124 Agilent N5181A/82A MXG Signal Generators SCPI Command Reference
Analog Modulation Commands
Frequency Modulation Subsystem–Option UNT ([:SOURce])
Frequency Modulation Subsystem–Option UNT ([:SOURce])
:FM:EXTernal:COUPling
Supported All Models with Option UNT
[:SOURce]:FM:EXTernal:COUPling AC|DC
[:SOURce]:FM:EXTernal:COUPling?
This command sets the coupling for the frequency modulation source through the selected external
input connector.
Use this command with the “:DCFM” on page 60 to remove the effects of DC and optimize the DCFM
calibration.
AC This choice only passes ac signal components.
DC This choice passes both ac and dc signal components.
*RST DC
Key Entry Ext Coupling DC AC
Remarks The command does not change the currently active source or switch the current
modulation on or off. The modulating signal may be the sum of several signals,
either internal or external sources.
:FM:INTernal:FREQuency
Supported All Models with Option UNT
[:SOURce]:FM:INTernal:FREQuency <value><unit>|UP|DOWN
[:SOURce]:FM:INTernal:FREQuency?
This command sets the internal frequency modulation rate for the following applications:
• the start frequency for a swept- sine waveform
• the frequency rate for all other waveforms
*RST +4.00000000E+002
:FM:INTernal:FREQuency:STEP[:INCRement]
Supported All Models with Option UNT
[:SOURce]:FM:INTernal:FREQuency:STEP[:INCRement] <num>
[:SOURce]:FM:INTernal:FREQuency:STEP[:INCRement]?
This command sets the step increment for the internal frequency modulation.
The variable <num> sets the entered value in units of Hertz.
*RST +5.00000000E+002
Range All Waveforms: 0.1 Hz–2 MHz
Key Entry FM Rate
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