Band 5 Adjustment (Hp 83640A/50A Only) - Agilent Technologies 83620A Service Manual

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b. Set the oscilloscope vertical position as necessary to display the trace.
c. On the synthesizer, set:
SWEEP
MENU
5
d. Using the synthesizer rotary knob, nd the peak of the sweep as
displayed by the oscilloscope.
e. If the power level of the peak point is greater than 23.5 dBm, as
displayed on the power meter, decrease DAmp Clamp 4 until the power
level is less than these values.
If the power level of the peak point is already less than these values,
set the synthesizer back to continuous sweep and decrease DAmp
Clamp 4 just until the peak point begins to drop (this indicates that
power to the bridge detector is clamped).
57. Disable the doubler, turn doubler amp mode o , and return the
synthesizer to continuous sweep if you are still in manual sweep.

Band 5 Adjustment (HP 83640A/50A only).

58. On the synthesizer set:
START 26.5 GHz
5 5 5
STOP 33.4 GHz
5 5 5
POWER LEVEL 25
5 5
59. Set the oscilloscope vertical position as necessary to display the trace.
60. Decrease the synthesizer power level until the level of the entire trace on
the oscilloscope begins to drop.
61. Modify calibration constant #625, Y F Gain; Band 5, to maximize high
end power.
62. Modify calibration constant #635, Y F O set; Band 5, to maximize low
end power.
63. Repeat steps 61 and 62 until the entire band is peaked.
64. Note the value of calibration constant #635, Y F O set; Band 5
.
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 61 through 63 until it is. hen change calibration constant #635
back to the recorded value.
65. On the synthesizer, set:
POWER LEVEL 0
5 5
HP 8360
(asterisk on)
Manual weep
dBm
5
dBm
5
Amplifier/Filter Adjustments
Adjustments 3-67