Instrument node for real-time Signal Studio products. Some parameters will vary by product.Instrument node displays a slightly different set of buttons and menus.5. Baseband (Advanced Real-time Signal Generation)
5. Baseband (Basic Single Satellite Waveform or Basic Multi-Satellite Waveform)
6. AUX IO Global Controls (Advanced Real-time Signal Generation)
6. Dual ARB Marker Utilities (Basic Single Satellite Waveform or Basic Multi-Satellite Waveform)
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Turns the application on, generating the real-time IQ signal in the connected instrument with the parameters you set in the software.
This button is only available when Advanced Real-time Signal Generation capability is selected. If you are using Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability, use the Download button (located in the toolbar) to download and play your waveform.
[:SOURce]:RADio:GNSS[:BBG][:STATe] 1|0|ON|OFF
[:SOURce]:RADio:GNSS[:BBG][:STATe]?
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Turns the application off, disabling the real-time IQ and RF signals on the connected instrument.
This button is only available when Advanced Real-time Signal Generation capability is selected.
[:SOURce]:RADio:GNSS[:BBG][:STATe] 1|0|ON|OFF
[:SOURce]:RADio:GNSS[:BBG][:STATe]?
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Updates the connected instrument with the current settings in the software's Instrument node window. This button is available only in the Instrument node window.
Coupling: When Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability is selected, this button is available only in the Instrument node window.
Retrieves the parameters from the connected instrument and updates the Instrument node settings.
Coupling: When Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability is selected, this button is available only in the Instrument node window.
Sets the signal generator to the factory-defined default state.
:SYSTem:PRESet
*RST
Coupling: When Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability is selected, this button is available only in the Instrument node window.
Performs a one to two second adjustment that is not traceable to a standard. However, it will minimize errors associated with offset voltages. This adjustment minimizes errors for the current instrument setting and at a single frequency. The DC adjustment is volatile and must be repeated with each instrument setting change.
:CALibration:IQ:DC
*OPC
Coupling: When Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability is selected, this button is available only in the Instrument node window.
Coupling:The ALC must be Off to use this feature.
Executes a manual power search calibration. This is an internal calibration routine that improves output power accuracy when the ALC is turned off. A power search is recommended for pulse-modulated signals with pulse-widths less than two microseconds.
[:SOURce]:POWer:ALC:SEARch ONCE
*OPC
Select the checkbox then click a parameter cell to display a brief description of the parameter.
When active, you can manually select an instrument model number. If Retrieve Instrument Model Number is set to , the model number of the connected instrument appears here after you run the System Configuration Wizard. The parameters that are available in the Instrument node are determined by the Instrument Model Number.
Range: for frequency range values, see the signal generator's data sheet
Enter a value to set the signal generator’s output frequency. Use abbreviations for faster entry (example: 1g = 1.000000000000 GHz).
[:SOURce]:FREQuency[:CW] <val><unit>
[:SOURce]:FREQuency[:CW]?
Range: for amplitude range values, see the signal generator's data sheet
Enter a value to set the signal generator’s output amplitude in dBm.
[:SOURce]:POWer[:LEVel][:IMMediate][:AMPLitude] <val><unit>
[:SOURce]:POWer[:LEVel][:IMMediate][:AMPLitude]?
Double-click or use the drop-down menu to turn the signal generator’s RF output or .
:OUTPut[:STATe] ON|OFF|1|0
:OUTPut[:STATe]?
Choice: Off | On
Default: Off
Double-click or use the drop-down menu to turn the I/Q adjustments or .
– The values entered for I Offset, Q Offset, and so on are applied to the I and Q signals.
– I/Q adjustment values are not applied to the I and Q signals.
[:SOURce]:DM:IQADjustment[:STATe] ON|OFF|1|0
[:SOURce]:DM:IQADjustment[:STATe]?
Range: –20% to 20%
Default: 0.00%
Enter a DC offset value to apply to the I signal before the I/Q modulator. Use this offset to remove imperfections in the in-phase signal or to introduce calibrated impairments.
When using this setting to minimize the LO feed-through signal, optimum performance is achieved when the adjustment is made after any other I/Q path adjustments. If other adjustments are made after minimization is performed, the LO feed-through signal may increase.
Set to to enable this parameter.
[:SOURce]:DM:IQADjustment:IOFFset <val><unit>
[:SOURce]:DM:IQADjustment:IOFFset?
Range: –20% to 20%
Default: 0.00%
Enter a DC offset value to apply to the Q signal before the I/Q modulator. Use this offset to remove imperfections in the quadrature-phase signal or to introduce calibrated impairments.
When using this setting to minimize the LO feed-through signal, optimum performance is achieved when the adjustment is made after any other I/Q path adjustments. If other adjustments are made after minimization is performed, the LO feed-through signal may increase.
Set to to enable this parameter.
[:SOURce]:DM:IQADjustment:QOFFset <val><unit>
[:SOURce]:DM:IQADjustment:QOFFset?
Range: –1 dB to 1 dB
Default: 0.000 dB
Enter a value to set the gain for the I signal relative to the Q signal.
Example: If you enter a value of 1 dB, the I signal will have 1 dB more amplitude than the Q signal.
Set to to enable this parameter.
[:SOURce]:DM:IQADjustment:GAIN[1] <val><unit>
[:SOURce]:DM:IQADjustment:GAIN[1]?
Range: –10 to 10 degrees
Default: 0.00 degrees
Enter a value to adjust the Q phase angle. When the quadrature skew is zero, the phase angle between the I and Q vectors is 90 degrees. Positive skew increases the angle from 90 degrees; negative skew decreases the angle from 90 degrees.
Set to to enable this parameter.
[:SOURce]:DM:IQADjustment:QSKew <val><unit>
[:SOURce]:DM:IQADjustment:QSKew?
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
This cell is grayed out and provides no function.
Choice: RF Output | Ext I/Q Output
Default: RF Output
optimizes the RF OUT path by applying calibration factors to only this path, leaving the I/Q OUT path uncalibrated.
Note: With External as the I/Q Source selection, the signal generator automatically optimizes both paths, so no optimization path selection is needed.
optimizes the I/Q OUT path by applying calibration factors to only this path, leaving the RF OUT path uncalibrated.
Note: With External as the I/Q Source selection, the signal generator automatically optimizes both paths, so no optimization path selection is needed.
This parameter is not available for all instrument model numbers and may be grayed out.
[:SOURce]:DM:CORRection:OPTimization RFOut|EXTernal
[:SOURce]:DM:CORRection:OPTimization?
Range: –500 ns to 500 ns
Default: 0.0 seconds
Enter a value to set the time delay between I and Q.
A positive value delays the I signal relative to the Q signal.
A negative value delays the Q signal relative to the I signal.
[:SOURce]:DM:IQADjustment:SKEW <val><unit>
[:SOURce]:DM:IQADjustment:SKEW?
Range: –250 ns to 250 ns
Default: 0.0 seconds
Enter a value to change the absolute phase of both I and Q with respect to triggers and markers. A positive value delays I and Q. This value affects both the external I/Q out signals and the baseband signal modulated on the RF output. This adjustment cannot be used with constant envelope modulation and does not affect external I/Q inputs.
The limits are determined by the rate of the current format.
[:SOURce]:DM:IQADjustment:DELay <val><unit>
[:SOURce]:DM:IQADjustment:DELay?
Choice: Off | On
Default: On
Double-click or use the drop-down menu to enable or disable the automatic level control.
– The ALC circuit constantly monitors and controls the output power level.
– No automatic leveling occurs.
[:SOURce]:POWer:ALC[:STATe] ON|OFF|1|0
[:SOURce]:POWer:ALC[:STATe]?
Choice: Auto | 200 Hz | 2 kHz | 20 kHz
Default: Auto
Double-click or use the drop-down menu to select an ALC bandwidth.
This parameter is not available for all instrument model numbers and may be grayed out.
[:SOURce]:POWer:ALC:BANDwidth|BWIDth:AUTO ON|OFF|1|0
[:SOURce]:POWer:ALC:BANDwidth|BWIDth:AUTO?
[:SOURce]:POWer:ALC:BANDwidth|BWIDth 200Hz|2kHz|20kHz
[:SOURce]:POWer:ALC:BANDwidth|BWIDth?
Choice: Fixed | Modulation | RMS
Default: Modulation
Double-click or use the drop-down menu to select one of the following reference signals when doing a power search.
– Power search uses a fixed 0.5 V reference.
– Power search uses the AC bias from the actual modulating signal.
– Power search uses a DC bias value equivalent to the value derived from the file header or the calculated value from the current I/Q data.
Set to to enable this parameter.
[:SOURce]:POWer:ALC:SEARch:REFerence RMS|FIXed|MANual|MODulated
[:SOURce]:POWer:ALC:SEARch:REFerence?
Choice: Normal | Minimum
Default: Normal
Double-click or use the drop-down menu to select the level of the output power control during a power search routine.
– Performs power searches without setting the internal step attenuator to its maximum setting. Glitches and power changes may be present during the search.
– Sets the signal generator's step attenuator to its maximum setting during power search to protect sensitive circuits.
Set to to enable this parameter.
[:SOURce]:POWer:PROTection[:STATe] ON|OFF|1|0
[:SOURce]:POWer:PROTection[:STATe]?
Choice: AUTO | PXI0 | .. | PXI7
Default: None
Double-click or use the drop-down menu to select a bus for ALC hold signal path on PXI backplane. This parameter is only available when connected to the M9381A.
This parameter is only available when Minor Enhancement Update (MEU) Option U01 or greater is valid.
Choice: : Off | HOLD | TRACK
Default: Off
Double-click or use the drop-down menu to select ALC mode. This parameter is only available when connected to the M9381A.
This parameter is only available when Minor Enhancement Update (MEU) Option U01 or greater is valid.
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Displays and sets the rate at which the selected waveform file is played from the baseband generator. This value is read from the file header, if the file has a header. If the file does not have a header, a default value of 100 MSa/s is used. The variable is expressed in terms of Msa/s.
[:SOURce]:RADio:GNSS[:BBG]:SAMPle:RATE <val>
[:SOURce]:RADio:GNSS[:BBG]:SAMPle:RATE?
Range: -60.00 to 0.00 dB
Default: 0.00 dB
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Adjusts the scaling of the I and Q data. Reducing the runtime scaling prevents over ranges from occurring. Runtime scaling is also used to scale signals relative to each other.
[:SOURce]:RADio:GNSS[:BBG]:RSCaling <val>
[:SOURce]:RADio:GNSS[:BBG]:RSCaling?
Range: -60 MHz to 60 MHz
Default: 0 Hz
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Moves the baseband signal above or below the carrier by the specified frequency. When simulating adjacent channel interferers, this allows you to offset the waveforms to avoid overlap between the waveforms.
[:SOURce]:RADio:GNSS[:BBG]:FREQuency:OFFSet <val>
[:SOURce]:RADio:GNSS[:BBG]:FREQuency:OFFSet?
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Identifies where the instrument gets the RMS voltage value of the signal to ensure the correct amplitude of the signal is at the output of the signal generator when the power calibration is performed.
[:SOURce]:RADio:GNSS[:BBG]:POWer:SOURce
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Power Meter Gating selects which method, Threshold or Marker, used to identify which waveform samples that are measured when determining the waveform's RMS voltage.
[:SOURce]:RADio:GNSS[:BBG]:POWer:PMGating
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Samples to Average specifies the number of samples that are averaged when calculating the RMS voltage for the subsequent power calibration.
[:SOURce]:RADio:GNSS[:BBG]:POWer:SAVerage
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Threshold defines the threshold voltage used to determine when the input waveform sample voltage measurement is used to determine the waveform's RMS voltage.
[:SOURce]:RADio:GNSS[:BBG]:POWer:THReshold
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Holdoff Count allows you to specify the number of consecutive input waveform samples that must meet or exceed the threshold voltage level before the input waveform sample is used to determine the waveform's RMS voltage. If the number of consecutive waveform samples is not met, the sample voltages are not used.
[:SOURce]:RADio:GNSS[:BBG]:POWer:HCOunt
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
The sample clock frequency of the signal generator is automatically calculated by the program. The range depends on the connected instrument.
Default: Internal
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the signal generator’s VCO Clock.
Internal − the signal generator uses its internal VCO Clock.
External − the signal generator uses an external VCO Clock.
This parameter is not available with all instrument model numbers and may be grayed out.
Range: 1% to 100%
Default: 70%
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Enter a scaling value for the signal generator to apply to the waveform while it is playing. Use scaling to get the best dynamic range without overflowing the I and Q digital to analog converters (DAC) and reduce the overshoot associated with the DAC interpolation filter.
Choice: Auto | 2.1 MHz | 40 MHz | Through
Default: Auto
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select a filter for I/Q signals modulated onto the RF carrier. The bandwidth of the baseband signal should dictate the minimum reconstruction filter bandwidth you choose. Depending on the oversampling ratio and where the image frequencies appear, you may want to select a wider bandwidth.
Auto − automatically selects a digital modulation filter.
2.1 MHz − applies a 2.1 MHz baseband filter to the I/Q signals.
40 MHz − applies a 40 MHz baseband filter to the I/Q signals.
Through − bypasses filtering.
This parameter is not available with all instrument model numbers and may be grayed out.
Choice: Auto | 40 MHz | Through
Default: Auto
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select a filter or through path for routing I and Q signals to the rear panel I/Q outputs.
Auto − automatically selects an I/Q output filter.
40 MHz − applies a 40 MHz baseband filter.
Through − bypasses filtering.
This parameter is not available with all instrument model numbers and may be grayed out.
Choice: Auto | Manual
Default: Auto
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the mode of the internal I/Q modulator.
Manual − manually set the attenuation level of the I/Q modulator using the Modulation Attenuation cell.
Auto − the attenuation level automatically sets to a value for best performance based on the digital modulation settings.
Range: 0.00 dB to 50 dB
Default: 10.00 dB
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Sets the attenuation of the I/Q signals being modulated through the signal generator RF path. Adjusting the attenuation may reduce signal distortion and improve the overall dynamic range.
Choice: On | Off
Default: Off
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to enable or disable the signal generator’s high crest mode.
On − processes high-crest-factor arbitrary I/Q waveforms with less distortion. For crest factors higher than 4 dB, you should reduce I/Q Modulation Atten levels by 1 dB for each dB above that level. High crest mode reduces the maximum output level and degrades power level accuracy.
Off − disables the high crest mode.
This parameter is not available with all instrument model numbers.
Choice: Internal | External
Default: Internal
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the signal generator’s ARB reference source.
Internal −the signal generator uses its internally generated 10 MHz signal as the reference source.
External − the signal generator uses an external signal as the reference frequency for the baseband I/Q signal. See the signal generator’s user’s guide for information on external references.
This parameter is not available with all instrument model numbers and may be grayed out.
Range: 0.250 MHz to 100 MHz
Default: 10 MHz
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Enter a frequency value when using an externally supplied reference signal. See the signal generator’s user’s guide for information on external references. Set ARB Reference to External to enable this parameter.
This parameter is not available with all instrument model numbers and may be grayed out.
Choice: Multiplexed | Dedicated
Default: Multiplexed
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Double-click or use the drop-down menu to select the AUX I/O port operating mode.
Multiplexed − configures the AUX I/O port operating mode to Multiplexed for real-time applications.
Dedicated − configures the AUX I/O port operating mode to Dedicated for real-time applications.
[:SOURce]:IQ:AUX:OPERating:MODE DEDicated|MULTiplexed
[:SOURce]:IQ:AUX:OPERating:MODE?
Choice: Free Run | User
Default: Free Run
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Double-click or use the drop-down menu to select the AUX I/O port input strobe. In Dedicated operating mode, the instrument will always be in Free Run mode. If Multiplexed mode is selected, either Free Run or User input strobe mode can be selected.
Free Run − new input data is latched based on an internal clock.
User − a user supplied strobe signal is used to latch data.
[:SOURce]:IQ:AUX:INPut:STRobe[:MODE] FREE|USER
[:SOURce]:IQ:AUX:INPut:STRobe[:MODE]?
Choice: Positive | Negative
Default: Positive
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Double-click or use the drop-down menu to select the polarity of the user external input strobe signal. This external input strobe signal must be at least 200 ns wide, and user must hold assert 16 input data bits stable 20 ns before the active edge of the user input strobe and hold the data stable for at least 100 ns after the active edge of the user input strobe.
Positive − a rising edge of the external strobe signal will latch the data.
Negative − a falling edge will latch the data.
[:SOURce]:IQ:AUX:INPut:STRobe:SLOPe POSitive|NEGative
[:SOURce]:IQ:AUX:INPut:STRobe:SLOPe?
Choice: Positive | Negative
Default: Positive
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Double-click or use the drop-down menu to select the polarity of the AUX output sample clock. This signal indicates that the 16 input data bits have been latched and will be output in both Free Run and external input strobe mode. The output pulse will be at least 200 ns wide.
Positive − a pulse with a rising edge will be asserted to indicate when the 16 input data bits have been latched.
Negative − a pulse with a falling edge will be asserted to indicate when the 16 input data bits have been latched.
[:SOURce]:IQ:AUX:OUTPut:STRobe:SLOPe POSitive|NEGative
[:SOURce]:IQ:AUX:OUTPut:STRobe:SLOPe?
Choice: None | Marker 1 | Marker 2 | Marker 3 | Marker 4
Default: None
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select an RF blanking function. Pulse/RF Blanking turns off the RF output signal during specific conditions determined by the marker.
– disables RF blanking.
through – selects a marker to activate RF blanking.
RF blanking incorporates ALC hold, so you do not need to select ALC hold when using RF blanking.
Do not blank longer than 100 ms to avoid exceeding the ALC hold limit.
Choice: None | Marker 1 | Marker 2 | Marker 3 | Marker 4
Default: None
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select a marker for ALC hold. Use ALC hold when you have a waveform signal that has idle periods, or when the increased dynamic range with RF blanking is not desired.
– disables ALC hold.
through – assigns a marker for the ALC hold function.
When the specified marker polarity is positive and the marker signal is low (no marker points), ALC hold is on, and the output power level does not respond to changes to the signal amplitude. When the marker signal is high, the ALC samples the waveform points and averages the waveform amplitudes to set the ALC circuitry for the next ALC hold period.
RF blanking incorporates ALC hold, so there is no need to select ALC hold when using RF blanking.
Limit ALC Hold to no more than 100 ms, as the ALC Level may degrade.
The hold selection remains until you reconfigure it, preset the signal generator, or cycle the signal generator power.
Incorrect ALC settings can cause a sudden unleveled condition to occur. An unleveled RF output can damage a DUT or connected instrument. Ensure that you set markers such that the ALC obtains a sample that accounts for the high power levels within the signal.
Choice: None | Marker 1 | Marker 2 | Marker 3 | Marker 4
Default: None
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select a marker for enabling the alternate amplitude function.
None – disables the alternate amplitude function.
through – assigns a marker for the alternate amplitude function.
When the specified marker polarity is positive and the marker signal is low (no marker points), alternate amplitude is off. When the marker signal is high, the alternate amplitude function is on.
Configure the alternate amplitude parameters from the Amplitude hardkey menu of the signal generator.
For more information about alternate amplitude and marker settings, refer to the signal generator's user's guide.
This parameter is not available for all instrument model numbers and may be grayed out.
Choice: Positive | Negative
Default: Positive
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the active polarity for Marker 1.
– the marker signal is high during the marker points.
– the marker signal is high during the period of no marker points.
Choice: Positive | Negative
Default: Positive
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the active polarity for Marker 2.
– the marker signal is high during the marker points.
– the marker signal is high during the period of no marker points.
Choice: Positive | Negative
Default: Positive
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the active polarity for Marker 3.
– the marker signal is high during the marker points.
– the marker signal is high during the period of no marker points.
Choice: Positive | Negative
Default: Positive
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the active polarity for Marker 4.
– the marker signal is high during the marker points.
– the marker signal is high during the period of no marker points.
Choice: Free Run | Trigger & Run
Choice (M9381A): Continuous | Single
Default: Free Run
Default (M9381A): Continuous
Coupling: In multiple-instrument configurations, the Trigger Type is set to Trigger and Run for all and cannot be changed
Double-click or use the drop-down menu to select the continuous mode and one of the following trigger responses.
Free Run − immediately triggers when you turn the format on.
Trigger & Run − waits for and starts on the first trigger; ignores subsequent triggers.
Continuous – selects the continuous triggering mode, which enables the instrument to repeat the modulating signal indefinitely until you turn off the modulation format, change triggers, or select another waveform.
Single – sets up a waveform to play once after receiving a trigger.
Choices for the M9381A PXIe VSG are only available for this parameter when Minor Enhancement Update (MEU) Option U01 or greater is valid.
The SCPI commands below do not apply to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability.
[:SOURce]:IQ:OUTPut:TRIGger:CONTinuous[:TYPE] FREE|TRIGger
[:SOURce]:IQ:OUTPut:TRIGger:CONTinuous[:TYPE]?
Choice: Trigger Key | External | Bus
Choice (M9381A): External | Bus
Default: External
Coupling: In multiple-instrument configurations, this parameter can only be changed on Instrument 1.
Adjusts the trigger source applied to the PATT TRIG IN or AUX I/O connectors.
Trigger Key − selects the front panel hardkey as the trigger source. After making this selection, press the Trigger hardkey to trigger a waveform.
External − enables you to trigger a waveform with an externally supplied trigger signal.
Bus − enables you to trigger a waveform by sending a command through the GPIB, LAN, or AUXILIARY IO (RS-232) input connector.
Choices for the M9381A PXIe VSG are only available for this parameter when Minor Enhancement Update (MEU) Option U01 or greater is valid.
The SCPI commands below do not apply to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability.
[:SOURce]:IQ:OUTPut:TRIGger:SOURce KEY|BUS|EXTernal
[:SOURce]:IQ:OUTPut:TRIGger:SOURce?
Choice: Pattern Trigger In 1 | Pattern Trigger In 2
Choice (M9381A): TRIG1 | PXI0 | PXI1 | PXI2 | PXI3 | PXI4 | PXI5 | PXI6 | PXI7
Default: Pattern Trigger In 1
Default (M9381A): PXI0
Selects the rear-panel connector for the external trigger source. This parameter is enabled only if external triggering is selected as the trigger source.
Pattern Trigger In 1 − selects the PATTERN TRIG IN rear-panel BNC connector
Pattern Trigger In 2 − selects the PATTERN TRIG IN 2 (AUXILIARY I/O) rear panel connector
For the M9381A PXIe VSG, double-click or use the drop-down menu to select the front-panel input for the external trigger signal. must be selected as the trigger source.
TRIG1 – selects the Trig 1 front-panel SMA connector as the external trigger input for the M9381A PXIe VSG
PXI0-PXI7 – selects the backplane bus signal for the M9381A PXIe VSG
Choices for the M9381A PXIe VSG are only available for this parameter when Minor Enhancement Update (MEU) Option U01 or greater is valid.
The SCPI commands below do not apply to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability.
[:SOURce]:IQ:OUTPut:TRIGger:EXTernal:SOURce EPT1|EPT2|EPTRIGGER1|EPTRIGGER2
[:SOURce]:IQ:OUTPut:TRIGger:EXTernal:SOURce?
Choice: Positive | Negative
Default: Negative
Sets the polarity of the external trigger. This parameter is active only if you select external (Ext) as the trigger source.
Positive − the signal generator triggers an event when it detects a rising edge on the PAT TRIG IN signal.
Negative − the signal generator triggers an event when it detects a falling edge on the PAT TRIG IN signal.
The SCPI commands below do not apply to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability.
[:SOURce]:IQ:OUTPut:TRIGger:EXTernal:POLarity POSitive|NEGative
[:SOURce]:IQ:OUTPut:TRIGger:EXTernal:POLarity?
Choice: On | Off
Default: Off
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Turns the external trigger delay off or on. This parameter is active only after selecting as the trigger source.
Range: 0 s to 41 s
Default: 0 s
Enter a value to set a delay time between when an external trigger is received and when it is applied to the signal.
The SCPI commands below do not apply to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform capability.
[:SOURce]:IQ:OUTPut:TRIGger:EXTernal:DELay <val>
[:SOURce]:IQ:OUTPut:TRIGger:EXTernal:DELay?
Choice: Free Run | Trigger & Run | Reset & Run
Default: Free Run
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the continuous mode and one of the following trigger responses.
– immediately triggers when you turn the format on.
– waits for and starts on the first trigger; ignores subsequent triggers.
– waits for and starts on the first trigger; resets and plays on a subsequent trigger.
Choice: Buffered Trigger | No Retrigger | Restart on Trigger
Default: Buffered Trigger
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the single mode and one of the following trigger responses.
– the waveform segment ignores triggers during playback
– causes a waveform to accept a trigger during playback and to restart after the current play finishes.
– causes a waveform to accept a trigger during playback and to restart immediately after receiving a trigger.
This parameter is not available for all instrument models and may be grayed out or not shown in GUI.
Choice: Single | Continuous
Default: Continuous
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the segment advance mode and one of the following trigger responses.
– causes a segment to play once and to wait for a trigger before the sequence advances to the next segment.
– causes a segment to play continuously until receiving another trigger. Upon receiving the trigger, the sequence advances to the next segment, which then plays continuously.
This parameter is not available for all instrument models and may be grayed out or not shown in GUI.
Choice: Active High | Active Low
Default: Active High
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to select the gated mode and one of the following trigger responses. To use the gated trigger mode, you must also select .
– causes waveform playback to start when the trigger signal goes low and to stop when the trigger signal goes high.
– causes waveform playback to start when the trigger signal goes high and to stop when the trigger signal goes low.
This parameter is not available for all instrument models and may be grayed out or not shown in GUI.
Choice: On | Off
Default: Off
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Double-click or use the drop-down menu to enable or disable the AWGN generator.
On − enables the AWGN.
Off − disables the AWGN.
[:SOURce]:IQ:OUTPut:IMPairments:AWGN[:STATe] ON|OFF|1|0
[:SOURce]:IQ:OUTPut:IMPairments:AWGN[:STATe]?
Choice: On | Off
Default: Off
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Double-click or use the drop-down menu to enable or disable adding real-time, non-repeating additive white Gaussian noise (AWGN) to the carrier being modulated by the waveform being played.
On − enables the addition of Real-time Noise.
Off − disables the addition of Real-time Noise.
Range: –100 dB to 100 dB
Default: 0 dB
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Enter a value to set the signal to noise ratio.
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNR <val>
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:SNR?
Range: –100 dB to 100 dB
Default: 0 dB
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Enter a value to set the noise power as a ratio of carrier power to noise power (C/N). Carrier power equals the total modulated signal power before noise is added. When you add noise, the power output from the signal generator does not change; it is the sum of carrier power and the added noise power.
Choice: Auto | Manual
Default: Auto
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Specifies the integration bandwidth is auto or manual.
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:IBWidth:AUTO ON|OFF|1|0
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:IBWidth:AUTO?
Range: 1.0 Hz to 200.000 MHz, the limits are affected by the instrument types and options.
Default: 4.000000 MHz
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Specifies the bandwidth over which the noise power is integrated for calculating the carrier to noise ratio.
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:IBWidth <val>
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:IBWidth?
Range: 1.0 Hz to 160.000 MHz, the limits are affected by the instrument types and options.
Default: 4.000000 MHz
Coupling: Available only when capability is set to Advanced Real-time Signal Generation.
Enter a value to set the flat noise bandwidth, which is typically set wider than the carrier bandwidth.
This parameter is not available for all instrument model numbers and may be grayed out.
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:BANDwidth|BWIDth <val>
[:SOURce]:IQ:OUTPut:IMPairments:AWGN:BANDwidth|BWIDth?
Range:
N5172B/N5182B: 1.0 Hz to 200 MHz
N5182A: 1.0 Hz to 125 MHz
E4438C/E8267D: 1.0 Hz to 80 MHz
Default: 1.0 Hz
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Specifies the bandwidth over which the noise power is integrated for calculating the carrier to noise ratio (the bandwidth of the target carrier). Also, the maximum upper range is limited to Base Sampling Rate x OSR before download is finished.
Range: 1 to 2
Default: 1
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Displays the flat noise bandwidth factor for the applied real-time noise.
When the Sample Clock is < 50 MHz, the Noise Bandwidth Factor adjusts the RF flat noise bandwidth to be either at least 0.8 times the sample rate for a bandwidth factor of 1, or 1.6 times the sample rate if the bandwidth factor is 2.
When the Sample Clock is > 50 MHz, noise cannot be enabled if the Noise Bandwidth Factor is 2. Any oversampling in a waveform will effectively make the noise bandwidth that many times wider than the signal bandwidth.
The Noise Bandwidth is calculated as follows:
The noise bandwidth is at least 0.8 * [ARB Sample Clock] * [Noise Bandwidth Factor]
This parameter is not available for all instrument model numbers and may be grayed out.
Range: 1 Hz to 160.000 MHz
Default: 1.000 Hz
Coupling: Available only when capability is set to Basic Single Satellite Waveform or Basic Multi-Satellite Waveform.
Set or change the noise bandwidth.
This parameter is not available for all instrument model numbers and may be grayed out.
