A12 Assembly Potentiometer Locations - Agilent Technologies 83620A Service Manual

Figure 3-15. A12 Assembly Potentiometer Locations
19. Set calibration constant #227, Y M Gain; Band 3, to 2048.
20. Modify calibration constant #240, Y M O set; Band 3, to maximize low
end power. Power may peak twice. Adjust to the lower peak.
21. Adjust A12R25 B3S1 (see Figure 3-15) for maximum power at the
high end. he high end power may peak twice. If it does, adjust the
potentiometer to the lower peak (where the adjustment is furthest
counterclockwise).
22. Set the band 3 SRD bias calibration constants as follows:
a. Increment calibration constant #107, SRD Bias A; Band 3, to maximize
low end power. hen decrease the calibration constant value by 15
counts.
b. Increment calibration constant #120, SRD Bias B; Band 3, to maximize
high end power. hen decrease the power by one third division

( 1/2 dB).
23. Repeat steps 20 through 22 until power is optimized over the full band.
24. Record the value of calibration constant #240, Y M O set; Band 3
.
Step down the calibration constant in 100 count steps and verify that the
entire trace shifts down evenly. If the power change is not uniform, repeat
3-42 Adjustments
Amplifier/Multiplier Adjustments
All manuals and user guides at all-guides.com
HP 8360