Agilent Technologies 83620A Service Manual page 310

48. Adjust A12R109 B4S1 for maximum high-end power.
49. Adjust A12R105 B4BP1 for maximum power to optimize the 3rd through
the 7th divisions. Stop when the power begins to decrease.
50. Repeat step 47.
51. Repeat steps 41 through 48 until the entire band is peaked.
52. Record the value of calibration constant #634, Y M O set; Band 4
.
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 46 through 51 until it is. hen change calibration constant #634
back to the recorded value.
53. On the synthesizer, set:
POWER LEVEL 0
5 5
54. Adjust calibration constant #134, Squegg Clamp 4A, to maximize RF
output power across the band.
55. For the HP 83630A only, adjust calibration constant #134,
Squegg Clamp 4A as described here, to protect the bridge detector from
excessive power:
a. Set the oscilloscope vertical position as necessary to display the trace.
b. On the synthesizer, set:
SWEEP
MENU
5
c. Using the rotary knob, nd the peak of the sweep as displayed by the
oscilloscope.
d. If the power level of the peak point is greater than 18.9 dBm, as
displayed on the power meter, decrease Squegg Clamp 4A until the
power level is less than these values.
If the power level of the peak point is already less than these
values, return the synthesizer to continuous sweep and decrease
Squegg Clamp 4A just until the peak point begins to drop
(this indicates that power to the bridge detector is clamped).
56. For the HP 83640A/50A only, adjust calibration constant #452,
DAmp Clamp 4 as described here, to protect the bridge detector from
excessive power while in doubler amp mode:
a. On the synthesizer, set:
Tools Menu Disable Doubler
SERVICE
5
POWER
MENU
5
3-66 Adjustments
Amplifier/Filter Adjustments
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dBm
5
(asterisk on)
Manual weep
Dblr Amp Menu Doubler Amp Mode On
(asterisk o )
(asterisk on)
HP 8360