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

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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 22.3 dBm, as
displayed on the power meter, decrease DAmp Clamp 3 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 3 just until the peak point begins to drop (this indicates that
power to the bridge detector is clamped).
41. Disable the doubler, turn doubler amp mode o , and return the
synthesizer to continuous sweep if you are still in manual sweep.

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

42. On the synthesizer, set:
START 20 GHz
5 5 5
STOP 26.5 GHz
5 5 5
POWER LEVEL 25
5 5
43. Decrease the synthesizer power level until the level of the entire trace on
the oscilloscope begins to drop.
44. Set the following potentiometers, located on the left side of the board,
fully clockwise:
A12R109 B4S1
A12R110 S2
A12R105 B4BP1
A12R106 BP2
45. Set the oscilloscope vertical position as necessary to display the trace.
46. Modify calibration constant #634, Y F O set; Band 4, to maximize low
end power.
47. Modify calibration constant #624, Y F Gain; Band 4, to maximize power
at the rst division on the display.
If there is no noticeable increase in power in the next two
Note
adjustments, leave the potentiometers at their preset position
(fully clockwise).
HP 8360
(asterisk on)
Manual weep
dBm
5
Amplifier/Filter Adjustments
Adjustments 3-65