing the energy of the polynomial approximation error.

DPD_LOOKUP_TABLE_AM_TO_PM_CURVE_FIT_ORDER = 1110027

Specifies the degree of the polynomial used to approximate the device under test AM-to-PM characteristic when you set the MODEL attribute to Lookup Table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 7.

DPD_LOOKUP_TABLE_AM_TO_PM_CURVE_FIT_TYPE = 1110028

Specifies the polynomial approximation cost-function of the device under test AM-to-PM characteristic when you set the MODEL attribute to Lookup Table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Least Absolute Residual.

Name (Value)	Description
Least Square (0)	Minimizes the energy of the polynomial approximation error.
Least Absolute Residual (1)	Minimizes the magnitude of the polynomial approximation error.
Bisquare (2)	Excludes the effect of data outliers while minimizing the energy of the polynomial approximation error.

DPD_LOOKUP_TABLE_STEP_SIZE = 1110032

Specifies the step size of the input power levels in the predistortion lookup table when you set the MODEL attribute to Lookup Table. This value is expressed in dB.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.1 dB.

DPD_LOOKUP_TABLE_THRESHOLD_DEFINITION = 1110125

Specifies the definition to use for thresholding acquired and reference waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Input.

Name (Value)	Description
Input AND Output (0)	Corresponding acquired and reference waveform samples are used for AMPM measurement when both samples are greater or equal to the threshold level.
Input (1)	Corresponding acquired and reference waveform samples are used for AMPM measurement when reference waveform sample is greater than or equal to the threshold level.

DPD_LOOKUP_TABLE_THRESHOLD_ENABLED = 1110029

Specifies whether to enable thresholding of the acquired samples to be used for the DPD measurement when you set the MODEL attribute to Lookup Table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	All samples are considered for the DPD measurement.
True (1)	Only samples above the threshold level which you specify in the DPD LUT Threshold Level attribute are considered for the DPD measurement.

DPD_LOOKUP_TABLE_THRESHOLD_LEVEL = 1110031

Specifies either the relative or absolute threshold power level based on the value of the LOOKUP_TABLE_THRESHOLD_TYPE attribute. This value is expressed in dB or dBm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20.

DPD_LOOKUP_TABLE_THRESHOLD_TYPE = 1110030

Specifies the reference for the power level used for thresholding.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Relative.

Name (Value)	Description
Relative (0)	The threshold is relative to the peak power of the acquired samples.
Absolute (1)	The threshold is the absolute power, in dBm.

DPD_LOOKUP_TABLE_TYPE = 1110072

Specifies the type of the DPD lookup table (LUT).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Log.

Name (Value)	Description
Log (0)	Input powers in the LUT are specified in dBm.
Linear (1)	Input powers in the LUT are specified in watts.

DPD_MAXIMUM_TIMING_ERROR = 1110074

Specifies the maximum time alignment error expected between the acquired and the reference waveforms. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.00002.

DPD_MEASUREMENT_ENABLED = 1110016

Specifies whether to enable DPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

DPD_MEASUREMENT_INTERVAL = 1110020

Specifies the duration of the reference waveform considered for the DPD measurement. When the reference waveform contains an idle duration, the DPD measurement neglects the idle samples in the reference waveform leading up to the start of the first active portion of the reference waveform. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100E-6.

DPD_MEASUREMENT_MODE = 1110123

Specifies if the training waveform required for the extraction of the DPD model coefficients is acquired from the hardware or is configured by the user.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Acquire and Extract.

Name (Value)	Description
Acquire and Extract (0)	The measurement acquires the training waveform required for the extraction of the DPD model coefficients from the hardware and then computes the model coefficients.
Extract Only (1)	The measurement uses the user configured training waveform required for the extraction of the DPD model coefficients.

DPD_MEASUREMENT_SAMPLE_RATE = 1110019

Specifies the acquisition sample rate when you set the MEASUREMENT_SAMPLE_RATE_MODE attribute to User. This value is expressed in Samples per second (S/s). Actual sample rate may differ from requested sample rate in order to ensure a waveform is phase continuous.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 120 MHz.

DPD_MEASUREMENT_SAMPLE_RATE_MODE = 1110018

Specifies the acquisition sample rate configuration mode.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Reference Waveform.

Name (Value)	Description
User (0)	The acquisition sample rate is defined by the value of the DPD Meas Sample Rate attribute.
Reference Waveform (1)	The acquisition sample rate is set to match the sample rate of the reference waveform.

DPD_MEMORY_POLYNOMIAL_LAG_MEMORY_DEPTH = 1110038

Specifies the lag memory depth cross term of the DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial. This term value corresponds to *Q_b*in the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_LAG_ORDER = 1110036

Specifies the lag order cross term of the DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial. This term value corresponds to *K_b*in the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_LAG_ORDER_TYPE = 1110097

Configures the type of terms of the lag order DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is All Orders.

Name (Value)	Description
All Orders (0)	The memory polynomial will compute all the terms for the given order.
Odd Orders Only (1)	The memory polynomial will compute the non-zero coefficients only for the odd terms.
Even Orders Only (2)	The memory polynomial will compute the non-zero coefficents only for the even terms.

DPD_MEMORY_POLYNOMIAL_LEAD_MEMORY_DEPTH = 1110037

Specifies the lead memory depth cross term of the DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial. This term value corresponds to *Q_c*in the DPD for the generalized memory polynomial. The value of the DPD Mem Poly Lead Mem Depth attribute must be greater than or equal to the value of the MEMORY_POLYNOMIAL_MAXIMUM_LEAD attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_LEAD_ORDER = 1110035

Specifies the lead order cross term of the DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial. This term value corresponds to *K_c*in the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_LEAD_ORDER_TYPE = 1110096

Configures the type of terms of the lead order DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is All Orders.

Name (Value)	Description
All Orders (0)	The memory polynomial will compute all the terms for the given order.
Odd Orders Only (1)	The memory polynomial will compute the non-zero coefficients only for the odd terms.
Even Orders Only (2)	The memory polynomial will compute the non-zero coefficents only for the even terms.

DPD_MEMORY_POLYNOMIAL_MAXIMUM_LAG = 1110040

Specifies the maximum lag stagger cross term of the DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial. This term value corresponds to *M_b*in the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_MAXIMUM_LEAD = 1110039

Specifies the maximum lead stagger cross term of the DPD polynomial when you set the MODEL attribute to Generalized Memory Polynomial. This term value corresponds to *M_c*in the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_MEMORY_DEPTH = 1110034

Specifies the memory depth of the DPD polynomial when you set the MODEL attribute to Memory Polynomial or Generalized Memory Polynomial. This depth value corresponds to Q_ain the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

DPD_MEMORY_POLYNOMIAL_ORDER = 1110033

Specifies the order of the DPD polynomial when you set the MODEL attribute to Memory Polynomial or Generalized Memory Polynomial. This order value corresponds to K_ain the DPD for the generalized memory polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3.

DPD_MEMORY_POLYNOMIAL_ORDER_TYPE = 1110095

Configures the type of terms of the DPD polynomial when you set the MODEL attribute to Memory Polynomial or Generalized Memory Polynomial.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is All Orders.

Name (Value)	Description
All Orders (0)	The memory polynomial will compute all the terms for the given order.
Odd Orders Only (1)	The memory polynomial will compute the non-zero coefficients only for the odd terms.
Even Orders Only (2)	The memory polynomial will compute the non-zero coefficents only for the first linear term and all even terms.

DPD_MODEL = 1110024

Specifies the DPD model used by the DPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Lookup Table.

Name (Value)	Description
Lookup Table (0)	This model computes the complex gain coefficients applied when performing digital predistortion to linearize systems with negligible memory effects.
Memory Polynomial (1)	This model computes the memory polynomial predistortion coefficients used to linearize systems with moderate memory effects.
Generalized Memory Polynomial (2)	This model computes the generalized memory polynomial predistortion coefficients used to linearize systems with significant memory effects.
Decomposed Vector Rotation (3)	This model computes the Decomposed Vector Rotation model predistortion coefficients used to linearize wideband systems with significant memory effects.

DPD_NMSE_ENABLED = 1110075

Specifies whether to enable the normalized mean-squared error (NMSE) computation.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables NMSE computation. NaN is returned as NMSE.
True (1)	Enables NMSE computation.

DPD_NUMBER_OF_ANALYSIS_THREADS = 1110048

Specifies the maximum number of threads used for parallelism of the DPD measurement.

The number of threads can range from 1 to the number of physical cores. However, the number of threads you set may not all be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

DPD_NUMBER_OF_CARRIERS = 1110092

Specifies the number of carriers in the reference waveform when you set the AUTO_CARRIER_DETECTION_ENABLED attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

DPD_PRE_DPD_CARRIER_BANDWIDTH = 1110116

Specifies the carrier bandwidth when you set the CFR_ENABLED attribute and the CFR_FILTER_ENABLED attribute to True. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 20 MHz.

DPD_PRE_DPD_CARRIER_OFFSET = 1110115

Specifies the carrier offset relative to the center of the complex baseband equivalent of the RF signal when you set the CFR_ENABLED attribute and the CFR_FILTER_ENABLED attribute to True. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.

DPD_PRE_DPD_CFR_ENABLED = 1110076

Specifies whether to enable the crest factor reduction (CFR) when applying pre-DPD signal conditioning.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables the CFR. The RFmxSpecAn DPD Apply Pre-DPD Signal Conditioning method returns an error when the CFR is disabled.
True (1)	Enables the CFR.

DPD_PRE_DPD_CFR_FILTER_ENABLED = 1110112

Specifies whether to enable the filtering operation when you set the CFR_ENABLED attribute to True. Refer to DPD concept topic for more information about filtering.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables the filter operation when performing CFR.
True (1)	Enables filter operation when performing CFR. Filter operation is not supported when you set the DPD Pre-DPD CFR Method attribute to Sigmoid.

DPD_PRE_DPD_CFR_MAXIMUM_ITERATIONS = 1110077

Specifies the maximum number of iterations allowed to converge waveform PAPR to target PAPR, when you set the CFR_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

DPD_PRE_DPD_CFR_METHOD = 1110078

Specifies the method used to perform crest factor reduction (CFR) when you set the CFR_ENABLED attribute to True. Refer to DPD concept topic for more information about CFR methods.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Clipping.

Name (Value)	Description
Clipping (0)	Hard clips the signal such that the target PAPR is achieved.
Peak Windowing (1)	Scales the peaks in the signal using weighted window function to get smooth peaks and achieve the target PAPR.
Sigmoid (2)	Scales the peaks using modified sigmoid transfer function to get smooth peaks and achieve the target PAPR. This method does not support the filter operation.

DPD_PRE_DPD_CFR_NUMBER_OF_CARRIERS = 1110114

Specifies the number of carriers in the input waveform when you set the CFR_ENABLED attribute and the CFR_FILTER_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

DPD_PRE_DPD_CFR_SHAPING_FACTOR = 1110084

Specifies the shaping factor to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Sigmoid. Refer to the DPD concept topic for more information about shaping factor.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 5.

DPD_PRE_DPD_CFR_SHAPING_THRESHOLD = 1110085

Specifies the shaping threshold to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Sigmoid. This value is expressed in dB. Refer to the DPD concept topic for more information about shaping threshold.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -5.

DPD_PRE_DPD_CFR_TARGET_PAPR = 1110081

Specifies the target peak-to-average power ratio when you set the CFR_ENABLED attribute to True. This value is expressed in dB.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 8.

DPD_PRE_DPD_CFR_WINDOW_LENGTH = 1110083

Specifies the maximum window length to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Peak Windowing.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

DPD_PRE_DPD_CFR_WINDOW_TYPE = 1110082

Specifies the window type to be used when you set the CFR_ENABLED attribute to True and the CFR_METHOD attribute to Peak Windowing.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Kaiser-Bessel.

Name (Value)	Description
Flat Top (1)	Uses the flat top window function to scale peaks.
Hanning (2)	Uses the Hanning window function to scale peaks.
Hamming (3)	Uses the Hamming window function to scale peaks.
Gaussian (4)	Uses the Gaussian window function to scale peaks.
Blackman (5)	Uses the Blackman window function to scale peaks.
Blackman-Harris (6)	Uses the Blackman-Harris window function to scale peaks.
Kaiser-Bessel (7)	Uses the Kaiser-Bessel window function to scale peaks.

DPD_RESULTS_AVERAGE_GAIN = 1110067

Returns the average gain of the device under test. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

DPD_RESULTS_NMSE = 1110111

Returns the normalized mean-squared DPD modeling error when you set the NMSE_ENABLED attribute to True. This value is expressed in dB. NaN is returned when the NMSE_ENABLED attribute is set to False.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

DPD_SIGNAL_TYPE = 1110021

Specifies whether the reference waveform is a modulated signal or a combination of one or more sinusoidal signals. To time-align the sinusoidal reference waveform to the acquired signal, set the DPD Signal Type attribute to Tones, which switches the DPD measurement alignment algorithm.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Modulated.

Name (Value)	Description
Modulated (0)	The reference waveform is a cellular or connectivity standard signal.
Tones (1)	The reference waveform is a continuous signal comprising one or more tones.

DPD_SYNCHRONIZATION_METHOD = 1110090

Specifies the method used for synchronization of the acquired waveform with the reference waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Direct.

Name (Value)	Description
Direct (1)	Synchronizes the acquired and reference waveforms assuming that sample rate is sufficient to prevent aliasing in intermediate operations. This method is recommended when measurement sampling rate is high.
Alias Protected (2)	Synchronizes the acquired and reference waveforms while ascertaining that intermediate operations are not impacted by aliasing. This method is recommended for non-contiguous carriers separated by a large gap, and/or when measurement sampling rate is low. Refer to DPD concept help for more information.

DPD_TARGET_GAIN_TYPE = 1110071

Specifies the gain expected from the DUT after applying DPD on the input waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Average Gain.

Name (Value)	Description
Average Gain (0)	The DPD polynomial or lookup table is computed by assuming that the linearized gain expected from the DUT after applying DPD on the input waveform is equal to the average power gain provided by the DUT without DPD.
Linear Region Gain (1)	The DPD polynomial or lookup table is computed by assuming that the linearized gain expected from the DUT after applying DPD on the input waveform is equal to the gain provided by the DUT, without DPD, to the parts of the reference waveform that do not drive the DUT into non-linear gain-expansion or compression regions of its input-output characteristics. The measurement computes the linear region gain as the average gain experienced by the parts of the reference waveform that are below a threshold which is computed as shown in the following equation: Linear region threshold (dBm) = Max {-25, Min {reference waveform power} + 6, DUT Average Input Power -15}
Peak Input Power Gain (2)	The DPD polynomial or lookup table is computed by assuming that the linearized gain expected from the DUT after applying DPD on the input waveform is equal to the average power gain provided by the DUT, without DPD, to all the samples of the reference waveform for which the magnitude is greater than the peak power in the reference waveform (dBm) - 0.5dB.

EXTERNAL_ATTENUATION = 1048579

Specifies the attenuation of a switch (or cable) connected to the RF IN connector of the signal analyzer. This value is expressed in dB. For more information about attenuation, refer to the Attenuation and Signal Levels topic for your device in the NI RF Vector Signal Analyzers Help.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

FCNT_ALL_TRACES_ENABLED = 1064976

Specifies whether to enable the traces to be stored and retrieved after performing the FCnt measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

FCNT_AVERAGING_COUNT = 1064965

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

FCNT_AVERAGING_ENABLED = 1064966

Specifies whether to enable averaging for the FCnt measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The FCnt measurement uses the FCnt Averaging Count attribute as the number of acquisitions over which the FCnt measurement is averaged.

FCNT_AVERAGING_TYPE = 1064968

Specifies the averaging type for the FCnt measurement. The averaged instantaneous signal phase difference is used for the measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Mean.

Name (Value)	Description
Mean (6)	The mean of the instantaneous signal phase difference over multiple acquisitions is used for the frequency measurement.
Max (3)	The maximum instantaneous signal phase difference over multiple acquisitions is used for the frequency measurement.
Min (4)	The minimum instantaneous signal phase difference over multiple acquisitions is used for the frequency measurement.
Min Max (7)	The maximum instantaneous signal phase difference over multiple acquisitions is used for the frequency measurement. The sign of the phase difference is ignored to find the maximum instantaneous value.

FCNT_MEASUREMENT_ENABLED = 1064960

Specifies whether to enable the FCnt measurement.

You do not need to use a selector string to read this result for default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

FCNT_MEASUREMENT_INTERVAL = 1064962

Specifies the acquisition time for the FCnt measurement. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

FCNT_NUMBER_OF_ANALYSIS_THREADS = 1064963

Specifies the maximum number of threads used for parallelism for FCnt measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

FCNT_RBW_FILTER_BANDWIDTH = 1064970

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to measure the signal. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100 kHz.

FCNT_RBW_FILTER_RRC_ALPHA = 1064969

Specifies the roll-off factor for the root-raised-cosine (RRC) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.1.

FCNT_RBW_FILTER_TYPE = 1064971

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is None.

Name (Value)	Description
None (5)	The measurement does not use any RBW filtering.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.
RRC (6)	The RRC filter with the roll-off specified by FCnt RBW RRC Alpha attribute is used as the RBW filter.

FCNT_RESULTS_ALLAN_DEVIATION = 1064980

Returns the two-sample deviation of the measured frequency.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

FCNT_RESULTS_AVERAGE_ABSOLUTE_FREQUENCY = 1064979

Returns the RF signal frequency. Only samples above the threshold are used when you set the THRESHOLD_ENABLED attribute to True.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

FCNT_RESULTS_AVERAGE_RELATIVE_FREQUENCY = 1064977

Returns the signal frequency relative to the RF center frequency. Only samples above the threshold are used when you set the THRESHOLD_ENABLED attribute to True.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

FCNT_RESULTS_MEAN_PHASE = 1064978

Returns the net phase of the vector sum of the I/Q samples used for frequency measurement.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

FCNT_THRESHOLD_ENABLED = 1064972

Specifies whether to enable thresholding of the acquired samples to be used for the FCnt measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	All samples are considered for the FCnt measurement.
True (1)	The samples above the threshold level specified in the FCnt Threshold Level attribute are considered for the FCnt measurement.

FCNT_THRESHOLD_LEVEL = 1064973

Specifies either the relative or absolute threshold power level based on the value of the THRESHOLD_TYPE attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20.

FCNT_THRESHOLD_TYPE = 1064974

Specifies the reference for the power level used for thresholding.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Relative.

Name (Value)	Description
Relative (0)	The threshold is relative to the peak power of the acquired samples.
Absolute (1)	The threshold is the absolute power, in dBm.

HARM_ALL_TRACES_ENABLED = 1069072

Specifies whether to enable the traces to be stored and retrieved after performing the Harmonics measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

Supported devices: PXIe-5665/5668

HARM_AUTO_SETUP_ENABLED = 1069064

Specifies whether to enable auto configuration of successive harmonics.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	The measurement uses manual configuration for the harmonic order, harmonic bandwidth, and harmonic measurement interval.
True (1)	The measurement uses the Harm Num Harmonics attribute and configuration of the fundamental to configure successive harmonics. Bandwidth of Nth order harmonic = N * (Bandwidth of fundamental). Measurement interval of Nth order harmonics = (Measurement interval of fundamental)/N

HARM_AVERAGING_COUNT = 1069068

Specifies the number of acquisitions used for averaging when you set the AVERAGING_COUNT attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

Supported devices: PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5668

HARM_AVERAGING_ENABLED = 1069069

Specifies whether to enable averaging for the Harmonics measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The Harmonics measurement uses the Harm Averaging Count attribute as the number of acquisitions over which the Harmonics measurement is averaged.

HARM_AVERAGING_TYPE = 1069071

Specifies the averaging type for the Harmonics measurement. The averaged power trace is used for the measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Supported devices: PXIe-5644/5645/5646, PXIe-5663/5663E/5665/5668

Name (Value)	Description
RMS (0)	The power trace is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power trace is averaged in a logarithmic scale.
Scalar (2)	The square root of the power trace is averaged.
Max (3)	The maximum instantaneous power in the power trace is retained from one acquisition to the next.
Min (4)	The minimum instantaneous power in the power trace is retained from one acquisition to the next.

HARM_FUNDAMENTAL_MEASUREMENT_INTERVAL = 1069062

Specifies the acquisition time for the Harmonics measurement of the fundamental signal. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

Supported devices: PXIe-5665/5668

HARM_FUNDAMENTAL_RBW_FILTER_ALPHA = 1069059

Specifies the roll-off factor for the root-raised-cosine (RRC) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.1.

Supported devices: PXIe-5665/5668

HARM_FUNDAMENTAL_RBW_FILTER_BANDWIDTH = 1069060

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to measure the fundamental signal. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100 kHz.

Supported devices: PXIe-5665/5668

HARM_FUNDAMENTAL_RBW_FILTER_TYPE = 1069061

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Supported devices: PXIe-5665/5668

Name (Value)	Description
None (5)	The measurement does not use any RBW filtering.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.
RRC (6)	The RRC filter with the roll-off specified by the Harm Fundamental RBW RRC Alpha attribute is used as the RBW filter.

HARM_HARMONIC_BANDWIDTH = 1069080

Specifies the resolution bandwidth for the harmonic. This attribute is not used if you set the AUTO_SETUP_ENABLED to True. This value is expressed in Hz.

Use “harmonic<n>” as the Selector String to configure or read this attribute.

The default value is 100 kHz.

Supported devices: PXIe-5665/5668

HARM_HARMONIC_ENABLED = 1069065

Specifies whether to enable a particular harmonic for measurement. Only the enabled harmonics are used to measure the total harmonic distortion (THD). This attribute is not used if you set the AUTO_SETUP_ENABLED to True.

Use “harmonic<n>” as the Selector String to configure or read this attribute.

The default value is True.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	Disables the harmonic for measurement.
True (1)	Enables the harmonic for measurement.

HARM_HARMONIC_MEASUREMENT_INTERVAL = 1069067

Specifies the acquisition time for the harmonic. This value is expressed in seconds. This attribute is not used if you set the AUTO_SETUP_ENABLED to True.

Use “harmonic<n>” as the Selector String to configure or read this attribute.

The default value is 1 ms.

Supported devices: PXIe-5665/5668

HARM_HARMONIC_ORDER = 1069066

Specifies the order of the harmonic. This attribute is not used if you set the AUTO_SETUP_ENABLED to True.

Frequency of Nth order harmonic = N * (Frequency of fundamental)

Use “harmonic<n>” as the Selector String to configure or read this attribute.

The default value is 1.

Supported devices: PXIe-5665/5668

HARM_MEASUREMENT_ENABLED = 1069056

Specifies whether to enable the Harmonics measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

Supported devices: PXIe-5665/5668

HARM_MEASUREMENT_METHOD = 1069082

Specifies the method used to perform the harmonics measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Time Domain.

Name (Value)	Description
Time Domain (0)	The harmonics measurement acquires the signal using the same signal analyzer setting across frequency bands. Use this method when the measurement speed is desirable over higher dynamic range.
Dynamic Range (2)	The harmonics measurement acquires the signal using the hardware-specific features, such as the IF filter and IF gain, for different frequency bands. Use this method to get the best dynamic range.

HARM_NOISE_COMPENSATION_ENABLED = 1069083

Specifies whether to enable compensation of the average harmonic powers for inherent noise floor of the signal analyzer.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables compensation of the average harmonic powers for the noise floor of the signal analyzer.
True (1)	Enables compensation of the average harmonic powers for the noise floor of the signal analyzer. The noise floor of the signal analyzer is measured for the RF path used by the harmonics measurement and cached for future use. If the signal analyzer or measurement parameters change, noise floors are measured again.

HARM_NUMBER_OF_ANALYSIS_THREADS = 1069058

Specifies the maximum number of threads used for parallelism for Harmonics measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

Supported devices: PXIe-5665/5668

HARM_NUMBER_OF_HARMONICS = 1069063

Specifies the number of harmonics, including fundamental, to measure.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3.

Supported devices: PXIe-5665/5668

HARM_RESULTS_AVERAGE_FUNDAMENTAL_POWER = 1069074

Returns the average power measured at the fundamental frequency. This value is expressed in dBm.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

HARM_RESULTS_FUNDAMENTAL_FREQUENCY = 1069073

Returns the frequency used as the fundamental frequency. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

HARM_RESULTS_HARMONIC_AVERAGE_ABSOLUTE_POWER = 1069078

Returns the average absolute power measured at the harmonic specified by the selector string. This value is expressed in dBm.

Use “harmonic<n>” as the Selector String to read this result.

HARM_RESULTS_HARMONIC_AVERAGE_RELATIVE_POWER = 1069079

Returns the average power relative to the fundamental power measured at the harmonic specified by the selector string. This value is expressed in dB.

Use “harmonic<n>” as the Selector String to read this result.

HARM_RESULTS_HARMONIC_FREQUENCY = 1069076

Returns the RF frequency of the harmonic. This value is expressed in Hz.

Use “harmonic<n>” as the Selector String to read this result.

HARM_RESULTS_HARMONIC_RBW = 1069077

Returns the resolution bandwidth (RBW) which is used by the harmonic measurement, for the harmonic specified by the selector string. This value is expressed in Hz.

Use “harmonic<n>” as the Selector String to read this result.

HARM_RESULTS_TOTAL_HARMONIC_DISTORTION = 1069075

Returns the total harmonics distortion (THD), measured as a percentage of the power in the fundamental signal.

THD (%) = SQRT (Total power of all enabled harmonics - Power in fundamental) * 100 / Power in fundamental

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

IDPD_ALL_TRACES_ENABLED = 1310751

Specifies whether to enable the traces to be stored and retrieved after performing the IDPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

IDPD_AVERAGING_COUNT = 1310736

Specifies the number of acquisitions used for averaging when AVERAGING_ENABLED is TRUE.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

IDPD_AVERAGING_ENABLED = 1310735

Specifies whether to enable averaging for the IDPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The number of acquisitions is 1.
True (1)	the measurement uses Averaging Count for the number of acquisitions over which the measurement is averaged.

IDPD_DUT_AVERAGE_INPUT_POWER = 1310732

Specifies the initial (first itertion) average power of the signal at the input port of the device under test.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -20.

IDPD_EQUALIZER_FILTER_LENGTH = 1310723

Specifies the length of the equalizer filter to be trained.

This attribute is applicable when you set EQUALIZER_MODE to Train.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 101. Valid values are 1 to 4096, inclusive.

IDPD_EQUALIZER_MODE = 1310722

Specifies whether to enable equalization.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is OFF.

Name (Value)	Description
Off (0)	Equalization filter is not applied.
Train (1)	Train Equalization filter. The filter length is obtained from the IDPD Equalizer Filter Length attribute.
Hold (2)	The RFmxSpecAn IDPD Configure Equalizer Coefficients method specifies the filter that acts as the equalization filter. This filter is applied prior to calculating the predistorted waveform.

IDPD_EVM_ENABLED = 1310739

Specifies whether to enable EVM computation.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables EVM computation. NaN is returned for Mean RMS EVM.
True (1)	Enables EVM computation.

IDPD_EVM_UNIT = 1310740

Specifies the units of the EVM results.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Percentage.

Name (Value)	Description
Percentage (0)	EVM is expressed as a percentage.
dB (1)	EVM is expressed in dB.

IDPD_GAIN_EXPANSION = 1310745

Specifies the increase of input power relative to the peak power value of the reference signal. This value is expressed in dB.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 6.

IDPD_IMPAIRMENT_ESTIMATION_START = 1310741

Specifies the start time of the impairment estimation interval relative to the start of the reference waveform. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

IDPD_IMPAIRMENT_ESTIMATION_STOP = 1310742

Specifies the stop time of the impairment estimation interval relative to the start of the reference waveform. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

IDPD_MEASUREMENT_ENABLED = 1310720

Specifies whether to enable IDPD measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

IDPD_MEASUREMENT_SAMPLE_RATE = 1310725

Specifies the acquisition sample rate, in S/s, when you set the MEASUREMENT_SAMPLE_RATE_MODE is User. Users should read back the actual sample rate used by the measurement. Actual sample rate may differ from requested sample rate in order to ensure a waveform is phase continuous.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 120000000.

IDPD_MEASUREMENT_SAMPLE_RATE_MODE = 1310724

Specifies acquisition sample rate configuration mode.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Reference Waveform.

Name (Value)	Description
User (0)	Acquisition sample rate is defined by the IDPD Meas Sample Rate (S/s) attribute.
Reference Waveform (1)	Acquisition sample rate is set to match the sample rate of the reference waveform.

IDPD_NUMBER_OF_ANALYSIS_THREADS = 1310753

Specifies the maximum number of threads used for parallelism for the IDPD measurement.

The number of threads can range from 1 to the number of physical cores. However, the number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

IDPD_POWER_LINEARITY_TRADEOFF = 1310747

Specifies the gain tradeoff factor that sets the gain expected from the DUT after applying IDPD on the input waveform. This value is expressed as a percentage.

The percentages zero corresponds to the gain at maximum linearity, hundred corresponds to the gain at maximum power, and fifty corresponds to the gain at average power output from the DUT.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 50.

IDPD_REFERENCE_WAVEFORM_IDLE_DURATION_PRESENT = 1310731

Specifies whether the reference waveform contains idle duration or dead time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Reference waveform has no idle duration.
True (1)	Reference waveform contains idle duration.

IDPD_RESULTS_GAIN = 1310749

Returns the gain of the device under test. This value is expressed in dB.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

IDPD_RESULTS_MEAN_RMS_EVM = 1310750

Returns the ratio of L2 norm of difference between the normalized reference and acquired waveforms, to the L2 norm of the normalized reference waveform. This value is expressed either as a percentage or in dB depending on the configured EVM_UNIT,

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

IDPD_SIGNAL_TYPE = 1310726

Specifies the type of reference waveform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Modulated.

Name (Value)	Description
Modulated (0)	Specifies the reference waveform is a banded signal like cellular or connectivity standard signals.
Tones (1)	Specifies the reference waveform is a continuous signal comprising of one or more tones.

IDPD_SYNCHRONIZATION_ESTIMATION_START = 1310743

Specifies the start time of the synchronization estimation interval relative to the start of the reference waveform. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

IDPD_SYNCHRONIZATION_ESTIMATION_STOP = 1310744

Specifies the stop time of the synchronization estimation interval relative to the start of the reference waveform. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

IDPD_TARGET_GAIN = 1310759

Specifies the Target gain when the configured pre-distorted waveform is non-empty.

When the configured pre-distorted waveform is empty, this attribute is ignored. It is recommended to use the Gain result from the previous iteration to configure this attribute.

The default value is 20.

IM_ALL_TRACES_ENABLED = 1114140

Specifies whether to enable the traces to be stored and retrieved after performing the IM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

IM_AMPLITUDE_CORRECTION_TYPE = 1114155

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An Individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

IM_AUTO_INTERMODS_SETUP_ENABLED = 1114117

Specifies whether the measurement computes the intermod frequencies or uses user-specified frequencies.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the values that you specify for the IM Lower Intermod Freq and IM Upper Intermod Freq attributes.
True (1)	The measurement computes the intermod frequencies. The maximum number of intermods that you can measure is based on the value of the IM Max Intermod Order attribute.

IM_AVERAGING_COUNT = 1114132

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

IM_AVERAGING_ENABLED = 1114131

Specifies whether to enable averaging for the IM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The IM measurement uses the IM Averaging Count attribute as the number of acquisitions over which the IM measurement is averaged.

IM_AVERAGING_TYPE = 1114134

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for the IM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

IM_FAR_IF_OUTPUT_POWER_OFFSET = 1114139

Specifies the offset by which to adjust the IF output power level for the intermods that are far from the carrier channel to improve the dynamic range of the signal analyzer. This value is expressed in dB. This attribute is used only if you set the MEASUREMENT_METHOD attribute to Dynamic Range and the IF_OUTPUT_POWER_OFFSET_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 20 dB.

IM_FFT_PADDING = 1114136

Specifies the factor by which the time-domain waveform is zero-padded before an FFT. The FFT size is given by the following formula:

FFT size = waveform size * padding

This attribute is used only when the acquisition span is less than the device instantaneous bandwidth.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

IM_FFT_WINDOW = 1114135

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. This windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

IM_FREQUENCY_DEFINITION = 1114114

Specifies whether the tones and intermod frequencies are relative to the RF CENTER_FREQUENCY, or are absolute frequencies.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Relative.

Name (Value)	Description
Relative (0)	The tone and intermod frequencies are relative to the RF center frequency.
Absolute (1)	The tone and intermod frequencies are absolute frequencies. The measurement ignores the RF center frequency.

IM_FUNDAMENTAL_LOWER_TONE_FREQUENCY = 1114115

Specifies the frequency of the tone that has a lower frequency among the two tones in the input signal. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1 MHz.

IM_FUNDAMENTAL_UPPER_TONE_FREQUENCY = 1114116

Specifies the frequency of the tone that has a higher frequency among the two tones in the input signal. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 MHz.

IM_IF_OUTPUT_POWER_OFFSET_AUTO = 1114137

Specifies whether the measurement computes an IF output power level offset for the intermods to maximize the dynamic range of the signal analyzer. This attribute is used only if you set the MEASUREMENT_METHOD attribute to Dynamic Range.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement sets the IF output power level offset using the values of the IM Near IF Output Power Offset and IM Far IF Output Power Offset attributes.
True (1)	The measurement computes an IF output power level offset for the intermods to improve the dynamic range of the IM measurement.

IM_INTERMOD_ENABLED = 1114120

Specifies whether to enable an intermod for the IM measurement. This attribute is not used when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to True.

Use “intermod<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	Disables an intermod for the IM measurement. The results for the disabled intermods are displayed as NaN.
True (1)	Enables an intermod for the IM measurement.

IM_INTERMOD_ORDER = 1114121

Specifies the order of the intermod. This attribute is not used when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to True.

Use “intermod<n>” as the Selector String to configure or read this attribute.

The default value is 3.

IM_INTERMOD_SIDE = 1114122

Specifies whether to measure intermodulation products corresponding to both lower and upper intermod frequencies or either one of them. This attribute is not used when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to True.

Use “intermod<n>” as the Selector String to configure or read this attribute.

The default value is Both.

Name (Value)	Description
Lower (0)	Measures the intermodulation product corresponding to the IM Lower Intermod Freq attribute.
Upper (1)	Measures the intermodulation product corresponding to the IM Upper Intermod Freq attribute.
Both (2)	Measures the intermodulation product corresponding to both IM Lower Intermod Freq and IM Upper Intermod Freq attributes.

IM_LOCAL_PEAK_SEARCH_ENABLED = 1114154

Specifies whether to enable a local peak search around the tone or intermod frequencies to account for small frequency offsets.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement returns the power at the tone and intermod frequencies.
True (1)	The measurement performs a local peak search around the tone and intermod frequencies to return the peak power.

IM_LOWER_INTERMOD_FREQUENCY = 1114123

Specifies the frequency of the lower intermodulation product. This value is expressed in Hz. This attribute is not used when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to True.

Use “intermod<n>” as the Selector String to configure or read this attribute.

The default value is -3 MHz.

IM_MAXIMUM_INTERMOD_ORDER = 1114118

Specifies the order up to which the RFmx driver measures odd order intermodulation products when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to True. The lower and upper intermodulation products are measured for each order.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3.

IM_MEASUREMENT_ENABLED = 1114112

Specifies whether to enable the IM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

IM_MEASUREMENT_METHOD = 1114125

Specifies the method used to perform the IM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Normal.

Name (Value)	Description
Normal (0)	The IM measurement acquires the spectrum using the same signal analyzer settings across frequency bands. Use this method when the fundamental tone separation is not large. Supported devices: PXIe-5644/5645/5646/5840/5841/5842/5860/5830/5831/5832, PXIe-5663/5665/5668.
Dynamic Range (1)	The IM measurement acquires a segmented spectrum using the signal analyzer specific optimizations for different frequency bands. The spectrum is acquired in segments, one per tone or intermod frequency to be measured. The span of each acquired spectral segment is equal to the frequency separation between the two input tones, or 1 MHz, whichever is smaller. Use this method to configure the IM measurement and the signal analyzer for maximum dynamic range instead of measurement speed. Supported devices: PXIe-5665/5668.
Segmented (2)	Similar to the Dynamic Range method, this method also acquires a segmented spectrum, except that signal analyzer is not explicitly configured to provide maximum dynamic range. Use this method when the frequency separation of the two input tones is large and the measurement accuracy can be traded off for measurement speed. Supported devices: PXIe-5644/5645/5646/5840/5841/5842/5860/5830/5831/5832, PXIe-5663/5665/5668.

IM_NEAR_IF_OUTPUT_POWER_OFFSET = 1114138

Specifies the offset by which to adjust the IF output power level for the intermods near the carrier channel to improve the dynamic range of the signal analyzer. This value is expressed in dB. This attribute is used only if you set the MEASUREMENT_METHOD attribute to Dynamic Range and the IF_OUTPUT_POWER_OFFSET_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 dB.

IM_NUMBER_OF_ANALYSIS_THREADS = 1114141

Specifies the maximum number of threads used for parallelism for the IM measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

IM_NUMBER_OF_INTERMODS = 1114119

Specifies the number of intermods to measure when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

IM_RBW_FILTER_AUTO_BANDWIDTH = 1114126

Specifies whether the measurement computes the RBW.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the IM RBW attribute.
True (1)	The measurement computes the RBW.

IM_RBW_FILTER_BANDWIDTH = 1114127

Specifies the bandwidth of the RBW filter used to sweep the acquired signal, when you set the RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 kHz.

IM_RBW_FILTER_TYPE = 1114128

Specifies the response of the digital RBW filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	An RBW filter with a Gaussian response is applied.
Flat (2)	An RBW filter with a flat response is applied.

IM_RESULTS_INTERMOD_ORDER = 1114146

Returns the order of the intermod.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_LOWER_INTERMOD_POWER = 1114148

Returns the peak power measured around the lower intermod frequency when you set the LOCAL_PEAK_SEARCH_ENABLED attribute to True. This value is expressed in dBm. When you set the IM Local Peak Search Enabled attribute to False, the measurement returns the power at the lower intermod frequency.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_LOWER_INTERMOD_RELATIVE_POWER = 1114160

Returns the relative peak power measured around the lower intermod frequency when you set the LOCAL_PEAK_SEARCH_ENABLED attribute to True. This value is expressed in dBc. When you set the IM Local Peak Search Enabled attribute to False, the measurement returns the relative power at the lower intermod frequency.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_LOWER_OUTPUT_INTERCEPT_POWER = 1114151

Returns the lower output intercept power. This value is expressed in dBm. Refer to the IM topic for more information about this result.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_LOWER_TONE_POWER = 1114143

Returns the peak power measured around the lower tone frequency when you set the LOCAL_PEAK_SEARCH_ENABLED attribute to True. This value is expressed in dBm. When you set the IM Local Peak Search Enabled attribute to False, the measurement returns the power at the lower tone frequency.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

IM_RESULTS_UPPER_INTERMOD_POWER = 1114150

Returns the peak power measured around the upper intermod frequency when you set the LOCAL_PEAK_SEARCH_ENABLED attribute to True. This value is expressed in dBm. When you set the IM Local Peak Search Enabled attribute to False, the measurement returns the power at the upper intermod frequency.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_UPPER_INTERMOD_RELATIVE_POWER = 1114161

Returns the relative peak power measured around the upper intermod frequency when you set the LOCAL_PEAK_SEARCH_ENABLED attribute to True. This value is expressed in dBc. When you set the IM Local Peak Search Enabled attribute to False, the measurement returns the relative power at the upper intermod frequency.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_UPPER_OUTPUT_INTERCEPT_POWER = 1114152

Returns the upper output intercept power. This value is expressed in dBm. Refer to the IM topic for more information about this result.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_UPPER_TONE_POWER = 1114145

Returns the peak power measured around the upper tone frequency when you set the LOCAL_PEAK_SEARCH_ENABLED attribute to True. This value is expressed in dBm. When you set the IM Local Peak Search Enabled attribute to False, the measurement returns the power at the upper tone frequency.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

IM_RESULTS_WORST_CASE_INTERMOD_ABSOLUTE_POWER = 1114162

Returns the worst case intermod power that is equal to the maximum of the values of both the UPPER_INTERMOD_POWER and LOWER_INTERMOD_POWER results. This value is expressed in dBm.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_WORST_CASE_INTERMOD_RELATIVE_POWER = 1114163

Returns the worst case intermod relative power that is equal to the maximum of the values of both the UPPER_INTERMOD_RELATIVE_POWER and LOWER_INTERMOD_RELATIVE_POWER results. This value is expressed in dBc.

Use “intermod<n>” as the selector string to read this result.

IM_RESULTS_WORST_CASE_OUTPUT_INTERCEPT_POWER = 1114153

Returns the worst case output intercept power which is equal to the minimum of the values of the UPPER_OUTPUT_INTERCEPT_POWER and LOWER_OUTPUT_INTERCEPT_POWER results. This value is expressed in dBm.

Use “intermod<n>” as the selector string to read this result.

IM_SWEEP_TIME_AUTO = 1114129

Specifies whether the measurement computes the sweep time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the IM Sweep Time attribute.
True (1)	The measurement computes the sweep time based on the value of the IM RBW attribute.

IM_SWEEP_TIME_INTERVAL = 1114130

Specifies the sweep time when you set the SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

IM_UPPER_INTERMOD_FREQUENCY = 1114124

Specifies the frequency of the upper intermodulation product. This value is expressed in Hz. This attribute is not used when you set the AUTO_INTERMODS_SETUP_ENABLED attribute to True.

Use “intermod<n>” as the Selector String to configure or read this attribute.

The default value is 3 MHz.

IQ_ACQUISITION_TIME = 1110276

Specifies the acquisition time for the I/Q measurement. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

IQ_BANDWIDTH = 1110281

Specifies the minimum acquisition bandwidth when you set the BANDWIDTH_AUTO attribute to False. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 MHz.

IQ_BANDWIDTH_AUTO = 1110280

Specifies whether the measurement computes the minimum acquisition bandwidth.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the value of the IQ Bandwidth attribute as the minimum acquisition bandwidth.
True (1)	The measurement uses 0.8 * sample rate as the minimum signal bandwidth.

IQ_DELETE_RECORD_ON_FETCH = 1110282

Specifies whether the measurement deletes the fetched record.

The default value is True.

Name (Value)	Description
False (0)	The measurement does not delete the fetched record.
True (1)	The measurement deletes the fetched record.

IQ_MEASUREMENT_ENABLED = 1110272

Specifies whether to enable the I/Q measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

IQ_MEASUREMENT_MODE = 1110284

Specifies the mode for performing the IQ measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Normal.

Name (Value)	Description
Normal (0)	Performs the measurement in the normal RFmx execution mode and supports all the RFmx features such as overlapped measurements.
RawIQ (1)	Reduces the overhead introduced by this measurement by not copying and storing the data in RFmx. In this mode IQ data needs to be retrieved using RFmxInstr Fetch Raw IQ method instead of RFmxSpecAn IQ Fetch Data method. RFmxInstr Fetch Raw IQ directly fetches the data from the hardware.

IQ_NUMBER_OF_RECORDS = 1110275

Specifies the number of records to acquire.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

IQ_POWER_EDGE_TRIGGER_LEVEL = 1048584

Specifies the power level at which the device triggers. This value is expressed in dB when you set the IQ_POWER_EDGE_TRIGGER_LEVEL_TYPE attribute to Relative and is expressed in dBm when you set the IQ Power Edge Level Type attribute to Absolute. The device asserts the trigger when the signal exceeds the level specified by the value of this attribute, taking into consideration the specified slope. This attribute is used only when you set the TRIGGER_TYPE attribute to IQ Power Edge.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default of this attribute is hardware dependent.

IQ_POWER_EDGE_TRIGGER_LEVEL_TYPE = 1052671

Specifies the reference for the IQ_POWER_EDGE_TRIGGER_LEVEL attribute. The IQ Power Edge Level Type attribute is used only when you set the TRIGGER_TYPE attribute to IQ Power Edge.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Absolute.

Name (Value)	Description
Relative (0)	The IQ Power Edge Level attribute is relative to the value of the Reference Level attribute.
Absolute (1)	The IQ Power Edge Level attribute specifies the absolute power.

IQ_POWER_EDGE_TRIGGER_SLOPE = 1048585

Specifies whether the device asserts the trigger when the signal power is rising or when it is falling. The device asserts the trigger when the signal power exceeds the specified level with the slope you specify. This attribute is used only when you set the TRIGGER_TYPE attribute to IQ Power Edge.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Rising Slope.

Name (Value)	Description
Rising Slope (0)	The trigger asserts when the signal power is rising.
Falling Slope (1)	The trigger asserts when the signal power is falling.

IQ_POWER_EDGE_TRIGGER_SOURCE = 1048583

Specifies the channel from which the device monitors the trigger. This attribute is used only when you set the TRIGGER_TYPE attribute to IQ Power Edge.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default of this attribute is hardware dependent.

IQ_PRETRIGGER_TIME = 1110277

Specifies the pretrigger time for the I/Q measurement. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

IQ_SAMPLE_RATE = 1110274

Specifies the acquisition sample rate. This value is expressed in samples per second (S/s).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 50 MS/s.

LIMITED_CONFIGURATION_CHANGE = 1048590

Specifies the set of attributes that are considered by RFmx in the locked signal configuration state.

If your test system performs the same measurement at different selected ports, multiple frequencies and/or power levels repeatedly, enabling this attribute will help achieve faster measurements. When you set this attribute to a value other than Disabled, the RFmx driver will use an optimized code path and skip some checks. Because RFmx skips some checks when you use this attribute, you need to be aware of the limitations of this feature, which are listed in the limitations topic.

You can also use this attribute to lock a specific instrument configuration for a signal so that every time that you initiate the signal, RFmx applies the RFmxInstr attributes from a locked configuration.

NI recommends you use this attribute in conjunction with named signal configurations. Create named signal configurations for each measurement configuration in your test program and set this attribute to a value other than Disabled for one or more of the named signal configurations. This allows RFmx to precompute the acquisition settings for your measurement configurations and re-use the precomputed settings each time you initiate the measurement. You do not need to use this attribute if you create named signals for all the measurement configurations in your test program during test sequence initialization and do not change any RFInstr or personality attributes while testing each device under test. RFmx automatically optimizes that use case.

Specify the named signal configuration you are setting this attribute in the selector string input. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Disabled.

Name (Value)	Description
Disabled (0)	This is the normal mode of RFmx operation. All configuration changes in RFmxInstr attributes or in personality attributes will be applied during RFmx Commit.
No Change (1)	Signal configuration and RFmxInstr configuration are locked after the first Commit or Initiate of the named signal configuration. Any configuration change thereafter either in RFmxInstr attributes or personality attributes will not be considered by subsequent RFmx Commits or Initiates of this signal. Use No Change if you have created named signal configurations for all measurement configurations but are setting some RFmxInstr attributes. Refer to the Limitations of the Limited Configuration Change Property topic for more details about the limitations of using this mode.
Frequency (2)	Signal configuration, other than center frequency, external attenuation, and RFInstr configuration, is locked after first Commit or Initiate of the named signal configuration. Thereafter, only the Center Frequency and External Attenuation attribute value changes will be considered by subsequent driver Commits or Initiates of this signal. Refer to the Limitations of the Limited Configuration Change Property topic for more details about the limitations of using this mode.
Reference Level (3)	Signal configuration, other than the reference level and RFInstr configuration, is locked after first Commit or Initiate of the named signal configuration. Thereafter only the Reference Level attribute value change will be considered by subsequent driver Commits or Initiates of this signal. If you have configured this signal to use an IQ Power Edge Trigger, NI recommends that you set the IQ Power Edge Level Type to Relative so that the trigger level is automatically adjusted as you adjust the reference level. Refer to the Limitations of the Limited Configuration Change Property topic for more details about the limitations of using this mode.
Freq and Ref Level (4)	Signal configuration, other than center frequency, reference level, external attenuation, and RFInstr configuration, is locked after first Commit or Initiate of the named signal configuration. Thereafter only Center Frequency, Reference Level, and External Attenuation attribute value changes will be considered by subsequent driver Commits or Initiates of this signal. If you have configured this signal to use an IQ Power Edge Trigger, NI recommends you set the IQ Power Edge Level Type to Relative so that the trigger level is automatically adjusted as you adjust the reference level. Refer to the Limitations of the Limited Configuration Change Property topic for more details about the limitations of using this mode.
Selected Ports, Freq and Ref Level (5)	Signal configuration, other than Selected Ports, Center frequency, Reference level, External attenuation, and RFInstr configuration, is locked after first Commit or Initiate of the named signal configuration. Thereafter only Selected Ports, Center Frequency, Reference Level, and External Attenuation attribute value changes will be considered by subsequent driver Commits or Initiates of this signal. If you have configured this signal to use an IQ Power Edge Trigger, NI recommends you set the IQ Power Edge Level Type to Relative so that the trigger level is automatically adjusted as you adjust the reference level. Refer to the Limitations of the Limited Configuration Change Property topic for more details about the limitations of using this mode.

LIST_STEP_TIMER_DURATION = 1052665

Specifies the duration of a given list step. This value is expressed in seconds.

You need to use a selector string to configure or read this attribute for the list step instance.

The default value is 0.

LIST_STEP_TIMER_OFFSET = 1052663

Specifies the time offset from the start of the step for which the measurements are computed. This value is expressed in seconds. This attribute is valid only when you set the DIGITAL_EDGE_TRIGGER_SOURCE attribute to TimerEvent.

You need to use a selector string to configure or read this attribute for the list step instance.

The default value is 0.

NF_AVERAGING_COUNT = 1179656

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

NF_AVERAGING_ENABLED = 1179655

Specifies whether to enable averaging for the noise figure (NF) measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The NF measurement uses the value of the NF Averaging Count attribute as the number of acquisitions for each frequency which you specify in the NF Freq List attribute, over which the NF measurement is averaged.

NF_CALIBRATION_LOSS = 1179678

Specifies the array of ohmic losses between the noise source and input port of the analyzer during calibration, as a function of frequency. This value is expressed in dB. This loss is accounted for by the noise figure (NF) measurement when you set the CALIBRATION_LOSS_COMPENSATION_ENABLED attribute to True. You must exclude any loss specified by the Y_FACTOR_NOISE_SOURCE_LOSS attribute.

This attribute specifies the frequencies at which the CALIBRATION_LOSS_FREQUENCY attribute measures the losses.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_CALIBRATION_LOSS_COMPENSATION_ENABLED = 1179677

Specifies whether the noise figure (NF) measurement accounts for the ohmic losses between the noise source and input port of the analyzer during the calibration step, excluding any losses which you have specified using the Y_FACTOR_NOISE_SOURCE_LOSS attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The NF measurement ignores the ohmic losses.
True (1)	The NF measurement accounts for the ohmic losses.

NF_CALIBRATION_LOSS_FREQUENCY = 1179679

Specifies an array of frequencies corresponding to the ohmic losses between the source and the input port of the analyzer. This value is expressed in Hz. This attribute is applicable only when you set the Y_FACTOR_MODE attribute to Calibrate and set the MEASUREMENT_METHOD attribute to Y-Factor, or when you set the COLD_SOURCE_MODE attribute to Calibrate and set the NF Meas Method attribute to Cold Source.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_CALIBRATION_LOSS_TEMPERATURE = 1179680

Specifies the physical temperature of the ohmic loss elements specified by the CALIBRATION_LOSS attribute. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 297.

NF_CALIBRATION_SETUP_ID = 1179700

Associates a unique string identifier with the hardware setup used to perform calibration for the NF measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty string.

NF_COLD_SOURCE_DUT_S11 = 1179697

Specifies an array of the input-reflections of the DUT as a function of frequency, when the output port of the DUT is terminated with an impedance equal to the characteristic impedance. This value is expressed in dB.

The corresponding array of frequencies is specified by the COLD_SOURCE_DUT_S_PARAMETERS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_DUT_S12 = 1179696

Specifies an array of the input-isolations of the DUT as a function of frequency, when the input port of the DUT is terminated with an impedance equal to the characteristic impedance. This value is expressed in dB. The corresponding array of frequencies is specified by the COLD_SOURCE_DUT_S_PARAMETERS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_DUT_S21 = 1179695

Specifies an array of the gains of the DUT as a function of frequency, when the output port of the DUT is terminated with an impedance equal to the characteristic impedance. This value is expressed in dB. The corresponding array of frequencies is specified by the COLD_SOURCE_DUT_S_PARAMETERS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_DUT_S22 = 1179698

Specifies an array of the output-reflections of the DUT as a function of frequency, when the input port of the DUT is terminated with an impedance equal to the characteristic impedance. This value is expressed in dB. The corresponding array of frequencies is specified by the COLD_SOURCE_DUT_S_PARAMETERS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_DUT_S_PARAMETERS_FREQUENCY = 1179699

Specifies an array of frequencies corresponding to the s-parameters of the DUT specified by the COLD_SOURCE_DUT_S21, COLD_SOURCE_DUT_S12, COLD_SOURCE_DUT_S11, and COLD_SOURCE_DUT_S22 attributes. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_INPUT_TERMINATION_TEMPERATURE = 1179694

Specifies the physical temperature of the microwave termination used as the noise source in the cold source method. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 297.

NF_COLD_SOURCE_INPUT_TERMINATION_VSWR = 1179692

Specifies an array of voltage standing wave ratios (VSWR) as a function of frequency of the microwave termination used as the noise source in cold source method. The corresponding array of frequencies is specified by the COLD_SOURCE_INPUT_TERMINATION_VSWR_FREQUENCY attribute.

In most cases, the exact VSWR of the microwave termination may not be known. Hence, NI recommends that you set this attribute to an empty array, in which case the noise figure (NF) measurement assumes that the VSWR of the microwave termination is unity for all frequencies.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_INPUT_TERMINATION_VSWR_FREQUENCY = 1179693

Specifies an array of frequencies corresponding to the voltage standing wave ratios (VSWR) of the microwave termination used in the cold source method as specified by the COLD_SOURCE_INPUT_TERMINATION_VSWR attribute. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_COLD_SOURCE_MODE = 1179691

Specifies whether the measurement should calibrate the noise characteristics of the analyzer or compute the noise characteristics of the DUT for the cold source method.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Measure.

Name (Value)	Description
Measure (0)	The noise figure (NF) measurement computes the noise characteristics of the DUT and compensates for the noise figure of the analyzer.
Calibrate (1)	The NF measurement computes the noise characteristics of the analyzer.

NF_DEVICE_TEMPERATURE_TOLERANCE = 1179705

Specifies the tolerance for device temperature beyond which the calibration data is considered invalid. This value is expressed in Celsius.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 5.

NF_DUT_INPUT_LOSS = 1179666

Specifies an array of the ohmic losses between the noise source and the input port of the DUT, as a function of the frequency. This value is expressed in dB. This loss is accounted for by the NF measurement when you set the DUT_INPUT_LOSS_COMPENSATION_ENABLED attribute to True. You must exclude any loss which is inherent to the noise source and is common between the calibration and measurement steps, and configure the loss using the Y_FACTOR_NOISE_SOURCE_LOSS attribute.

Specify the frequencies at which the losses were measured using the DUT_INPUT_LOSS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_DUT_INPUT_LOSS_COMPENSATION_ENABLED = 1179665

Specifies whether the noise figure (NF) measurement accounts for ohmic losses between the noise source and the input port of the DUT, excluding the losses that are common to calibration and the measurement steps for the Y-Factor method, which are specified by the Y_FACTOR_NOISE_SOURCE_LOSS attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The NF measurement ignores the ohmic losses.
True (1)	The NF measurement accounts for the ohmic losses.

NF_DUT_INPUT_LOSS_FREQUENCY = 1179667

Specifies an array of frequencies corresponding to the value of the DUT_INPUT_LOSS attribute. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_DUT_INPUT_LOSS_TEMPERATURE = 1179668

Specifies the physical temperature of the ohmic loss elements considered in the DUT_INPUT_LOSS attribute. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 297.

NF_DUT_OUTPUT_LOSS = 1179670

Specifies the array of ohmic losses between the output port of the DUT and the input port of the analyzer, as a function of frequency. This value is expressed in dB. This loss is accounted for by the noise figure (NF) measurement when you set the DUT_OUTPUT_LOSS_COMPENSATION_ENABLED attribute to True.

Specify the array of frequencies at which the losses were measured using the DUT_OUTPUT_LOSS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_DUT_OUTPUT_LOSS_COMPENSATION_ENABLED = 1179669

Specifies whether the noise figure (NF) measurement accounts for ohmic losses between the output port of the DUT and the input port of the analyzer.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The NF measurement ignores ohmic losses.
True (1)	The NF measurement accounts for the ohmic losses.

NF_DUT_OUTPUT_LOSS_FREQUENCY = 1179671

Specifies the array of frequencies corresponding to the value of the DUT_OUTPUT_LOSS attribute. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_DUT_OUTPUT_LOSS_TEMPERATURE = 1179672

Specifies the physical temperature of the ohmic loss elements specified by the DUT_OUTPUT_LOSS attribute. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 297.

NF_DUT_TYPE = 1179706

Specifies the type of DUT.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Amplifier.

Name (Value)	Description
Amplifier (0)	Specifies that the DUT only amplifies or attenuates the signal, and does not change the frequency.
Downconverter (1)	Specifies that the DUT is a downconverter, that is, the IF frequency is the difference between the LO and RF frequencies.
Upconverter (2)	Specifies that the DUT is an upconverter, that is, the IF frequency is the sum of LO and RF frequencies.

NF_EXTERNAL_PREAMP_FREQUENCY = 1179702

Specifies the array of frequencies corresponding to the value of the EXTERNAL_PREAMP_GAIN attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

NF_EXTERNAL_PREAMP_GAIN = 1179703

Specifies the gain of the external preamp as a function of frequency. The value is expressed in dB.

Specify the frequencies at which gain values were measured using the EXTERNAL_PREAMP_FREQUENCY attribute.

NF_EXTERNAL_PREAMP_PRESENT = 1179701

Specifies if an external preamplifier is present in the signal path.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	No external preamplifier present in the signal path.
True (1)	An external preamplifier present in the signal path.

NF_FREQUENCY_CONVERTER_FREQUENCY_CONTEXT = 1179710

Specifies the context of the FREQUENCY_LIST attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF.

Name (Value)	Description
RF (0)	Specifies that the frequency context is RF.
IF (1)	Specifies that the frequency context is IF.

NF_FREQUENCY_CONVERTER_IMAGE_REJECTION = 1179712

Specifies the gain ratio of the DUT at the image frequency to that at the RF frequency. This value is expressed in dB. Refer to NF concept help for more details.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 999.99 dB.

NF_FREQUENCY_CONVERTER_LO_FREQUENCY = 1179708

Specifies the fixed LO frequency of the DUT when you set the DUT_TYPE attribute to either Downconverter or Upconverter. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 MHz.

NF_FREQUENCY_CONVERTER_SIDEBAND = 1179711

Specifies the sideband when you set the DUT_TYPE attribute to either Downconverter or Upconverter, and the FREQUENCY_CONVERTER_FREQUENCY_CONTEXT attribute to IF.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is LSB.

Name (Value)	Description
LSB (0)	When the frequency context is IF, out of the two possible input frequencies that gets translated to IF, the lower is treated as the RF (signal) frequency while the higher is treated as the image frequency.
USB (1)	When the frequency context is IF, out of the two possible input frequencies that gets translated to IF, the lower is treated as the image frequency while the higher is treated as the RF (signal) frequency.

NF_FREQUENCY_LIST = 1179652

Specifies the list of frequencies at which the noise figure (NF) of the DUT is computed. This value is expressed in Hz.

The default value is an empty array.

NF_MEASUREMENT_BANDWIDTH = 1179653

Specifies the effective noise-bandwidth in which power measurements are performed for the noise figure (NF) measurement. This value is expressed in Hz.

The default value is 100 kHz.

NF_MEASUREMENT_ENABLED = 1179649

Enables the noise figure (NF) measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

NF_MEASUREMENT_INTERVAL = 1179654

Specifies the duration for which the signals are acquired at each frequency which you specify in the FREQUENCY_LIST attribute. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 ms.

NF_MEASUREMENT_METHOD = 1179657

Specifies the measurement method used to perform the noise figure (NF) measurement. Refer to the NF concept topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Y-Factor.

Name (Value)	Description
Y-Factor (0)	The NF measurement computes the noise figure of the DUT using a noise source with a calibrated excess-noise ratio (ENR). Refer to the NF Y-Factor NS Type attribute for information about supported devices and their corresponding noise source type.
Cold Source (1)	The NF measurement computes the noise figure of the DUT using a 50 ohm microwave termination as the noise source. Supported Devices: PXIe-5644/5645/5646/5840/5841/5842/5860, PXIe-5830/5831/5832

NF_NUMBER_OF_ANALYSIS_THREADS = 1179681

Specifies the maximum number of threads used for parallelism for the noise figure (NF) measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

The default value is 1.

NF_RESULTS_ANALYZER_NOISE_FIGURE = 1179685

Returns an array of the noise figures of the analyzer measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_CALIBRATION_Y_FACTOR = 1179687

Returns an array of the calibration Y-Factors measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in dB. A valid result is returned only when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_COLD_SOURCE_POWER = 1179690

Returns the power measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in dBm. A valid result is returned only when you set the MEASUREMENT_METHOD attribute to Cold-source.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_DUT_GAIN = 1179684

Returns an array of the available gains of the DUT measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_DUT_NOISE_FIGURE = 1179682

Returns an array of the noise figures of the DUT measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in dB.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_DUT_NOISE_TEMPERATURE = 1179683

Returns an array of the equivalent thermal noise temperatures of the DUT measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in kelvin.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_MEASUREMENT_Y_FACTOR = 1179686

Returns an array of the measurement Y-Factors measured at the frequencies specified by the FREQUENCY_LIST attribute. This value is expressed in dB. A valid result is returned only when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_Y_FACTOR_COLD_POWER = 1179689

Returns the array of powers measured at the frequencies specified by the FREQUENCY_LIST attribute, when the noise source is disabled. This value is expressed in dBm. A valid result is returned only when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_RESULTS_Y_FACTOR_HOT_POWER = 1179688

Returns the array of powers measured at the frequencies specified by the FREQUENCY_LIST attribute, when the noise source is enabled. This value is expressed in dBm. A valid result is returned only when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

NF_Y_FACTOR_MODE = 1179658

Specifies whether the measurement should calibrate the noise characteristics of the analyzer or compute the noise characteristics of the DUT when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Measure.

Name (Value)	Description
Measure (0)	The noise figure (NF) measurement computes the noise characteristics of the DUT, compensating for the noise figure of the analyzer.
Calibrate (1)	The NF measurement computes the noise characteristics of the analyzer.

NF_Y_FACTOR_NOISE_SOURCE_COLD_TEMPERATURE = 1179662

Specifies the calibrated cold noise temperature of the noise source used in the Y-Factor method. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 302.8.

NF_Y_FACTOR_NOISE_SOURCE_ENR = 1179660

Specifies the array of effective noise ratio (ENR) values of the noise source as a function of the frequency. This value is expressed in dB. The corresponding frequencies are specified by the Y_FACTOR_NOISE_SOURCE_ENR_FREQUENCY attribute. This attribute is used only when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_Y_FACTOR_NOISE_SOURCE_ENR_FREQUENCY = 1179661

Specifies an array of frequencies corresponding to the effective noise ratio (ENR) values specified by the Y_FACTOR_NOISE_SOURCE_ENR attribute. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_Y_FACTOR_NOISE_SOURCE_LOSS = 1179674

Specifies an array of the ohmic losses inherent to the noise source used in the Y-Factor method. This value is expressed in dB. This loss is accounted for by the NF measurement when you set the Y_FACTOR_NOISE_SOURCE_LOSS_COMPENSATION_ENABLED attribute to True.

You must specify the frequencies at which the losses were measured using the Y_FACTOR_NOISE_SOURCE_LOSS_FREQUENCY attribute.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_Y_FACTOR_NOISE_SOURCE_LOSS_COMPENSATION_ENABLED = 1179673

Specifies whether the noise figure (NF) measurement should account for ohmic losses inherent to the noise source used in the Y-Factor method common to the calibration and measurement steps.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Ohmic losses are ignored.
True (1)	Ohmic losses are accounted for in the NF measurement.

NF_Y_FACTOR_NOISE_SOURCE_LOSS_FREQUENCY = 1179675

Specifies the frequencies corresponding to the ohmic loss inherent to the noise source used in the Y-Factor method specified by the Y_FACTOR_NOISE_SOURCE_LOSS attribute. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

NF_Y_FACTOR_NOISE_SOURCE_LOSS_TEMPERATURE = 1179676

Specifies the physical temperature of the ohmic loss elements specified in the Y_FACTOR_NOISE_SOURCE_LOSS attribute. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 297.

NF_Y_FACTOR_NOISE_SOURCE_OFF_TEMPERATURE = 1179663

Specifies the physical temperature of the noise source used in the Y-Factor method when the noise source is turned off. This value is expressed in kelvin.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 297.

NF_Y_FACTOR_NOISE_SOURCE_RF_SIGNAL_GENERATOR_PORT = 1179714

Specifies the vector signal generator port to be configured to generate a noise signal when you set the Y_FACTOR_NOISE_SOURCE_TYPE attribute to RF Signal Generator.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is “” (empty string).

NF_Y_FACTOR_NOISE_SOURCE_SETTLING_TIME = 1179664

Specifies the time to wait till the noise source used in the Y-Factor method settles to either hot or cold state when the noise source is turned on or off. This attribute is used only when you set the Y_FACTOR_NOISE_SOURCE_TYPE attribute to External Noise Source. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

NF_Y_FACTOR_NOISE_SOURCE_TYPE = 1179713

Specifies the noise source type for performing the noise figure (NF) measurement when you set the MEASUREMENT_METHOD attribute to Y-Factor.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is External Noise Source.

Name (Value)	Description
External Noise Source (0)	The NF measurement generates noise using an external noise source, that is controlled either by an internal noise source power supply or an NI Source Measure Unit (SMU). Supported Devices: PXIe-5665 (3.6 GHz), PXIe-5668, PXIe-5644/5645/5646*, PXIe-5840*/5841*/5842*/5860*, PXIe 5830/5831*/5832* *Use an external NI Source Measure Unit (SMU) as the noise source power supply for the Noise Figure measurement. During initialization, specify the SMU resource name using “NoiseSourcePowerSupply” as the specifier within the RFmxSetup string. For example, “RFmxSetup= NoiseSourcePowerSupply:myDCPower[0]” configures RFmx to use channel 0 on myDCPower SMU device for powering the noise source. You should allocate a dedicated SMU channel for RFmx. RFmx supports PXIe-4138, PXIe-4139, and PXIe-4139 (40 W) SMUs.
RF Signal Generator (1)	When you measure Y-Factor based NF using a supported NI vector signal transceiver (VST) instrument, RFmx generates noise using the vector signal generator (VSG) integrated into the same VST. RFmx automatically configures the vector signal generator (VSG) to generate noise at the specified bandwidth and ENR levels that you set using the NF Y-Factor NS ENR Freq and NF Y-Factor NS ENR attributes. Supported Devices: PXIe-5842/5860

NUMBER_OF_STEPS = 1052664

Specifies the number of active steps in a list.

You need to use a selector string to configure or read this attribute for the list instance.

The default value is 0.

OBW_ALL_TRACES_ENABLED = 1073170

Specifies whether to enable the traces to be stored and retrieved after performing the OBW.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

OBW_AMPLITUDE_CORRECTION_TYPE = 1073178

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

OBW_AVERAGING_COUNT = 1073158

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

OBW_AVERAGING_ENABLED = 1073159

Specifies whether to enable averaging for the OBW measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The OBW measurement uses the OBW Averaging Count attribute as the number of acquisitions over which the OBW measurement is averaged.

OBW_AVERAGING_TYPE = 1073161

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for OBW measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

OBW_BANDWIDTH_PERCENTAGE = 1073154

Specifies the percentage of the total power that is contained in the OBW.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 99%.

OBW_FFT_PADDING = 1073163

Specifies the factor by which the time-domain waveform is zero-padded before fast Fourier transform (FFT). The FFT size is given by the following formula:

waveform size * padding

This attribute is used only when the acquisition span is less than the device instantaneous bandwidth of the device.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

OBW_FFT_WINDOW = 1073162

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

OBW_MEASUREMENT_ENABLED = 1073152

Specifies whether to enable OBW measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

OBW_NUMBER_OF_ANALYSIS_THREADS = 1073155

Specifies the maximum number of threads used for parallelism for the OBW measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

OBW_POWER_UNITS = 1073176

Specifies the units for the absolute power.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is dBm.

Name (Value)	Description
dBm (0)	The absolute powers are reported in dBm.
dBm/Hz (1)	The absolute powers are reported in dBm/Hz.

OBW_RBW_FILTER_AUTO_BANDWIDTH = 1073164

Specifies whether the measurement computes the resolution bandwidth (RBW).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the OBW RBW attribute.
True (1)	The measurement computes the RBW.

OBW_RBW_FILTER_BANDWIDTH = 1073165

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired signal, when you set the RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 kHz.

OBW_RBW_FILTER_BANDWIDTH_DEFINITION = 1073177

Specifies the bandwidth definition that you use to specify the value of the RBW_FILTER_BANDWIDTH attribute.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3 dB bandwidth of the RBW filter. When you set the OBW RBW Filter Type attribute to FFT Based, RBW is the 3 dB bandwidth of the window specified by the OBW FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the spectrum bin width computed using an FFT when you set the OBW RBW Filter Type attribute to FFT Based.

OBW_RBW_FILTER_TYPE = 1073166

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.

OBW_RESULTS_AVERAGE_POWER = 1073172

Returns the total integrated power, in dBm, of the averaged spectrum acquired by the OBW measurement when you set the POWER_UNITS attribute to dBm. The OBW Results Avg Pwr attribute returns the power spectral density, in dBm/Hz, when you set the OBW Power Units attribute to dBm/Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

OBW_RESULTS_FREQUENCY_RESOLUTION = 1073175

Returns the frequency bin spacing of the spectrum acquired by the OBW measurement. This value is expressed in Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

OBW_RESULTS_OCCUPIED_BANDWIDTH = 1073171

Returns the bandwidth that occupies the percentage of the total power of the signal that you specify in the BANDWIDTH_PERCENTAGE attribute. This value is expressed in Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

OBW_RESULTS_START_FREQUENCY = 1073173

Returns the start frequency of the OBW. This value is expressed in Hz.

The OBW is calculated using the following formula: OBW = stop frequency - start frequency

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

OBW_RESULTS_STOP_FREQUENCY = 1073174

Returns the stop frequency of the OBW. This value is expressed in Hz.

The OBW is calculated using the following formula: OBW = stop frequency - start frequency

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

OBW_SPAN = 1073156

Specifies the frequency range around the center frequency, to acquire for the measurement. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 MHz.

OBW_SWEEP_TIME_AUTO = 1073167

Specifies whether the measurement computes the sweep time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the OBW Sweep Time attribute.
True (1)	The measurement calculates the sweep time based on the value of the OBW RBW attribute.

OBW_SWEEP_TIME_INTERVAL = 1073168

Specifies the sweep time when you set the SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

PAVT_ALL_TRACES_ENABLED = 1077255

Specifies whether to enable the traces to be stored and retrieved after performing the PAVT measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

PAVT_FREQUENCY_OFFSET_CORRECTION_ENABLED = 1077260

Specifies whether to enable frequency offset correction for the measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables the frequency offset correction.
True (1)	Enables the frequency offset correction. The measurement computes and corrects any frequency offset between the reference and the acquired waveforms.

PAVT_FREQUENCY_TRACKING_ENABLED = 1077270

Specifies whether to enable frequency offset correction per segment for the measurement. While you set this attribute to True, ensure that the FREQUENCY_OFFSET_CORRECTION_ENABLED attribute is set to True and the SEGMENT_TYPE attribute is set to Phase and Amplitude.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables the drift correction for the measurement.
True (1)	Enables the drift correction. The measurement corrects and reports the frequency offset per segment.

PAVT_MEASUREMENT_BANDWIDTH = 1077261

Specifies the bandwidth over which the signal is measured. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 MHz.

PAVT_MEASUREMENT_ENABLED = 1077248

Specifies whether to enable the Phase Amplitude Versus Time (PAVT) measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

PAVT_MEASUREMENT_INTERVAL_MODE = 1077269

Specifies the mode of configuring the measurement interval.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Uniform.

Name (Value)	Description
Uniform (0)	The time offset from the start of segment and the duration over which the measurement is performed is uniform for all segments and is given by the PAVT Meas Offset attribute and the PAVT Meas Length attribute respectively.
Variable (1)	The time offset from the start of segment and the duration over which the measurement is performed is configured separately for each segment and is given by the PAVT Segment Meas Offset attribute and the PAVT Segment Meas Length attribute respectively.

PAVT_MEASUREMENT_LENGTH = 1077254

Specifies the duration within the segment over which the phase and amplitude, amplitude, or frequency error values are computed. This value is expressed in seconds. This attribute is valid only when you set the MEASUREMENT_INTERVAL_MODE attribute to Uniform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 millisecond.

PAVT_MEASUREMENT_LOCATION_TYPE = 1077250

Specifies whether the location at which the segment is measured is indicated by time or trigger.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Time.

Name (Value)	Description
Time (0)	The measurement is performed over a single record across multiple segments separated in time. The measurement locations of the segments are specified by the PAVT Segment Start Time attribute. The number of segments is equal to the number of segment start times.
Trigger (1)	The measurement is performed across segments obtained in multiple records, where each record is obtained when a trigger is received. The number of segments is equal to the number of triggers (records).

PAVT_MEASUREMENT_OFFSET = 1077253

Specifies the time offset from the start of the segment for which the phase and amplitude, amplitude, or frequency error values are computed. This value is expressed in seconds. This attribute is valid only when you set the MEASUREMENT_INTERVAL_MODE attribute to Uniform.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

PAVT_NUMBER_OF_SEGMENTS = 1077251

Specifies the number of segments to be measured.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

PAVT_PHASE_UNWRAP_ENABLED = 1077267

Specifies whether the phase measurement results are unwrapped or wrapped.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Phase measurement results are wrapped within +/-180 degrees.
True (1)	Phase measurement results are unwrapped.

PAVT_RESULTS_FREQUENCY_ERROR_MEAN = 1077268

Returns the mean frequency error of the segment. This value is expressed in Hz

Use “segment<n>” as the Selector String to read this result.

PAVT_RESULTS_MEAN_ABSOLUTE_AMPLITUDE = 1077262

Returns the mean absolute amplitude of the segment. This value is expressed in dBm.

Use “segment<n>” as the Selector String to read this result.

PAVT_RESULTS_MEAN_ABSOLUTE_PHASE = 1077263

Returns the mean absolute phase of the segment. This value is expressed in degrees.

Use “segment<n>” as the Selector String to read this result.

PAVT_RESULTS_MEAN_RELATIVE_AMPLITUDE = 1077259

Returns the mean amplitude of the segment, relative to the amplitude of the reference segment. This value is expressed in dB.

Mean Relative Amplitude = a_i- a_r

a_iis the absolute amplitude of the segment i, expressed in dBm

a_ris the absolute amplitude of the reference segment r, expressed in dBm

where, r = 1, if Segment0 is configured as Frequency Error Measurement segment r = 0, otherwise

Use “segment<n>” as the Selector String to read this result.

PAVT_RESULTS_MEAN_RELATIVE_PHASE = 1077258

Returns the mean phase of the segment, relative to the phase of the reference segment. This value is expressed in degrees.

Mean Relative Phase = Q_i- Q_r

Q_iis the absolute phase of the segment i, expressed in degrees

Q_ris the absolute phase of the reference segment r, expressed in degrees

where, r = 1, if Segment0 is configured as Frequency Error Measurement segment r = 0, otherwise

Use “segment<n>” as the Selector String to read this result.

PAVT_SEGMENT_MEASUREMENT_LENGTH = 1077266

Specifies the duration within each segment over which the phase and amplitude, amplitude, or frequency error values are computed. This value is expressed in seconds. This attribute is valid when you set the MEASUREMENT_INTERVAL_MODE attribute to Variable.

Use “segment<n>” as the Selector String to configure or read this attribute.

The default value is 1 millisecond.

PAVT_SEGMENT_MEASUREMENT_OFFSET = 1077265

Specifies the time offset from the start of the segment for which the phase and amplitude, amplitude, or frequency error values are computed. This value is expressed in seconds. This attribute is valid only when you set the MEASUREMENT_INTERVAL_MODE attribute to Variable.

Use “segment<n>” as the Selector String to configure or read this attribute.

The default value is 0.

PAVT_SEGMENT_START_TIME = 1077252

Specifies the start time of measurement of the segments. This value is expressed in seconds. You can use this attribute only when you set the MEASUREMENT_LOCATION_TYPE attribute to Time.

Use “segment<n>” as the Selector String to configure or read this attribute.

The default value is 0.

PAVT_SEGMENT_TYPE = 1077264

Specifies the type of segment.

Use “segment<n>” as the Selector String to configure or read this attribute.

The default value is Phase and Amplitude.

Name (Value)	Description
Phase and Amplitude (0)	Phase and amplitude is measured in this segment.
Amplitude (1)	Amplitude is measured in this segment.
Frequency Error Measurement (2)	Frequency error is measured in this segment.

PHASENOISE_ALL_TRACES_ENABLED = 1245203

Specifies whether to enable the traces to be stored and retrieved after performing the Phase Noise measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

PHASENOISE_AVERAGING_MULTIPLIER = 1245190

Specifies the factor by which you increase the averaging count for each range. This setting applies to both Auto and Manual range definitions.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

PHASENOISE_CANCELLATION_ENABLED = 1245215

Specifies whether to enable or disable the phase noise cancellation.

Refer to the Phase Noise topic for more information on phase noise cancellation.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables phase noise cancellation.
True (1)	Enables phase noise cancellation.

PHASENOISE_CANCELLATION_FREQUENCY = 1245217

Specifies an array of frequencies where the reference phase noise has been measured.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_CANCELLATION_REFERENCE_PHASE_NOISE = 1245218

Specifies an array of reference phase noise at the frequencies specified by the CANCELLATION_FREQUENCY attribute .

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_CANCELLATION_THRESHOLD = 1245216

Specifies the minimum difference between the reference and pre-cancellation traces that must exist before cancellation is performed.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.01.

PHASENOISE_FFT_WINDOW = 1245191

Specifies the FFT window to use.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Hamming.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

PHASENOISE_INTEGRATED_NOISE_RANGE_DEFINITION = 1245200

Specifies the frequency range for integrated noise measurements.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is ** Measurement**.

Name (Value)	Description
None (0)	Integrated noise measurement is not computed.
Measurement (1)	The complete log plot frequency range, considered as a single range, is used for computing integrated measurements.
Custom (2)	The measurement range(s) specified by PhaseNoise Integrated Noise Start Freq attribute and the PhaseNoise Integrated Noise Stop Freq attribute is used for computing integrated measurements.

PHASENOISE_INTEGRATED_NOISE_START_FREQUENCY = 1245201

Specifies an array of the start frequencies for integrated noise measurement when you set the INTEGRATED_NOISE_RANGE_DEFINITION attribute to Custom.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_INTEGRATED_NOISE_STOP_FREQUENCY = 1245202

Specifies an array of the stop frequencies for integrated noise measurement when you set the INTEGRATED_NOISE_RANGE_DEFINITION attribute to Custom.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_MEASUREMENT_ENABLED = 1245184

Specifies whether to enable the phase noise measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

PHASENOISE_NUMBER_OF_RANGES = 1245192

Specifies the number of manual ranges.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

PHASENOISE_RANGE_AVERAGING_COUNT = 1245196

Specifies the averaging count for the specified subrange when you set the RANGE_DEFINITION attribute to Manual.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 10.

PHASENOISE_RANGE_DEFINITION = 1245186

Specifies how the measurement computes offset subranges.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Auto.

Name (Value)	Description
Manual (0)	Specify the offset sub-ranges used for the measurement. Use the PhaseNoise Range Start Freq attribute and the PhaseNoise Range Stop Freq attribute to configure single or multiple range start and range stop frequencies.
Auto (1)	Measurement computes offset sub-ranges by dividing the user configured offset range into multiple decade sub-ranges. The range is specified by the PhaseNoise Start Freq and the PhaseNoise Stop Freq attributes.

PHASENOISE_RANGE_RBW_PERCENTAGE = 1245195

Specifies the RBW as a percentage of the RANGE_START_FREQUENCY attribute of the specified subrange when you set the RANGE_DEFINITION attribute to Manual.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 10.

PHASENOISE_RANGE_START_FREQUENCY = 1245193

Specifies the start frequency for the specified subrange when you set the RANGE_DEFINITION attribute to Manual.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 1000.

PHASENOISE_RANGE_STOP_FREQUENCY = 1245194

Specifies the stop frequency for the specified subrange when you set the RANGE_DEFINITION attribute to Manual.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 1E+06.

PHASENOISE_RBW_PERCENTAGE = 1245189

Specifies the RBW as a percentage of the start frequency of each subrange when you set the RANGE_DEFINITION attribute to Auto.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

PHASENOISE_RESULTS_CARRIER_FREQUENCY = 1245206

Returns the measured carrier frequency.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_CARRIER_POWER = 1245205

Returns the measured carrier power.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_INTEGRATED_NOISE_JITTER = 1245212

Returns the jitter in seconds.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_INTEGRATED_NOISE_RESIDUAL_FM = 1245211

Returns the residual FM in Hz.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_INTEGRATED_NOISE_RESIDUAL_PM_IN_DEGREE = 1245210

Returns the residual PM in degrees.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_INTEGRATED_NOISE_RESIDUAL_PM_IN_RADIAN = 1245209

Returns the residual PM in radians.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_INTEGRATED_PHASE_NOISE = 1245208

Returns the integrated phase noise.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_RESULTS_SPOT_PHASE_NOISE = 1245207

Returns the phase noise corresponding to the SPOT_NOISE_FREQUENCY_LIST attribute by using the smoothed log plot trace.

You do not need to use a selector string to read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_SMOOTHING_PERCENTAGE = 1245198

Specifies the number of trace points to use in the moving average filter as a percentage of total number of points in the log plot trace.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 2.

PHASENOISE_SMOOTHING_TYPE = 1245197

Specifies the smoothing type used to smoothen the measured log plot trace.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Logarithmic.

Name (Value)	Description
None (0)	Smoothing is disabled.
Linear (1)	Performs linear moving average filtering on the measured phase noise log plot trace.
Logarithmic (2)	Performs logarithmic moving average filtering on the measured phase noise log plot trace.
Median (3)	Performs moving median filtering on the measured phase noise log plot trace.

PHASENOISE_SPOT_NOISE_FREQUENCY_LIST = 1245199

Specifies an array of offset frequencies at which the phase noise is measured using the smoothed log plot trace.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

PHASENOISE_SPUR_REMOVAL_ENABLED = 1245213

Specifies whether to remove spurs from the log plot trace.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	Disables spur removal on the log plot trace.
True (1)	Enables spur removal on the log plot trace.

PHASENOISE_SPUR_REMOVAL_PEAK_EXCURSION = 1245214

Specifies the peak excursion to be used when spur detection is performed.

Refer to the Phase Noise topic for more information on spur removal.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 6.

PHASENOISE_START_FREQUENCY = 1245187

Specifies the start frequency of the offset frequency range when you set the RANGE_DEFINITION attribute to Auto.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1000.

PHASENOISE_STOP_FREQUENCY = 1245188

Specifies the stop frequency of the offset frequency range when you set the RANGE_DEFINITION attribute to Auto.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1E+06.

POWERLIST_MEASUREMENT_ENABLED = 1376256

Specifies whether to enable the PowerList measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

POWERLIST_NUMBER_OF_SEGMENTS = 1376258

Specifies the number of segments to be measured.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

POWERLIST_RESULTS_MAXIMUM_POWER = 1376269

Returns an array of maximum power of the signal, each corresponding to a segment. This value is expressed in dBm.

You do not need to use a selector string to read this result for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

POWERLIST_RESULTS_MEAN_ABSOLUTE_POWER = 1376268

Returns an array of mean absolute power of the signal, each corresponding to a segment. This value is expressed in dBm.

You do not need to use a selector string to read this result for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

POWERLIST_RESULTS_MINIMUM_POWER = 1376270

Returns an array of minimum power of the signal, each corresponding to a segment. This value is expressed in dBm.

You do not need to use a selector string to read this result for the default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

POWERLIST_SEGMENT_FREQUENCY = 1376260

Specifies an array of expected carrier frequencies for the RF signal to be acquired, each corresponding to a segment, to which the signal analyzer tunes. This value is expressed in Hz.

RFmx returns an error if this attribute is not configured or if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

POWERLIST_SEGMENT_LENGTH = 1376259

Specifies an array of durations, each corresponding to a segment, where each value must be at least the sum of SEGMENT_MEASUREMENT_LENGTH and SEGMENT_MEASUREMENT_OFFSET when the DIGITAL_EDGE_TRIGGER_SOURCE attribute is set to TimerEvent. This value is expressed in seconds.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

POWERLIST_SEGMENT_MEASUREMENT_LENGTH = 1376262

Specifies an array of durations, each corresponding to a segment, over which the power value is computed. This value is expressed in seconds.

RFmx returns an error if this attribute is not configured or if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

POWERLIST_SEGMENT_MEASUREMENT_OFFSET = 1376263

Specifies an array of time offsets from the start of each segment, over which the power value is computed. This value is expressed in seconds.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

POWERLIST_SEGMENT_RBW_FILTER_ALPHA = 1376266

Specifies an array of roll-off factor for the root-raised-cosine (RRC) filter, each corresponding to a segment.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.1. RFmx applies this default value for all segments when the attribute is either unconfigured or reset to its default.

POWERLIST_SEGMENT_RBW_FILTER_BANDWIDTH = 1376264

Specifies an array of bandwidth of the resolution bandwidth (RBW) filters used to measure the signal corresponding to each segment. This value is expressed in Hz.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100 kHz. RFmx applies this default value for all segments when the attribute is either unconfigured or reset to its default.

POWERLIST_SEGMENT_RBW_FILTER_TYPE = 1376265

Specifies an array of digital resolution bandwidth (RBW) filter shapes, each corresponding to a segment.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

Name (value)	Description
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.
None (5)	The measurement does not use any RBW filtering.
RRC (6)	The RRC filter with the roll-off specified by the SEGMENT_RBW_FILTER_ALPHA attribute is used as the RBW filter.

The default value is Gaussian. RFmx applies this default value for all segments when the attribute is either unconfigured or reset to its default.

POWERLIST_SEGMENT_REFERENCE_LEVEL = 1376261

Specifies an array of reference levels, each representing the maximum expected power of the RF input signal for its corresponding segment. This value is configured in dBm for RF devices.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is an empty array.

POWERLIST_SEGMENT_TRIGGER_TYPE = 1376267

Specifies an array of trigger type, each corresponding to a segment.

RFmx returns an error if the size of the configured values is smaller than the NUMBER_OF_SEGMENTS. You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

Name (value)	Description
None (0)	No Reference Trigger is configured.
Digital Edge (1)	The Reference Trigger is not asserted until a digital edge is detected. The source of the digital edge is specified using the DIGITAL_EDGE_TRIGGER_SOURCE attribute.
IQ Power Edge (2)	The Reference Trigger is asserted when the signal changes past the level specified by the slope (rising or falling), which is configured using the the IQ_POWER_EDGE_TRIGGER_SLOPE attribute.

The default value is None. RFmx applies this default value for all segments when the attribute is either unconfigured or reset to its default.

REFERENCE_LEVEL = 1048578

Specifies the reference level which represents the maximum expected power of the RF input signal. This value is configured in dBm for RF devices and as V_pk-pkfor baseband devices.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default of this attribute is hardware dependent.

REFERENCE_LEVEL_HEADROOM = 1052668

Specifies the margin RFmx adds to the REFERENCE_LEVEL attribute. The margin avoids clipping and overflow warnings if the input signal exceeds the configured reference level.

RFmx configures the input gain to avoid clipping and associated overflow warnings provided the instantaneous power of the input signal remains within the Reference Level plus the Reference Level Headroom. If you know the input power of the signal precisely or previously included the margin in the Reference Level, you could improve the signal-to-noise ratio by reducing the Reference Level Headroom.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

**Supported devices: **PXIe-5668, PXIe-5830/5831/5832/5840/5841/5842/5860.

Default values

Name (value)	Description
PXIe-5668	6 dB
PXIe-5830/5831/5832/5841/5842/5860	1 dB
PXIe-5840	0 dB

RESULT_FETCH_TIMEOUT = 1097728

Specifies the time, in seconds, to wait before results are available in the RFmxSpecAn Attribute. Set this value to a time longer than expected for fetching the measurement. A value of -1 specifies that the RFmxSpecAn Attribute waits until the measurement is complete.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

SELECTED_PATH = 1048591

SELECTED_PORTS = 1052669

Specifies the instrument port to be configured to acquire a signal. Use nirfmxinstr.session.Session.get_available_ports() method to get the valid port names.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

Valid values

Name (value)	Description
PXIe-5830	if0, if1
PXIe-5831/5832	if0, if1, rf<0-1>/port<x>, where 0-1 indicates one (0) or two (1) mmRH-5582 connections and x is the port number on the mmRH-5582 front panel
Other devices	“” (empty string)

Default values

Name (value)	Description
PXIe-5830/5831/5832	if1
Other devices	“” (empty string)

SEM_ALL_TRACES_ENABLED = 1081383

Specifies whether to enable the traces to be stored and retrieved after performing the SEM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

SEM_AMPLITUDE_CORRECTION_TYPE = 1081423

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

SEM_AVERAGING_COUNT = 1081374

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

SEM_AVERAGING_ENABLED = 1081375

Specifies whether to enable averaging for the SEM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The SEM measurement uses the SEM Averaging Count attribute as the number of acquisitions over which the SEM measurement is averaged.

SEM_AVERAGING_TYPE = 1081377

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for SEM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

SEM_CARRIER_CHANNEL_BANDWIDTH = 1081419

Specifies the channel bandwidth of the carrier. This parameter is used to calculate the values of the OFFSET_START_FREQUENCY and OFFSET_STOP_FREQUENCY attributes when you set the OFFSET_FREQUENCY_DEFINITION attribute to Carrier Edge to Meas BW Center or Carrier Edge to Meas BW Edge.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 2 MHz.

SEM_CARRIER_ENABLED = 1081347

Specifies whether to consider the carrier power as part of the total carrier power measurement.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	The carrier power is not considered as part of the total carrier power.
True (1)	The carrier power is considered as part of the total carrier power.

SEM_CARRIER_FREQUENCY = 1081348

Specifies the center frequency of the carrier, relative to the RF CENTER_FREQUENCY. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.

SEM_CARRIER_INTEGRATION_BANDWIDTH = 1081349

Specifies the frequency range over which the measurement integrates the carrier power. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 2 MHz.

SEM_CARRIER_RBW_FILTER_AUTO_BANDWIDTH = 1081350

Specifies whether the measurement computes the resolution bandwidth (RBW) of the carrier.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the SEM Carrier RBW attribute.
True (1)	The measurement computes the RBW.

SEM_CARRIER_RBW_FILTER_BANDWIDTH = 1081351

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired carrier signal, when you set the CARRIER_RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 10 kHz.

SEM_CARRIER_RBW_FILTER_BANDWIDTH_DEFINITION = 1081422

Specifies the bandwidth definition that you use to specify the value of the CARRIER_RBW_FILTER_BANDWIDTH attribute.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3 dB bandwidth of the RBW filter. When you set the SEM Carrier RBW Filter Type attribute to FFT Based, RBW is the 3 dB bandwidth of the window specified by the SEM FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the spectrum bin width computed using an FFT when you set the SEM Carrier RBW Filter Type attribute to FFT Based.

SEM_CARRIER_RBW_FILTER_TYPE = 1081352

Specifies the shape of the digital resolution bandwidth (RBW) filter.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.

SEM_CARRIER_RRC_FILTER_ALPHA = 1081354

Specifies the roll-off factor for the root-raised-cosine (RRC) filter to apply on the acquired carrier channel before measuring the carrier channel power.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is 0.1.

SEM_CARRIER_RRC_FILTER_ENABLED = 1081353

Specifies whether to apply the root-raised-cosine (RRC) filter on the acquired carrier channel before measuring the carrier channel power.

Use “carrier<n>” as the Selector String to configure or read this attribute.

The default value is False.

Name (Value)	Description
False (0)	The channel power of the acquired carrier channel is measured directly.
True (1)	The measurement applies the RRC filter on the acquired carrier channel before measuring the carrier channel power.

SEM_FFT_PADDING = 1081379

Specifies the factor by which the time-domain waveform is zero-padded before FFT. The FFT size is given by the following formula:

waveform size * padding

This attribute is used only when the acquisition span is less than the device instantaneous bandwidth of the device.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

SEM_FFT_WINDOW = 1081378

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

SEM_MEASUREMENT_ENABLED = 1081344

Specifies whether to enable the SEM measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

SEM_NUMBER_OF_ANALYSIS_THREADS = 1081373

Specifies the maximum number of threads used for parallelism for SEM measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

SEM_NUMBER_OF_CARRIERS = 1081346

Specifies the number of carriers.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

SEM_NUMBER_OF_OFFSETS = 1081355

Specifies the number of offset segments.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

SEM_OFFSET_ABSOLUTE_LIMIT_MODE = 1081359

Specifies whether the absolute limit mask is a flat line or a line with a slope.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Couple.

Name (Value)	Description
Manual (0)	The line specified by the SEM Offset Abs Limit Start and SEM Offset Abs Limit Stop attribute values as the two ends is considered as the mask.
Couple (1)	The two ends of the line are coupled to the value of the SEM Offset Abs Limit Start attribute.

SEM_OFFSET_ABSOLUTE_LIMIT_START = 1081360

Specifies the absolute power limit corresponding to the beginning of the offset segment. This value is expressed in dBm. This power limit is also set as the stop limit for the offset segment when you set the OFFSET_ABSOLUTE_LIMIT_MODE attribute to Couple.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is -10.

SEM_OFFSET_ABSOLUTE_LIMIT_STOP = 1081361

Specifies the absolute power limit corresponding to the end of the offset segment. This value is expressed in dBm. The measurement ignores this attribute when you set the OFFSET_ABSOLUTE_LIMIT_MODE attribute to Couple.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is -10.

SEM_OFFSET_BANDWIDTH_INTEGRAL = 1081356

Specifies the resolution of the spectrum to compare with spectral mask limits as an integer multiple of the resolution bandwidth (RBW).

If you set this attribute to a value greater than 1, the measurement acquires the spectrum with a narrow resolution and then processes it digitally to get a wider resolution that is equal to the product of the bandwidth integral and the RBW.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 1.

SEM_OFFSET_ENABLED = 1081362

Specifies whether to enable the offset segment for SEM measurement.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	Disables the offset segment for the SEM measurement.
True (1)	Enables the offset segment for the SEM measurement.

SEM_OFFSET_FREQUENCY_DEFINITION = 1081420

Specifies the definition of the start frequency and stop frequency of the offset segments from the nearest carrier channels.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Carrier Center to Meas BW Center.

Name (Value)	Description
Carrier Center to Meas BW Center (0)	The start frequency and stop frequency are defined from the center of the closest carrier channel bandwidth to the center of the offset segment measurement bandwidth. Measurement Bandwidth = Resolution Bandwidth * Bandwidth Integral.
Carrier Center to Meas BW Edge (1)	The start frequency and stop frequency are defined from the center of the closest carrier channel bandwidth to the nearest edge of the offset segment measurement bandwidth.
Carrier Edge to Meas BW Center (2)	The start frequency and stop frequency are defined from the nearest edge of the closest carrier channel bandwidth to the center of the nearest offset segment measurement bandwidth.
Carrier Edge to Meas BW Edge (3)	The start frequency and stop frequency are defined from the nearest edge of the closest carrier channel bandwidth to the edge of the nearest offset segment measurement bandwidth.

SEM_OFFSET_LIMIT_FAIL_MASK = 1081357

Specifies the criteria to determine the measurement fail status.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Absolute.

Name (Value)	Description
Abs AND Rel (0)	The measurement fails if the power in the segment exceeds both the absolute and relative masks.
Abs OR Rel (1)	The measurement fails if the power in the segment exceeds either the absolute or relative mask.
Absolute (2)	The measurement fails if the power in the segment exceeds the absolute mask.
Relative (3)	The measurement fails if the power in the segment exceeds the relative mask.

SEM_OFFSET_RBW_FILTER_AUTO_BANDWIDTH = 1081366

Specifies whether the measurement computes the resolution bandwidth (RBW).

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the SEM Offset RBW attribute.
True (1)	The measurement computes the RBW.

SEM_OFFSET_RBW_FILTER_BANDWIDTH = 1081367

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired offset segment, when you set the OFFSET_RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 10 kHz.

SEM_OFFSET_RBW_FILTER_BANDWIDTH_DEFINITION = 1081421

Specifies the bandwidth definition which you use to specify the value of the OFFSET_RBW_FILTER_BANDWIDTH attribute.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3dB bandwidth of the RBW filter. When you set the SEM Offset RBW Filter Type attribute to FFT Based, RBW is the 3dB bandwidth of the window specified by the SEM FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the spectrum bin width computed using FFT when you set the SEM Offset RBW Filter Type attribute to FFT Based.

SEM_OFFSET_RBW_FILTER_TYPE = 1081368

Specifies the shape of the digital resolution bandwidth (RBW) filter.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.

SEM_OFFSET_RELATIVE_ATTENUATION = 1081358

Specifies the attenuation relative to the external attenuation specified by the EXTERNAL_ATTENUATION attribute. This value is expressed in dB. Use the SEM Offset Rel Attn attribute to compensate for the variations in external attenuation when offset segments are spread wide in frequency.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 0.

SEM_OFFSET_RELATIVE_LIMIT_MODE = 1081369

Specifies whether the relative limit mask is a flat line or a line with a slope.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Manual.

Name (Value)	Description
Manual (0)	The line specified by the SEM Offset Rel Limit Start and SEM Offset Rel Limit Stop attribute values as the two ends is considered as the mask.
Couple (1)	The two ends of the line are coupled to the value of the SEM Offset Rel Limit Start attribute.

SEM_OFFSET_RELATIVE_LIMIT_START = 1081370

Specifies the relative power limit corresponding to the beginning of the offset segment. This value is expressed in dB. This power limit is also set as the stop limit for the offset segment when you set the OFFSET_RELATIVE_LIMIT_MODE attribute to Couple.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is -20.

SEM_OFFSET_RELATIVE_LIMIT_STOP = 1081371

Specifies the relative power limit corresponding to the end of the offset segment. This value is expressed in dB. The measurement ignores this attribute when you set the OFFSET_RELATIVE_LIMIT_MODE attribute to Couple.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is -30.

SEM_OFFSET_SIDEBAND = 1081363

Specifies whether the offset segment is present on one side, or on both sides of the carrier.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is Both.

Name (Value)	Description
Neg (0)	Configures a lower offset segment to the left of the leftmost carrier.
Pos (1)	Configures an upper offset segment to the right of the rightmost carrier.
Both (2)	Configures both negative and positive offset segments.

SEM_OFFSET_START_FREQUENCY = 1081364

Specifies the start frequency of the offset segment relative to the closest configured carrier channel bandwidth center or carrier channel bandwidth edge based on the value of the OFFSET_FREQUENCY_DEFINITION attribute. This value is expressed in Hz.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 1 MHz.

SEM_OFFSET_STOP_FREQUENCY = 1081365

Specifies the stop frequency of the offset segment relative to the closest configured carrier channel bandwidth center or carrier channel bandwidth edge based on the value of the OFFSET_FREQUENCY_DEFINITION attribute. This value is expressed in Hz.

Use “offset<n>” as the Selector String to configure or read this attribute.

The default value is 2 MHz.

SEM_POWER_UNITS = 1081372

Specifies the units for the absolute power.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is dBm.

Name (Value)	Description
dBm (0)	The absolute powers are reported in dBm.
dBm/Hz (1)	The absolute powers are reported in dBm/Hz.

SEM_REFERENCE_TYPE = 1081380

Specifies whether the power reference is the integrated power or the peak power in the closest carrier channel. The leftmost carrier is the carrier closest to all the lower (negative) offset segments. The rightmost carrier is the carrier closest to all the upper (positive) offset segments.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Integration.

Name (Value)	Description
Integration (0)	The power reference is the integrated power of the closest carrier.
Peak (1)	The power reference is the peak power of the closest carrier.

SEM_RESULTS_CARRIER_ABSOLUTE_POWER = 1081389

Returns the carrier power.

The carrier power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “carrier<n>” as the Selector String to read this result.

SEM_RESULTS_CARRIER_FREQUENCY = 1081387

Returns the center frequency of the carrier relative to the CENTER_FREQUENCY attribute. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

SEM_RESULTS_CARRIER_INTEGRATION_BANDWIDTH = 1081388

Returns the frequency range, over which the measurement integrates the carrier power. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

SEM_RESULTS_CARRIER_PEAK_ABSOLUTE_POWER = 1081391

Returns the peak power in the carrier channel.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “carrier<n>” as the Selector String to read this result.

SEM_RESULTS_CARRIER_PEAK_FREQUENCY = 1081392

Returns the frequency at which the peak power occurs in the carrier channel. This value is expressed in Hz.

Use “carrier<n>” as the Selector String to read this result.

SEM_RESULTS_CARRIER_TOTAL_RELATIVE_POWER = 1081390

Returns the carrier power relative to the total carrier power of all enabled carriers. This value is expressed in dB.

Use “carrier<n>” as the Selector String to read this result.

SEM_RESULTS_COMPOSITE_MEASUREMENT_STATUS = 1081385

Indicates the overall measurement status based on the measurement limits and the fail criteria that you set in the OFFSET_LIMIT_FAIL_MASK attribute for each offset segment.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

Name (Value)	Description
Fail (0)	Indicates that the measurement has failed.
Pass (1)	Indicates that the measurement has passed.

SEM_RESULTS_FREQUENCY_RESOLUTION = 1081386

Returns the frequency bin spacing of the spectrum acquired by the measurement. This value is expressed in Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

SEM_RESULTS_LOWER_OFFSET_MARGIN = 1081401

Returns the margin from the limit mask value that you set in the OFFSET_LIMIT_FAIL_MASK attribute. This value is expressed in dB. Margin is defined as the maximum difference between the spectrum and the limit mask.

When you set the SEM Offset Limit Fail Mask attribute to Absolute, the margin is with reference to the absolute limit mask.

When you set the SEM Offset Limit Fail Mask attribute to Relative, the margin is with reference to the relative limit mask.

When you set the SEM Offset Limit Fail Mask attribute to Abs AND Rel, the margin is the maximum of the margins referenced to the absolute and relative limit masks.

When you set the SEM Offset Limit Fail Mask attribute to Abs OR Rel, the margin is the minimum of the margins referenced to the absolute and relative limit masks.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_MARGIN_ABSOLUTE_POWER = 1081402

Returns the power, at which the margin occurred in the lower (negative) offset segment.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_MARGIN_FREQUENCY = 1081404

Returns the frequency at which the margin occurred in the lower (negative) offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_MARGIN_RELATIVE_POWER = 1081403

Returns the power at which the margin occurred in the lower (negative) offset segment relative to the integrated or peak power of the reference carrier. This value is expressed in dB.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_MEASUREMENT_STATUS = 1081405

Indicates the lower offset segment measurement status based on measurement limits and the fail criteria that you specify in the OFFSET_LIMIT_FAIL_MASK attribute.

Use “offset<n>” as the Selector String to read this result.

Name (Value)	Description
Fail (0)	Indicates that the measurement has failed.
Pass (1)	Indicates that the measurement has passed.

SEM_RESULTS_LOWER_OFFSET_PEAK_ABSOLUTE_POWER = 1081398

Returns the peak power measured in the lower (negative) offset segment.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_PEAK_FREQUENCY = 1081400

Returns the frequency at which the peak power occurred in the lower offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_PEAK_RELATIVE_POWER = 1081399

Returns the peak power measured in the lower (negative) offset segment relative to the integrated or peak power of the reference carrier.

When you set the REFERENCE_TYPE attribute to Integration, the reference carrier power is the total power in the reference carrier. When you set the SEM Ref Type attribute to Peak, the reference carrier power is the peak power in the reference carrier.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_POWER_REFERENCE_CARRIER = 1081395

Returns the index of the carrier that was used as the power reference to define the lower (negative) offset segment relative power. The reference carrier is the carrier that has an offset closest to the offset segment.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_START_FREQUENCY = 1081393

Returns the start frequency of the lower (negative) offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_STOP_FREQUENCY = 1081394

Returns the stop frequency of the lower (negative) offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_TOTAL_ABSOLUTE_POWER = 1081396

Returns the power measured in the lower (negative) offset segment.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_LOWER_OFFSET_TOTAL_RELATIVE_POWER = 1081397

Returns the power measured in the lower (negative) offset segment relative to either the integrated or peak power of the reference carrier.

When you set the REFERENCE_TYPE attribute to Integration, the reference carrier power is the total power in the reference carrier. When you set the SEM Ref Type attribute to Peak, the reference carrier power is the peak power in the reference carrier.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_TOTAL_CARRIER_POWER = 1081384

Returns the total integrated power, in dBm, of all the enabled carriers measured when you set the POWER_UNITS attribute to dBm. Returns the power spectral density, in dBm/Hz, when you set the SEM Power Units attribute to dBm/Hz.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

SEM_RESULTS_UPPER_OFFSET_MARGIN = 1081414

Returns the margin from the limit mask value that you set in the OFFSET_LIMIT_FAIL_MASK attribute. This value is expressed in dB. Margin is defined as the maximum difference between the spectrum and the limit mask.

When you set the SEM Offset Limit Fail Mask attribute to Absolute, the margin is with reference to the absolute limit mask.

When you set the SEM Offset Limit Fail Mask attribute to Relative, the margin is with reference to the relative limit mask.

When you set the SEM Offset Limit Fail Mask attribute to Abs AND Rel, the margin is the maximum of the margin referenced to the absolute and relative limit masks.

When you set the SEM Offset Limit Fail Mask attribute to Abs OR Rel, the margin is the minimum of the margin referenced to the absolute and relative limit masks.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_MARGIN_ABSOLUTE_POWER = 1081415

Returns the power, at which the margin occurred in the upper (positive) offset segment.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_MARGIN_FREQUENCY = 1081417

Returns the frequency at which the margin occurred in the upper (positive) offset. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_MARGIN_RELATIVE_POWER = 1081416

Returns the power at which the margin occurred in the upper (positive) offset segment relative to the integrated or peak power of the reference carrier. This value is expressed in dB.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_MEASUREMENT_STATUS = 1081418

Indicates the upper offset measurement status based on measurement limits and the fail criteria that you specify in the OFFSET_LIMIT_FAIL_MASK attribute.

Use “offset<n>” as the Selector String to read this result.

Name (Value)	Description
Fail (0)	Indicates that the measurement has failed.
Pass (1)	Indicates that the measurement has passed.

SEM_RESULTS_UPPER_OFFSET_PEAK_ABSOLUTE_POWER = 1081411

Returns the peak power measured in the upper (positive) offset segment.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_PEAK_FREQUENCY = 1081413

Returns the frequency at which the peak power occurred in the upper offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_PEAK_RELATIVE_POWER = 1081412

Returns the peak power measured in the upper (positive) offset segment relative to the integrated or peak power of the reference carrier.

When you set the REFERENCE_TYPE attribute to Integration, the reference carrier power is the total power in the reference carrier. When you set the SEM Ref Type attribute to Peak, the reference carrier power is the peak power in the reference carrier.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_POWER_REFERENCE_CARRIER = 1081408

Returns the index of the carrier that was used as the power reference to define the upper (positive) offset segment relative power. The reference carrier is the carrier that has an offset closest to the offset segment.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_START_FREQUENCY = 1081406

Returns the start frequency of the upper (positive) offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_STOP_FREQUENCY = 1081407

Returns the stop frequency of the upper (positive) offset segment. This value is expressed in Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_TOTAL_ABSOLUTE_POWER = 1081409

Returns the offset segment power measured in the upper (positive) offset segment.

The power is reported in dBm when you set the POWER_UNITS attribute to dBm, and in dBm/Hz when you set the SEM Power Units attribute to dBm/Hz.

Use “offset<n>” as the Selector String to read this result.

SEM_RESULTS_UPPER_OFFSET_TOTAL_RELATIVE_POWER = 1081410

Returns the power measured in the upper (positive) offset segment relative to the integrated or peak power of the reference carrier.

When you set the REFERENCE_TYPE attribute to Integration, the reference carrier power is the total power in the reference carrier. When you set the SEM Ref Type attribute to Peak, the reference carrier power is the peak power in the reference.

Use “offset<n>” as the Selector String to read this result.

SEM_SWEEP_TIME_AUTO = 1081381

Specifies whether the measurement computes the sweep time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the SEM Sweep Time attribute.
True (1)	The measurement calculates the sweep time based on the value of the SEM Offset RBW and SEM Carrier RBW attributes.

SEM_SWEEP_TIME_INTERVAL = 1081382

Specifies the sweep time when you set the SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

SPECTRUM_AMPLITUDE_CORRECTION_TYPE = 1085463

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

SPECTRUM_ANALYSIS_INPUT = 1085475

Specifies whether to analyze just the real I or Q component of the acquired IQ data, or analyze the complex IQ data.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is IQ.

Name (Value)	Description
IQ (0)	Measurement analyzes the acquired I+jQ data, resulting generally in a spectrum that is not symmetric around 0 Hz. Spectrum trace result contains both positive and negative frequencies. Since the RMS power of the complex envelope is 3.01 dB higher than that of its equivalent real RF signal, the spectrum trace result of the acquired I+jQ data is scaled by -3.01 dB.
I Only (1)	Measurement ignores the Q data from the acquired I+jQ data and analyzes I+j0, resulting in a spectrum that is symmetric around 0 Hz. Spectrum trace result contains positive frequencies only. Spectrum of I+j0 data is scaled by +3.01 dB to account for the power of the negative frequencies that are not returned in the spectrum trace.
Q Only (2)	Measurement ignores the I data from the acquired I+jQ data and analyzes Q+j0, resulting in a spectrum that is symmetric around 0 Hz. Spectrum trace result contains positive frequencies only. Spectrum of Q+j0 data is scaled by +3.01 dB to account for the power of the negative frequencies that are not returned in the spectrum trace.

SPECTRUM_AVERAGING_COUNT = 1085445

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

SPECTRUM_AVERAGING_ENABLED = 1085446

Specifies whether to enable averaging for the spectrum measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The spectrum measurement uses the Spectrum Averaging Count attribute as the number of acquisitions over which the spectrum measurement is averaged.

SPECTRUM_AVERAGING_TYPE = 1085448

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for spectrum measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

SPECTRUM_DETECTOR_POINTS = 1085465

Specifies the number of trace points after the detector is applied.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1001.

SPECTRUM_DETECTOR_TYPE = 1085464

Specifies the type of detector to be used.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is None.

Refer to Spectral Measurements Concepts topic for more information on detector types.

Name (Value)	Description
None (0)	The detector is disabled.
Sample (1)	The middle sample in the bucket is detected.
Normal (2)	The maximum value of the samples within the bucket is detected if the signal only rises or if the signal only falls. If the signal, within a bucket, both rises and falls, then the maximum and minimum values of the samples are detected in alternate buckets.
Peak (3)	The maximum value of the samples in the bucket is detected.
Negative Peak (4)	The minimum value of the samples in the bucket is detected.
Average RMS (5)	The average RMS of all the samples in the bucket is detected.
Average Voltage (6)	The average voltage of all the samples in the bucket is detected.
Average Log (7)	The average log of all the samples in the bucket is detected.

SPECTRUM_FFT_OVERLAP = 1085477

Specifies the samples to overlap between the consecutive chunks as a percentage of the SEQUENTIAL_FFT_SIZE attribute when you set the MEASUREMENT_METHOD attribute to Sequential FFT and the FFT_OVERLAP_MODE attribute to User Defined. This value is expressed as a percentage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

SPECTRUM_FFT_OVERLAP_MODE = 1085476

Specifies the overlap mode when you set the MEASUREMENT_METHOD attribute to Sequential FFT.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Disabled.

Name (Value)	Description
Disabled (0)	Disables the overlap between the chunks.
Automatic (1)	Measurement sets the overlap based on the value you have set for the Spectrum FFT Window attribute. When you set the Spectrum FFT Window attribute to any value other than None, the number of overlapped samples between consecutive chunks is set to 50% of the value of the Spectrum Sequential FFT Size attribute. When you set the Spectrum FFT Window attribute to None, the chunks are not overlapped and the overlap is set to 0%.
User Defined (2)	Measurement uses the overlap that you specify in the Spectrum FFT Overlap (%) attribute.

SPECTRUM_FFT_OVERLAP_TYPE = 1085478

Specifies the overlap type when you set the MEASUREMENT_METHOD attribute to Sequential FFT.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	Linear averaging of the FFTs taken over different chunks of data is performed. RMS averaging reduces signal fluctuations but not the noise floor.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one chunk FFT to the next.

SPECTRUM_FFT_PADDING = 1085450

Specifies the factor by which the time-domain waveform is zero-padded before FFT. The FFT size is given by the following formula:

waveform size * padding

This attribute is used only when the acquisition span is less than the device instantaneous bandwidth of the device.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

SPECTRUM_FFT_WINDOW = 1085449

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a good balance of spectral leakage, frequency resolution, and amplitude attenuation. Hence, this windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

SPECTRUM_MEASUREMENT_ENABLED = 1085440

Specifies whether to enable the spectrum measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

SPECTRUM_MEASUREMENT_METHOD = 1085479

Specifies the method for performing the Spectrum measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Normal.

Name (Value)	Description
Normal (0)	The Spectrum measurement acquires the spectrum using the same signal analyzer setting across frequency bands.
Sequential FFT (2)	The Spectrum measurement acquires I/Q samples for a duration specified by the Spectrum Sweep Time attribute. These samples are divided into smaller chunks. If the attribute Spectrum RBW Auto is True, The size of each chunk is defined by the Spectrum Sequential FFT Size attribute. If the attribute Spectrum RBW Auto is False, the Spectrum Sequential FFT Size is auto computed based on the configured Spectrum RBW. The overlap between the chunks is defined by the Spectrum FFT Overlap Mode attribute. FFT is computed on each of these chunks. The resultant FFTs are averaged as per the configured averaging type in the attribute Spectrum FFT Overlap Typeto get the spectrum.

SPECTRUM_MEASUREMENT_MODE = 1085470

Specifies whether the measurement calibrates the noise floor of analyzer or performs the spectrum measurement. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Measure.

Name (Value)	Description
Measure (0)	Spectrum measurement is performed on the acquired signal.
Calibrate Noise Floor (1)	Manual noise calibration of the signal analyzer is performed for the spectrum measurement.

SPECTRUM_NOISE_CALIBRATION_AVERAGING_AUTO = 1085473

Specifies whether RFmx automatically computes the averaging count used for instrument noise calibration.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	RFmx uses the averages that you set for the Spectrum Noise Cal Averaging Count attribute.
True (1)	RFmx uses a noise calibration averaging count of 32.

SPECTRUM_NOISE_CALIBRATION_AVERAGING_COUNT = 1085472

Specifies the averaging count used for noise calibration when you set the NOISE_CALIBRATION_AVERAGING_AUTO attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 32.

SPECTRUM_NOISE_CALIBRATION_MODE = 1085474

Specifies whether the noise calibration and measurement is performed manually by the user or automatically by RFmx. Refer to the measurement guidelines section in the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Auto.

Name (Value)	Description
Manual (0)	When you set the Spectrum Meas Mode attribute to Calibrate Noise Floor, you can initiate instrument noise calibration for the spectrum measurement manually. When you set the Spectrum Meas Mode attribute to Measure, you can initiate the spectrum measurement manually.
Auto (1)	When you set the Spectrum Noise Comp Enabled attribute to True, RFmx sets the Input Isolation Enabled attribute to Enabled and calibrates the intrument noise in the current state of the instrument. RFmx then resets the Input Isolation Enabled attribute and performs the spectrum measurement, including compensation for noise from the instrument. RFmx skips noise calibration in this mode if valid noise calibration data is already cached. When you set the Spectrum Noise Comp Enabled attribute to False, RFmx does not calibrate instrument noise and performs only the spectrum measurement without compensating for the noise from the instrument.

SPECTRUM_NOISE_COMPENSATION_ENABLED = 1085456

Specifies whether RFmx compensates for the instrument noise while performing the measurement when you set the NOISE_CALIBRATION_MODE attribute to Auto, or when you set the Spectrum Noise Cal Mode attribute to Manual and MEASUREMENT_MODE to Measure. Refer to the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Supported Devices: PXIe-5663/5665/5668, PXIe-5830/5831/5832

Name (Value)	Description
False (0)	Disables compensation of the spectrum for the noise floor of the signal analyzer.
True (1)	Enables compensation of the spectrum for the noise floor of the signal analyzer. The noise floor of the signal analyzer is measured for the RF path used by the Spectrum measurement and cached for future use. If signal analyzer or measurement parameters change, noise floors are measured again.

SPECTRUM_NOISE_COMPENSATION_TYPE = 1085471

Specifies the noise compensation type. Refer to the Noise Compensation Algorithm topic for more information.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Analyzer and Termination.

Name (Value)	Description
Analyzer and Termination (0)	Compensates for noise from the analyzer and the 50 ohm termination. The measured power values are in excess of the thermal noise floor.
Analyzer Only (1)	Compensates for the analyzer noise only.

SPECTRUM_NUMBER_OF_ANALYSIS_THREADS = 1085442

Specifies the maximum number of threads used for parallelism for spectrum measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

SPECTRUM_POWER_UNITS = 1085461

Specifies the units for the absolute power.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is dBm.

Name (Value)	Description
dBm (0)	The absolute powers are reported in dBm.
dBm/Hz (1)	The absolute powers are reported in dBm/Hz.
dBW (2)	The absolute powers are reported in dBW.
dBV (3)	The absolute powers are reported in dBV.
dBmV (4)	The absolute powers are reported in dBmV.
dBuV (5)	The absolute powers are reported in dBuV.
W (6)	The absolute powers are reported in W.
Volts (7)	The absolute powers are reported in volts.
Volts Squared (8)	The absolute powers are reported in volts2.

SPECTRUM_RBW_FILTER_AUTO_BANDWIDTH = 1085451

Specifies whether the measurement computes the resolution bandwidth (RBW).

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the Spectrum RBW attribute.
True (1)	The measurement computes the RBW.

SPECTRUM_RBW_FILTER_BANDWIDTH = 1085452

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired signal, when you set the RBW_FILTER_AUTO_BANDWIDTH attribute to False. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10 kHz.

SPECTRUM_RBW_FILTER_BANDWIDTH_DEFINITION = 1085462

Specifies the bandwidth definition which you use to specify the value of the RBW_FILTER_BANDWIDTH attribute.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3dB bandwidth of the RBW filter. When you set the Spectrum RBW Filter Type attribute to FFT Based, RBW is the 3dB bandwidth of the window specified by the Spectrum FFT Window attribute.
6dB (1)	Defines the RBW in terms of the 6dB bandwidth of the RBW filter. When you set the Spectrum RBW Filter Type attribute to FFT Based, RBW is the 6dB bandwidth of the window specified by the Spectrum FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the spectrum bin width computed using FFT when you set the Spectrum RBW Filter Type attribute to FFT Based.
ENBW (3)	Defines the RBW in terms of the ENBW bandwidth of the RBW filter. When you set the Spectrum RBW Filter Type attribute to FFT Based, RBW is the ENBW bandwidth of the window specified by the Spectrum FFT Window attribute.

SPECTRUM_RBW_FILTER_TYPE = 1085453

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.

SPECTRUM_RESULTS_FREQUENCY_RESOLUTION = 1085460

Returns the frequency bin spacing of the spectrum acquired by the measurement. This value is expressed in Hz. This attribute is not valid if you set the SPAN attribute to 0.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

SPECTRUM_RESULTS_PEAK_AMPLITUDE = 1085458

Returns the peak amplitude, of the averaged spectrum.

When you set the SPAN attribute to 0, the measurement returns the peak amplitude in the time domain power trace.

The amplitude is reported in units specified by the value of the POWER_UNITS attribute.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

SPECTRUM_RESULTS_PEAK_FREQUENCY = 1085459

Returns the frequency at the peak amplitude of the averaged spectrum. This value is expressed in Hz. This attribute is not valid if you set the SPAN attribute to 0.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

SPECTRUM_SEQUENTIAL_FFT_SIZE = 1085480

Specifies the FFT size when you set the MEASUREMENT_METHOD attribute to Sequential FFT. If the attribute RBW_FILTER_AUTO_BANDWIDTH is False, FFT Size is auto computed based on the configured RBW_FILTER_BANDWIDTH

The default value is 512.

SPECTRUM_SPAN = 1085443

Specifies the frequency range around the center frequency, to acquire for the measurement. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1 MHz.

SPECTRUM_SWEEP_TIME_AUTO = 1085454

Specifies whether the measurement computes the sweep time.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the Spectrum Sweep Time attribute.
True (1)	The measurement calculates the sweep time based on the value of the Spectrum RBW attribute.

SPECTRUM_SWEEP_TIME_INTERVAL = 1085455

Specifies the sweep time when you set the SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

SPECTRUM_VBW_FILTER_AUTO_BANDWIDTH = 1085466

Specifies whether the video bandwidth (VBW) is expressed directly or computed based on the VBW to RBW ratio.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Specify the video bandwidth in the Spectrum VBW attribute. The Spectrum VBW to RBW Ratio attribute is disregarded in this mode.
True (1)	Specify video bandwidth in terms of the VBW to RBW ratio. The value of the video bandwidth is then computed by using the Spectrum VBW to RBW Ratio attribute and the Spectrum RBW attribute. The value of the Spectrum VBW attribute is disregarded in this mode.

SPECTRUM_VBW_FILTER_BANDWIDTH = 1085467

Specifies the video bandwidth (VBW) in Hz when you set the VBW_FILTER_AUTO_BANDWIDTH attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 30000.

SPECTRUM_VBW_FILTER_VBW_TO_RBW_RATIO = 1085468

Specifies the VBW to RBW Ratio when you set the VBW_FILTER_AUTO_BANDWIDTH attribute to True .

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3.

SPUR_ALL_TRACES_ENABLED = 1089560

Specifies whether to enable the traces to be stored and retrieved after performing the spurious emissions (Spur) measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

Supported devices: PXIe-5665/5668

SPUR_AMPLITUDE_CORRECTION_TYPE = 1089572

Specifies whether the amplitude of the frequency bins, used in the measurement, is corrected for external attenuation at the RF center frequency, or at the individual frequency bins. Use the nirfmxinstr.session.Session.configure_external_attenuation_table() method to configure the external attenuation table.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RF Center Frequency.

Name (Value)	Description
RF Center Frequency (0)	All the frequency bins in the spectrum are compensated with a single external attenuation value that corresponds to the RF center frequency.
Spectrum Frequency Bin (1)	An individual frequency bin in the spectrum is compensated with the external attenuation value corresponding to that frequency.

SPUR_AVERAGING_COUNT = 1089546

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

Supported devices: PXIe-5665/5668

SPUR_AVERAGING_ENABLED = 1089547

Specifies whether to enable averaging for the spurious emission (Spur) measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The Spur measurement uses the Spur Averaging Count attribute as the number of acquisitions over which the Spur measurement is averaged.

SPUR_AVERAGING_TYPE = 1089549

Specifies the averaging type for averaging multiple spectrum acquisitions. The averaged spectrum is used for spurious emission (Spur) measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Supported devices: PXIe-5665/5668

Name (Value)	Description
RMS (0)	The power spectrum is linearly averaged. RMS averaging reduces signal fluctuations but not the noise floor.
Log (1)	The power spectrum is averaged in a logarithmic scale.
Scalar (2)	The square root of the power spectrum is averaged.
Max (3)	The peak power in the spectrum at each frequency bin is retained from one acquisition to the next.
Min (4)	The least power in the spectrum at each frequency bin is retained from one acquisition to the next.

SPUR_FFT_WINDOW = 1089551

Specifies the FFT window type to use to reduce spectral leakage.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Flat Top.

Supported devices: PXIe-5665/5668

Name (Value)	Description
None (0)	Analyzes transients for which duration is shorter than the window length. You can also use this window type to separate two tones with frequencies close to each other but with almost equal amplitudes.
Flat Top (1)	Measures single-tone amplitudes accurately.
Hanning (2)	Analyzes transients for which duration is longer than the window length. You can also use this window type to provide better frequency resolution for noise measurements.
Hamming (3)	Analyzes closely-spaced sine waves.
Gaussian (4)	Provides a balance of spectral leakage, frequency resolution, and amplitude attenuation. This windowing is useful for time-frequency analysis.
Blackman (5)	Analyzes single tone because it has a low maximum side lobe level and a high side lobe roll-off rate.
Blackman-Harris (6)	Useful as a good general purpose window, having side lobe rejection greater than 90 dB and having a moderately wide main lobe.
Kaiser-Bessel (7)	Separates two tones with frequencies close to each other but with widely-differing amplitudes.

SPUR_MEASUREMENT_ENABLED = 1089536

Specifies whether to enable the spurious emission (Spur) measurement.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

The default value is FALSE.

Supported devices: PXIe-5665/5668

SPUR_NUMBER_OF_ANALYSIS_THREADS = 1089539

Specifies the maximum number of threads used for parallelism for spurious emission (Spur) measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

Supported devices: PXIe-5665/5668

SPUR_NUMBER_OF_RANGES = 1089540

Specifies the number of ranges.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

Supported devices: PXIe-5665/5668

SPUR_RANGE_ABSOLUTE_LIMIT_MODE = 1089552

Specifies whether the absolute limit threshold is a flat line or a line with a slope.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is Couple.

Supported devices: PXIe-5665/5668

Name (Value)	Description
Manual (0)	The line specified by the Spur Range Abs Limit Start and Spur Range Abs Limit Stop attribute values as the two ends is considered as the threshold.
Couple (1)	The two ends of the line are coupled to the value of the Spur Range Abs Limit Start attribute.

SPUR_RANGE_ABSOLUTE_LIMIT_START = 1089553

Specifies the absolute power limit corresponding to the beginning of the frequency range. This value is expressed in dBm. This power limit is also set as the absolute power limit for the range when you set the RANGE_ABSOLUTE_LIMIT_MODE attribute to Couple.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is -10.

Supported devices: PXIe-5665/5668

SPUR_RANGE_ABSOLUTE_LIMIT_STOP = 1089554

Specifies the absolute power limit corresponding to the end of the frequency range. This value is expressed in dBm. The measurement ignores this attribute when you set the RANGE_ABSOLUTE_LIMIT_MODE attribute to Couple.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is -10.

Supported devices: PXIe-5665/5668

SPUR_RANGE_DETECTOR_POINTS = 1089574

Specifies the number of range points after the detector is applied.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 1001.

SPUR_RANGE_DETECTOR_TYPE = 1089573

Specifies the type of detector to be used.

Use “range<n>” as the Selector String to configure or read this attribute.

Refer to Spectral Measurements Concepts topic for more information on detector types.

The default value is None.

Name (Value)	Description
None (0)	The detector is disabled.
Sample (1)	The middle sample in the bucket is detected.
Normal (2)	The maximum value of the samples within the bucket is detected if the signal only rises or if the signal only falls. If the signal, within a bucket, both rises and falls, then the maximum and minimum values of the samples are detected in alternate buckets.
Peak (3)	The maximum value of the samples in the bucket is detected.
Negative Peak (4)	The minimum value of the samples in the bucket is detected.
Average RMS (5)	The average RMS of all the samples in the bucket is detected.
Average Voltage (6)	The average voltage of all the samples in the bucket is detected.
Average Log (7)	The average log of all the samples in the bucket is detected.

SPUR_RANGE_ENABLED = 1089541

Specifies whether to measure the spurious emissions (Spur) in the frequency range.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is True.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	Disables the acquisition of the frequency range.
True (1)	Enables measurement of Spurs in the frequency range.

SPUR_RANGE_NUMBER_OF_SPURS_TO_REPORT = 1089543

Specifies the number of spurious emissions (Spur) that the measurement should report in the frequency range.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 10.

Supported devices: PXIe-5665/5668

SPUR_RANGE_PEAK_EXCURSION = 1089570

Specifies the peak excursion value used to find the spurs in the spectrum. This value is expressed in dB. The signal should rise and fall by at least the peak excursion value, above the threshold, to be considered a spur.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 0.

Supported devices: PXIe-5665/5668

SPUR_RANGE_PEAK_THRESHOLD = 1089569

Specifies the threshold level above which the measurement detects spurs in the range that you specify using the RANGE_START_FREQUENCY and RANGE_STOP_FREQUENCY attributes. This value is expressed in dBm.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is -200.

Supported devices: PXIe-5665/5668

SPUR_RANGE_RBW_FILTER_AUTO_BANDWIDTH = 1089555

Specifies whether the measurement computes the resolution bandwidth (RBW).

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is True.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	The measurement uses the RBW that you specify in the Spur Range RBW attribute.
True (1)	The measurement computes the RBW.

SPUR_RANGE_RBW_FILTER_BANDWIDTH = 1089556

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to sweep the acquired signal, when you set the RANGE_RBW_FILTER_AUTO_BANDWIDTH attribute to False.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 10 kHz.

Supported devices: PXIe-5665/5668

SPUR_RANGE_RBW_FILTER_BANDWIDTH_DEFINITION = 1089571

Specifies the bandwidth definition which you use to specify the value of the RANGE_RBW_FILTER_BANDWIDTH attribute.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 3dB.

Name (Value)	Description
3dB (0)	Defines the RBW in terms of the 3dB bandwidth of the RBW filter. When you set the Spur Range RBW Filter Type attribute to FFT Based, RBW is the 3dB bandwidth of the window specified by the Spur FFT Window attribute.
Bin Width (2)	Defines the RBW in terms of the spectrum bin width computed using FFT when you set the Spur Range RBW Filter Type attribute to FFT Based.
ENBW (3)	Defines the RBW in terms of the ENBW bandwidth of the RBW filter. When you set the Spur RBW Filter Type attribute to FFT Based, RBW is the ENBW bandwidth of the window specified by the Spur FFT Window attribute.

SPUR_RANGE_RBW_FILTER_TYPE = 1089557

Specifies the shape of the digital resolution bandwidth (RBW) filter.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is Gaussian.

Supported devices: PXIe-5665/5668

Name (Value)	Description
FFT Based (0)	No RBW filtering is performed.
Gaussian (1)	An RBW filter with a Gaussian response is applied.
Flat (2)	An RBW filter with a flat response is applied.

SPUR_RANGE_RELATIVE_ATTENUATION = 1089542

Specifies the attenuation relative to the external attenuation specified by the EXTERNAL_ATTENUATION attribute. This value is expressed in dB. Use the Spur Range Rel Attn attribute to compensate for the variations in external attenuation when offset segments are spread wide in frequency.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 0.

Supported devices: PXIe-5665/5668

SPUR_RANGE_START_FREQUENCY = 1089544

Specifies the start of the frequency range for the measurement. This value is expressed in Hz.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 500 MHz.

Supported devices: PXIe-5665/5668

SPUR_RANGE_STOP_FREQUENCY = 1089545

Specifies the stop of the frequency range for the measurement. This value is expressed in Hz.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 1.5 GHz.

Supported devices: PXIe-5665/5668

SPUR_RANGE_SWEEP_TIME_AUTO = 1089558

Specifies whether the measurement computes the sweep time.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is True.

Supported devices: PXIe-5665/5668

Name (Value)	Description
False (0)	The measurement uses the sweep time that you specify in the Spur Range Sweep Time attribute.
True (1)	The measurement calculates the sweep time based on the value of the Spur Range RBW attribute.

SPUR_RANGE_SWEEP_TIME_INTERVAL = 1089559

Specifies the sweep time when you set the RANGE_SWEEP_TIME_AUTO attribute to False. This value is expressed in seconds.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 0.001.

Supported devices: PXIe-5665/5668

SPUR_RANGE_VBW_FILTER_AUTO_BANDWIDTH = 1089575

Specifies whether the video bandwidth (VBW) is expressed directly or computed based on the VBW to RBW ratio.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is True.

Name (Value)	Description
False (0)	Specify the video bandwidth in the Spur Range VBW attribute. The Spur VBW to RBW Ratio attribute is disregarded in this mode.
True (1)	Specify video bandwidth in terms of the VBW to RBW ratio. The value of the video bandwidth is then computed by using the Spur Range VBW to RBW Ratio attribute and the Spur Range RBW attribute. The value of the Spur Range VBW attribute is disregarded in this mode.

SPUR_RANGE_VBW_FILTER_BANDWIDTH = 1089576

Specifies the video bandwidth (VBW) in Hz when you set the RANGE_VBW_FILTER_AUTO_BANDWIDTH attribute to False.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 30000.

SPUR_RANGE_VBW_FILTER_VBW_TO_RBW_RATIO = 1089577

Specifies the VBW to RBW Ratio when you set the RANGE_VBW_FILTER_AUTO_BANDWIDTH attribute to True.

Use “range<n>” as the Selector String to configure or read this attribute.

The default value is 3.

SPUR_RESULTS_MEASUREMENT_STATUS = 1089561

Indicates the overall measurement status.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

Supported devices: PXIe-5665/5668

Name (Value)	Description
Fail (0)	A detected spur in the range is greater than the value of the Spur Results Spur Abs Limits attribute.
Pass (1)	All detected spurs in the range are lower than the value of the Spur Results Spur Abs Limit attribute.

SPUR_RESULTS_RANGE_ABSOLUTE_LIMIT = 1089564

Returns the threshold used to calculate the margin of the detected spurious emissions (Spur). This value is expressed in dBm. The measurement calculates the threshold using the absolute limit line specified by the RANGE_ABSOLUTE_LIMIT_MODE attribute.

Use “range<n>/spur<k>” as the Selector String to read this result.

Supported devices: PXIe-5665/5668

SPUR_RESULTS_RANGE_AMPLITUDE = 1089563

Returns the amplitude of the detected spurious emissions (Spur). This value is expressed in dBm.

Use “range<n>/spur<k>” as the Selector String to read this result.

Supported devices: PXIe-5665/5668

SPUR_RESULTS_RANGE_FREQUENCY = 1089562

Returns the frequency of the detected spurious emissions (Spur). This value is expressed in Hz.

Use “range<n>/spur<k>” as the Selector String to read this result.

Supported devices: PXIe-5665/5668

SPUR_RESULTS_RANGE_MARGIN = 1089565

Returns the difference between the amplitude and the absolute limit of the detected spurious emissions (Spur) at the Spur frequency.

Use “range<n>/spur<k>” as the Selector String to read this result.

Supported devices: PXIe-5665/5668

SPUR_RESULTS_RANGE_MEASUREMENT_STATUS = 1089566

Indicates the measurement status for the frequency range.

Use “range<n>” as the Selector String to read this result.

Supported devices: PXIe-5665/5668

Name (Value)	Description
Fail (0)	The amplitude of the detected spurs is greater than the value of the Spur Results Spur Abs Limit attribute.
Pass (1)	The amplitude of the detected spurs is lower than the value of the Spur Results Spur Abs Limit attribute.

SPUR_RESULTS_RANGE_NUMBER_OF_DETECTED_SPURS = 1089567

Returns the number of detected spurious emissions (Spur) in the specified frequency range.

Use “range<n>” as the Selector String to read this result.

Supported devices: PXIe-5665/5668

SPUR_TRACE_RANGE_INDEX = 1089568

Specifies the index of the range used to store and retrieve spurious emission (Spur) traces. This attribute is not used if you set the ALL_TRACES_ENABLED to FALSE. When you set this attribute to -1, the measurement stores and retrieves traces for all enabled ranges.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is -1.

Supported devices: PXIe-5665/5668

TRIGGER_DELAY = 1048586

Specifies the trigger delay time. This value is expressed in seconds.

If the delay is negative, the measurement acquires pre-trigger samples. If the delay is positive, the measurement acquires post-trigger samples.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.

TRIGGER_MINIMUM_QUIET_TIME_DURATION = 1048588

Specifies the time duration for which the signal must be quiet before the signal analyzer arms the I/Q power edge trigger. This value is expressed in seconds. If you set the IQ_POWER_EDGE_TRIGGER_SLOPE attribute to Rising Slope, the signal is quiet below the trigger level. If you set the IQ Power Edge Slope attribute to Falling Slope, the signal is quiet above the trigger level.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default of this attribute is hardware dependent.

TRIGGER_MINIMUM_QUIET_TIME_MODE = 1048587

Specifies whether the measurement computes the minimum quiet time used for triggering.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Manual.

Name (Value)	Description
Manual (0)	The minimum quiet time for triggering is the value of the Trigger Min Quiet Time attribute.
Auto (1)	The measurement computes the minimum quiet time used for triggering.

TRIGGER_TYPE = 1048580

Specifies the trigger type.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is None.

Name (Value)	Description
None (0)	No Reference Trigger is configured.
Digital Edge (1)	The Reference Trigger is not asserted until a digital edge is detected. The source of the digital edge is specified using the Digital Edge Source attribute.
IQ Power Edge (2)	The Reference Trigger is asserted when the signal changes past the level specified by the slope (rising or falling), which is configured using the IQ Power Edge Slope attribute.
Software (3)	The Reference Trigger is not asserted until a software trigger occurs.

TXP_ALL_TRACES_ENABLED = 1093648

Specifies whether to enable the traces to be stored and retrieved after performing the TXP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

TXP_AVERAGING_COUNT = 1093637

Specifies the number of acquisitions used for averaging when you set the AVERAGING_ENABLED attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 10.

TXP_AVERAGING_ENABLED = 1093638

Specifies whether to enable averaging for the TXP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	The measurement is performed on a single acquisition.
True (1)	The TXP measurement uses the TXP Averaging Count attribute as the number of acquisitions over which the TXP measurement is averaged.

TXP_AVERAGING_TYPE = 1093640

Specifies the averaging type for the TXP measurement. The averaged power trace is used for the measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is RMS.

Name (Value)	Description
RMS (0)	The power trace is linearly averaged.
Log (1)	The power trace is averaged in a logarithmic scale.
Scalar (2)	The square root of the power trace is averaged.
Max (3)	The maximum instantaneous power in the power trace is retained from one acquisition to the next.
Min (4)	The minimum instantaneous power in the power trace is retained from one acquisition to the next.

TXP_MEASUREMENT_ENABLED = 1093632

Specifies whether to enable the TXP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is FALSE.

TXP_MEASUREMENT_INTERVAL = 1093634

Specifies the acquisition time for the TXP measurement. This value is expressed in seconds.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.001.

TXP_NUMBER_OF_ANALYSIS_THREADS = 1093635

Specifies the maximum number of threads used for parallelism for TXP measurement.

The number of threads can range from 1 to the number of physical cores. The number of threads you set may not be used in calculations. The actual number of threads used depends on the problem size, system resources, data availability, and other considerations.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 1.

TXP_RBW_FILTER_ALPHA = 1093641

Specifies the roll-off factor for the root-raised-cosine (RRC) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 0.1.

TXP_RBW_FILTER_BANDWIDTH = 1093642

Specifies the bandwidth of the resolution bandwidth (RBW) filter used to measure the signal. This value is expressed in Hz.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 100 kHz.

TXP_RBW_FILTER_TYPE = 1093643

Specifies the shape of the digital resolution bandwidth (RBW) filter.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Gaussian.

Name (Value)	Description
Gaussian (1)	The RBW filter has a Gaussian response.
Flat (2)	The RBW filter has a flat response.
None (5)	The measurement does not use any RBW filtering.
RRC (6)	The RRC filter with the roll-off specified by the TXP RBW RRC Alpha attribute is used as the RBW filter.

TXP_RESULTS_AVERAGE_MEAN_POWER = 1093649

Returns the mean power of the signal. This value is expressed in dBm. Only the samples above the threshold are used by the measurement when you set the THRESHOLD_ENABLED attribute to True. When you set the AVERAGING_ENABLED attribute to True, the mean power is measured using the power trace averaged over multiple acquisitions.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

TXP_RESULTS_MAXIMUM_POWER = 1093651

Returns the maximum power of the averaged power trace. This value is expressed in dBm.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

TXP_RESULTS_MINIMUM_POWER = 1093652

Returns the minimum power of the averaged power trace. This value is expressed in dBm.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

TXP_RESULTS_PEAK_TO_AVERAGE_RATIO = 1093650

Returns the ratio of the peak power of the signal to the mean power. Only the samples above the threshold are used by the measurement when you set the THRESHOLD_ENABLED attribute to True. When you set the AVERAGING_ENABLED attribute to True, the peak and mean powers are measured using the power trace averaged over multiple acquisitions.

You do not need to use a selector string to read this result for default signal and result instance. Refer to the Selector String topic for information about the string syntax for named signals and results.

TXP_THRESHOLD_ENABLED = 1093644

Specifies whether to enable thresholding of the acquired samples to be used for the TXP measurement.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is False.

Name (Value)	Description
False (0)	All the acquired samples are considered for the TXP measurement.
True (1)	The samples above the threshold level specified in the TXP Threshold Level attribute are considered for the TXP measurement.

TXP_THRESHOLD_LEVEL = 1093645

Specifies either the relative or absolute threshold power level based on the value of the THRESHOLD_TYPE attribute.

The default value is -20.

TXP_THRESHOLD_TYPE = 1093646

Specifies the reference for the power level used for thresholding.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is Relative.

Name (Value)	Description
Relative (0)	The threshold is relative to the peak power of the acquired samples.
Absolute (1)	The threshold is the absolute power, in dBm.

TXP_VBW_FILTER_AUTO_BANDWIDTH = 1093655

Specifies whether the video bandwidth (VBW) is expressed directly or computed based on the VBW to RBW ratio.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is True.

Name (Value)	Description
False (0)	Specify the video bandwidth in the TXP VBW attribute. The TXP VBW to RBW Ratio attribute is disregarded in this mode.
True (1)	Specify video bandwidth in terms of the VBW to RBW ratio. The value of the video bandwidth is then computed by using the TXP VBW to RBW Ratio attribute and the TXP RBW attribute. The value of the TXP VBW attribute is disregarded in this mode.

TXP_VBW_FILTER_BANDWIDTH = 1093656

Specifies the video bandwidth when you set the VBW_FILTER_AUTO_BANDWIDTH attribute to False.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 30000.

TXP_VBW_FILTER_VBW_TO_RBW_RATIO = 1093657

Specifies the VBW to RBW Ratio when you set the VBW_FILTER_AUTO_BANDWIDTH attribute to True.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

The default value is 3.