Band 3 Adjustment; A12 Assembly Potentiometer Locations - Agilent Technologies 83620A Service Manual

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28. Disable the doubler, turn doubler amp mode o , and return the
synthesizer to continuous sweep if you are still in manual sweep.

Band 3 Adjustment.

29. On the synthesizer, set:
START 13.5 GHz
5 5 5
STOP 20 GHz
5 5 5
POWER LEVEL 25
5 5
30. Decrease the synthesizer power level until the level of the entire trace on
the oscilloscope begins to drop.
31. Set A12R108 B3S1 fully clockwise (see Figure 3-20).
here are two sets of potentiometers on the A12 assembly with
Note
identical names. Make
ones.
Figure 3-20. A12 Assembly Potentiometer Locations
32. Set calibration constant #623, Y F Gain; Band 3, to 2084.
33. Modify calibration constant #633, Y F O set; Band 3, to maximize low
end power.
34. Adjust A12R108 B3S1 (see Figure 3-20) for maximum power over the rest
of the sweep (3 to 10 divisions).
HP 8360
dBm
5
you are adjusting the correct
certain
Amplifier/Filter Adjustments
Adjustments 3-63