Band 4 Adjustment (Hp 83630A/40A/50A Only) - Agilent Technologies 83620A Service Manual

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steps 18 through 23. Change calibration constant #240 back to its original
value.

Band 4 Adjustment (HP 83630A/40A/50A only).

25. On the synthesizer, press:
START 20 GHz
5 5 5
STOP 26.5 GHz
5 5 5
26. See Figure 3-15 and set:
A12R23 B4BP1 fully clockwise.
A12R24 BP2 fully clockwise.
A12R26 B4S1 fully clockwise.
A12R27 S2 fully clockwise.
27. Set the oscilloscope vertical position as necessary to display the trace.
28. Modify calibration constant #241, Y M O set; Band 4, to maximize
power at the very low end. Power may peak twice. Adjust to the lower
peak.
29. Modify calibration constant #228, Y M Gain; Band 4, to maximize power
at the rst division on the display. Power may peak twice. Adjust to the
lower peak.
If there is no noticeable increase in power in the next two
Note
adjustments, leave the potentiometers at their preset position
(fully clockwise).
30. Adjust A12R26 B4S1 for maximum high-end power. Power may peak
twice. Adjust to the lower peak.
31. Adjust A12R23 B4BP1 for maximum power to optimize the 3rd through
the 7th divisions. Stop when the power begins to decrease. Power may
peak twice. Adjust to the lower peak.
32. Repeat step 30.
33. Adjust band 4 SRD bias calibration constants as follows:
a. Increment calibration constant #108, SRD Bias A; Band 4, to maximize
low end power. hen decrease the calibration constant value by 15
counts.
b. Increment calibration constant #121, SRD Bias B; Band 4, to maximize
high end power. hen decrease the power by one third division

( 1/2 dB).
34. Repeat steps 28 through 33 until the entire band is peaked.
HP 8360 Adjustments
Amplifier/Multiplier Adjustments
3-43