RFmxInstr Properties

RFmx Demod 19.1 Help

Edition Date: October 2019

Part Number: 374641M-01

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RFmx Demod 19.1 Help
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Use the RFmxInstr properties to access options for configuring and fetching measurements.

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Property Description
Selector String

Specifies the selector string used to access all subsequent selector string-based properties in this instance of the property node. Details

Automatic SG SA Shared LO

Specifies whether RFmx automatically uses the same LO as RFSG for signal acquisition on RFSA. Details

Frequency Reference:Source

Specifies the frequency reference source. Details

Frequency Reference:Frequency (Hz)

Specifies the Reference Clock rate, when the Frequency Reference Source property is set to ClkIn or RefIn. This value is expressed in Hz. Details

RF Attenuation:Auto

Specifies whether the RFmx driver computes the RF attenuation. Details

RF Attenuation:Value (dB)

Specifies the nominal attenuation setting for all attenuators before the first mixer in the RF signal chain. This value is expressed in dB. Details

Mechanical Attenuation:Auto

Specifies whether the RFmx driver chooses an attenuation setting based on the hardware settings. Details

Mechanical Attenuation:Value (dB)

Specifies the level of mechanical attenuation for the RF path. This value is expressed in dB. Details

LO:LO Leakage Avoidance Enabled

Specifies whether to reduce the effects of LO leakage by placing the LO outside the band of acquisition. This property is ignored if:

Details

LO:LO Source

Specifies the LO signal source used to downconvert the RF input signal. Details

LO:LO Frequency (Hz)

Specifies the LO signal frequency for the configured center frequency. This value is expressed in Hz. Details

LO:LO Export Enabled

Specifies whether to enable the LO OUT terminals on the installed devices. Details

LO:LO2 Export Enabled

Specifies whether to enable the LO2 OUT terminals in the installed devices. Details

LO:LO In Power (dBm)

Specifies the power level expected at the LO IN terminal when the LO Source property is set to LO_In. This value is expressed in dBm. Details

LO:LO Out Power (dBm)

Specifies the power level of the signal at the LO OUT terminal when the LO Export Enabled property is set to TRUE. This value is expressed in dBm. Details

LO:Tuning Speed

Makes tradeoffs between tuning speed and phase noise. Details

LO:Downconverter Frequency Offset (Hz)

Specifies an offset from the center frequency value for the downconverter. Use this property to offset the measurement away from the LO leakage or DC Offset of analyzers that use a direct conversion architecture. You must set this property to half the bandwidth or span of the measurement + guardband. The guardband is needed to ensure that the LO leakage is not inside the analog or digital filter rolloffs. This value is expressed in Hz. Details

LO:Downconverter Center Frequency

Enables in-band retuning and specifies the current frequency of the RF downconverter. This value is expressed in Hz. Details

LO:LO Injection Side

Specifies the LO injection side. Details

LO:LO Frequency Step Size (Hz)

Specifies the step size for tuning the local oscillator (LO) phase-locked loop (PLL). Details

LO:VCO Frequency Step Size (Hz)

Specifies the step size for tuning the internal voltage-controlled oscillator (VCO) used to generate the LO signal. The valid values for LO1 include 1 Hz to 50 MHz and for LO2 include 1 Hz to 100 MHz. Details

LO:LO PLL Fractional Mode

Specifies whether to use fractional mode for the local oscillator (LO) phase-locked loop (PLL). Details

Exporting Signals:Frequency Reference Exported Terminal

Specifies a comma-separated list of the terminals at which to export the frequency reference. Details

Exporting Signals:Trigger Export Output Terminal

Specifies the destination terminal for the exported Reference Trigger. You can also choose not to export any signal. Details

Exporting Signals:Trigger Terminal Name

Returns the fully qualified signal name as a string. Details

Device Information:Device Temperature (deg C)

Returns the current temperature of the module. This value is expressed in degrees Celsius. Details

Device Information:Digitizer Temperature (deg C)

Returns the current temperature of the digitizer module. This value is expressed in degrees Celsius. Details

Device Information:LO Temperature (deg C)

Returns the current temperature of the LO module associated with the device. This value is expressed in degrees Celsius. Details

Device Information:Serial Number

Returns the serial number of the RF downconverter module. Details

Device Information:Instrument Model

Returns a string that contains the model number or name of the RF device that you are currently using. Details

Device Information:Module Revision

Returns the revision of the RF downconverter module. Details

Device Information:Instrument Firmware Revision

Returns a string containing the firmware revision information of the RF downconverter for the composite device you are currently using. Details

Device Information:Preselector Present

Indicates whether a preselector is available on the RF downconverter module. Details

Device Information:RF Preamp Present

Indicates whether an RF preamplifier is available on the RF downconverter module. Details

Advanced:Preamp Enabled

Specifies whether the RF preamplifier is enabled in the system. Details

Advanced:Channel Coupling

Specifies whether the RF IN connector is AC- or DC-coupled on the downconverter. Details

Advanced:Downconverter Preselector Enabled

Specifies whether the tunable preselector is enabled on the downconverter. Details

Advanced:Mixer Level (dBm)

Specifies the mixer level, in dBm. Details

Advanced:Mixer Level Offset (dB)

Specifies the number of dB by which to adjust the device mixer level. Details

Advanced:RF Attenuation Step Size (dB)

Specifies the step size for the RF attenuation level. This value is expressed in dB. The actual RF attenuation is coerced up to the next highest multiple of the specified step size. If the mechanical attenuators are not available to implement the coerced RF attenuation, the solid state attenuators are used. Details

Advanced:OSP Delay Enabled

Specifies whether to enable the digitizer OSP block to delay Reference Triggers, along with the data samples, moving through the OSP block. Details

Advanced:Phase Offset

Specifies the offset to apply to the initial I and Q phases. Details

Advanced:FFT Width

Specifies the FFT width of the device. The FFT width is the effective bandwidth of the signal path during each signal acquisition. Details

Advanced:Cleaner Spectrum

Specifies how to obtain the lowest noise floor or faster measurement speed. Details

Advanced:IF Output Power Level Offset

Specifies the power offset by which to adjust the default IF output power level. This value is expressed in dB. Details

Advanced:Digitizer Dither Enabled

Specifies whether dithering is enabled on the digitizer. Details

Advanced:IF Filter Bandwidth (Hz)

Specifies the IF filter path bandwidth for your device configuration. Details

Advanced:Frequency Settling Units

Specifies the delay duration units and interpretation for LO settling. Details

Advanced:Frequency Settling

Specifies the value used for LO frequency settling. Details

Advanced:RF Highpass Filter Frequency (Hz)

Specifies the maximum corner frequency of the high pass filter in the RF signal path. The device uses the highest frequency high-pass filter option below or equal to the value you specify and returns a coerced value. Specifying a value of 0 disables high pass filtering silly. For multispan acquisitions, the device uses the appropriate filter for each subspan during acquisition, depending on the details of your application and the value you specify. In multispan acquisition spectrum applications, this property returns the value you specified rather than a coerced value if multiple high-pass filters are used during the acquisition. Details

Advanced:Subspan Overlap

Specifies the amount of overlap between consecutive subspans in a multispan spectrum acquisition. Overlapping subspans can reduce the power level of spurs in the acquired data. The value you specify determines the amount of shift as a percentage of subspan width. Details

Advanced:Downconverter Gain (dB)

Returns the net signal gain for the device at the current RFmx settings and temperature. RFmx scales the acquired I/Q and spectrum data from the digitizer using the value of this property. Details

Advanced:Amplitude Settling

Specifies the amplitude settling accuracy value. This value is expressed in decibels. RFmx waits until the RF power attains the specified accuracy level after calling the RFmx Initiate VI. Details

Advanced:Overflow Error Reporting

Configures error reporting for ADC and overflows occurred during onboard signal processing. Overflows lead to clipping of the waveform. Details

Advanced:Common Mode Level (V)

Specifies the common-mode level presented at each differential input terminal. The common-mode level shifts both positive and negative terminals in the same direction. This must match the common-mode level of the device under test (DUT). This value is expressed in Volts. Details

Advanced:SMU Resource Name

Specifies the resource name assigned by Measurement and Automation Explorer (MAX) for NI Source Measure Units (SMU) which is used as the noise source power supply for Noise Figure (NF) measurement, for example, PXI1Slot3, where PXI1Slot3 is an instrument resource name. SMU Resource Name can also be a logical IVI name. Details

Advanced:SMU Channel

Specifies the output channel to be used for noise figure (NF) measurement in RFmx. Details

Advanced:Optimize Path For Signal Bandwidth

Optimizes RF path for the signal bandwidth that is centered on the IQ carrier frequency. Details

Advanced:Input Isolation Enabled

Specifies whether input isolation is enabled. Details

Advanced:Thermal Correction Headroom Range (deg C)

Specifies the expected thermal operating range of the instrument from the self-calibration temperature returned from the Device Temperature property. This value is expressed in degree Celsius. Details

Recommended Settings:Acquisition Type

Returns the recommended acquisition type for the last committed measurement configuration.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:Center Frequency (Hz)

Returns the recommended center frequency of the RF signal. This value is expressed in Hz. Details

Recommended Settings:Number of Records

Returns the recommended number of records to acquire to complete measurement averaging.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:Trigger Min Quiet Time (s)

Returns the recommended minimum quiet time during which the signal level must be below the trigger value for triggering to occur. This value is expressed in seconds.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:IQ:Acquisition Time (s)

Returns the recommended acquisition time for I/Q acquisition, in seconds.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:IQ:Minimum Sample Rate (Hz)

Returns the recommended minimum sample rate for I/Q acquisition, in Hz.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:IQ:Pre Trigger Time (s)

Returns the recommended pretrigger time for I/Q acquisition, in seconds.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:Spectral:Acquisition Span (Hz)

Returns the recommended acquisition span for spectral acquisition, in Hz.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:Spectral:FFT Window

Returns the recommended FFT window type for spectral acquisition.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

Recommended Settings:Spectral:Resolution Bandwidth (Hz)

Returns the recommended FFT bin width for spectral acquisition. This value is expressed in Hz.

Note  This property is supported only when the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize VI is called with option string "AnalysisOnly=1".

Details

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