Agilent X-Series Signal Generators SCPI Command Reference 75
Basic Function Commands
Power Subsystem ([:SOURce]:POWer)
This command enables or disables the alternate amplitude.
NOTE: Alternate amplitude should not be selected for more than 100ms at a time or the power may
drift.
*RST
0
Key Entry Alt Ampl Off On
:ATTenuation
Supported All Models
[:SOURce]:POWer:ATTenuation <value><unit>
[:SOURce]:POWer:ATTenuation?
This command sets the signal generator’s attenuator level. Before setting the attenuator level, set the
“:ATTenuation:AUTO” function to Off which will disable ALC control.
In normal operation the attenuator level is selected by the signal generator’s automatic loop control
(ALC) which maintains the output power by adjusting internal circuits to compensate for any power
fluctuations due to drift, band changes, or load variations. In some applications, such as fast pulse,
the ALC may not respond quickly enough to compensate for the pulse rise times. In this case you can
set the attenuator and override any ALC adjustments.
The output power is the ALC level minus the attenuator setting. The attenuator is set in increments
of 5 dB.
Example
:POW:ATT 10DB
The preceding example sets the attenuator to 10 dB.
*RST +115
Range 0 to 115 dB
Key Entry Set Atten
:ATTenuation:AUTO
Supported All Models
[:SOURce]:POWer:ATTenuation:AUTO ON|OFF|1|0
[:SOURce]:POWer:ATTenuation:AUTO?
This command sets the state of the attenuator auto mode function.
ON (1) This selection allows the signal generator’s automatic level control (ALC) to adjust
the attenuator so that a specified RF power level, at the Agilent MXG’s RF output
connector, is maintained.
OFF (0) This choice allows for a user–selected attenuator setting that is not affected by the
signal generator’s ALC circuitry.
The OFF (0) selection can be used to eliminate power discontinuity normally
associated with attenuator switching during power adjustments.
*RST 1
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