72 Agilent X-Series Signal Generators SCPI Command Reference
Basic Function Commands
Power Subsystem ([:SOURce]:POWer)
Key Entry Power Meter Servo mode overshoot protection increment threshold
:ALC[:STATe]
Supported All Models
[:SOURce]:POWer:ALC[:STATe] ON|OFF|1|0
[:SOURce]:POWer:ALC[:STATe]?
This command enables or disables the automatic leveling control (ALC) circuit. The query returns the
current state of the ALC.
*RST 1
Key Entry ALC Off On
Remarks The purpose of the ALC circuit is to hold output power at a desired level by
adjusting the signal generator’s power circuits to compensate for power drift.
Power drift occurs over time and changes in temperature. Refer to the User’s
Guide for more information on the ALC.
:ALC:TRANsition:REFerence
Supported N5172B/82B
[:SOURce]:POWer:ALC:TRANsition:REFerence RMS|MODulated|NBModulated
[:SOURce]:POWer:ALC:TRANsition:REFerence?
This command determines the ALC settling mode during frequency transitions when the IQ
modulator is on.
RMS This choice is the default behavior. The IQ is set to an idle state and a CW only
signal plays during frequency transitions.
Mod This choice leaves the IQ on during frequency transition and also leaves the ALC
in the default wide bandwidth mode for fast switching.
Although this choice results in switching times that are equivalent to RMS mode,
there is the possibility of leveling at the wrong power level.
NBMod This choice leaves the IQ on during frequency transitions but sets the ALC
bandwidth to a narrow bandwidth. Doing this increases the switching time but
allows for a more accurate amplitude level.
*RST RMS
Key Entry ALC Transition Reference RMS Mod NBMod
Remarks RMS is the default behavior and in most cases is the best choice for this setting.
Refer to the User’s Guide for more information on the ALC.
:ALCHold:EXTernal:SOURce
Supported All Models
:ALCHold:EXTernal:SOURce TRIGger[1]|TRIGger2|PULSe
:ALCHold:EXTernal:SOURce?
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