Specifications

Programming Guide 2-53

ESG Family Signal Generators Programming Commands and Examples

:POWer Subsystem

RF Output Automatic Leveling Circuitry (ALC) Search State

:POWer:ALC:SEARch ON|OFF|1|0|ONCE

:POWer:ALC:SEARch?

This command toggles between the auto and manual modes of power search mode. The

choices are On (1) or Off (0). Power search is an internal calibration routine used to achieve

calibrated output power when the ALC is off. When you turn power search on, power

search will execute automatically with each change to the RF frequency or power, and also

with each change to the AM, burst, pulse, or I/Q modulation state. You do not need to

disconnect modulation inputs, however modulation is disabled during power search. If you

are using external I/Q modulation, the power search routine assumes that the I/Q input

level is = 0.5 V

rms

. Actual output amplitude will scale directly with . When

power search is set to Off, the power search routine is not run unless the command

[:SOURce]:POWer:ALC:SEARch ONCE is sent.

*RST Value: Off

RF Output Automatic Leveling Circuitry (ALC) Search Reference

:POWer:ALC:SEARch:REFerence FIXed|MODulated

:POWer:ALC:SEARch:REFerence?

This command lets you set either fixed or modulated modes of power search. Power search

is an internal calibration routine used to achieve calibrated power when the ALC is off.

Fixed power search mode uses a 0.5 volt reference. When you set the power search mode to

modulated, the current I/Q modulation remains active and the reference is the RMS value

of the current I/Q modulation.

*RST Value: Fixed

RF Output Automatic Leveling Circuitry (ALC) State

:POWer:ALC:STATe ON|OFF|1|0

:POWer:ALC:STATe?

This command sets the operating state of the signal generator’s RF output automatic

leveling circuitry. The choices are On (1) or Off (0).

*RST Value: On

I+Q