Agilent Technologies 83620A Service Manual page 330

12. Modulator Offset and Gain
Description and Procedure
In this procedure, the ALC modulation o set and gain calibration constants
are adjusted to linearize the ALC modulator response to the ALC power
level reference voltage. Default values are entered for the modulator o set
calibration constants and internal rmware is activated to set the modulator
gain calibration constants. he synthesizer is then set for a power sweep across
the entire leveled ALC range (
integrator level signal on the ALC board is monitored to verify linearity.
If necessary, the modulator o set values are modi ed.
1. Connect the equipment as shown in Figure 3-23. Preset the instruments
and let them warm up for at least one hour.
Figure 3-23. Modulator Offset and Gain Adjustment etup
Digitizing Oscilloscope
Oscilloscope Probes
3-86 Adjustments
Modulator Offset and Gain
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20 to the maximum leveled power). he
Equipment
HP 54111D
HP 10431A
HP 8360