Band 2 Adjustment - Agilent Technologies 83620A Service Manual

5. On the oscilloscope, set:
Channel A:
Volts/Division:
Offset:
Input Coupling:
Input Impedance: 1 M
Channel B
Volts/Division:
Offset:
Input Coupling:
Input Impedance: 1 M
weep Mode:
Adjust Channel B o set, volts/division, and horizontal position controls for
a trace that lls the full horizontal display. Adjust the vertical position
with the A vertical position control.
6. Make certain that calibration constant #131, Squegg Clamp 1A, is set to
255. hen adjust A12R69, Y MG, to maximize high end power (last two
horizontal display divisions).
7. Modify calibration constant #238, Y M O set; Band 1, to maximize low
end power.
8. Repeat steps 6 and 7 until the entire band is peaked.
9. Record the value of calibration constant #238, Y M O set; Band 1
.
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
steps 6 through 8 again. Change calibration constant #238 back to its
original value.

Band 2 Adjustment.

10. On the synthesizer, press:
START 7 GHz
5 5 5
STOP 13.5 GHz
5 5 5
11. Set the oscilloscope vertical position as necessary to display the trace.
12. Modify calibration constant #226, Y M Gain; Band 2, to maximize high
end power. he high end power may peak twice. If it does, adjust the
3-40 Adjustments
Amplifier/Multiplier Adjustments
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5 mV/Division
As required
DC
1 V/Division
As required
DC
A versus B
HP 8360