Am Delay - Agilent Technologies 83620A Service Manual

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17. AM Delay

Description and Procedure
In the ALC loop, the integrator input from the ALC detector is delayed (phase
shifted from the reference input) through the ALC modulator, RF path, and
ALC detector. Because of this, amplitude modulation can peak the AM
frequency response. In this adjustment, you set the delay in the reference input
equal to the delay in the input from the ALC detector.
he synthesizer is set to maximum leveled power at a CW frequency, with
amplitude modulation at the maximum rate. Monitoring the IN LVL signal
(the integrator output), adjust the AM DELAY to minimize any AC voltage
present.
1. Preset the instruments shown in Figure 3-30 and let them warm up for at
least one hour.
Figure 3-30. AM Delay Adjustment etup
3-106 Adjustments HP 8360
AM Delay