Compensation (Hp 83630A/40A/50A Only) - Agilent Technologies 83620A Service Manual

b. Increment calibration constant #124, SRD Bias B; Band 7, to maximize
high end power. hen decrease the power by one third division

( 1/2 dB).
52. Repeat steps 49 through 51 until power is optimized over the full band.
53. Record the value of calibration constant #244, Y M O set; Band 7
.
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 49 through 52. Change calibration constant #244 back to its original
value.
Multi-band Amplifier/Multiplier Delay Compensation.
Power dropouts at the start of each band are typically removed
Note
with the Y M Risetime calibration constants. hese will be
adjusted later.
54. On the synthesizer, press:
START 2.0 GHz
5 5 5
STOP 20 GHz
5 5 5
SWEEP TIME 0 msec
5 5
he synthesizer intensity marker is set to identify the bandcross
Note
frequency (13.5 GHz). Reduce oscilloscope trace intensity
to identify the marker. You can also identify bandcrosses
by temporarily removing the cable from the Z-AXIS
BLANK/MKRS connector on the synthesizer rear panel. Make
sure this cable is connected when making adjustments.
55. On the synthesizer, press:
Marker M1
MARKER
5
56. Adjust calibration constant #172, Y M Bx Dly erm A3, to maximize
power at the low end of band 3 (adjust the lowest amplitude portion of the
band).
57. Adjust calibration constant #185, Y M Bx DLY erm B3 to maximize
power at the high end of band 3.
3-46 Adjustments
Amplifier/Multiplier Adjustments
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5
(start of band 3)
13.5 GHz
5 5
HP 8360