HP 8566B Adjustment Manual page 334

2 1. Frequency Response Adjustments
3-194 Adjustments
3.40 dB. See the TRACE B reference waveform to indicate which
portions of the frequency response waveform require relative
adjustment. 113. On the spectrum analyzer, key in (ml 4,
113. On the synthesized sweeper, press Icw) and enter
recorded in step 111, positioning the displayed TRACE A signal
response at the highest point on the TRACE B waveform.
The RF Section front-panel AMPTD CAL control should still be set to
the approximate center of its adjustment range from step 26.
114. On the spectrum analyzer, key in MARKER (j-1, MARKER
[ )
to position a marker at the peak of the displayed
PEAK SEARCH
TRACE A signal response. Adjust 17-turn (Band C Step Gain)
potentiometer A6AlOR25 GC to adjust the-amplitude of the '
marker to -10.00 dBm + (l/2 of Band C total peak-to-peak
deviation) f0.01 dB. Adjust A6AlOR25 GC counterclockwise to
increase the signal level, and clockwise to decrease the signal
level.
If A6AlO Miscellaneous Bias/Relay Driver Assembly is HP P/N
85660-60322 (HP 85660AB RF Sections with serial number prefix
2747A or above), and A6AlOR25 GC does not have sufficient range,
change the value of factory-select component A6AlOR88. Increase
the value of A6AlOR88 to decrease the signal level, and decrease the
value of A6AlOR88 to increase the signal level. See 'Ihble 3-3 for the
acceptable range of values for A6AlOR88, and 'Iable 3-4 for HP part
numbers. See Figure 3-90 for the location of A6AlOR88.
115. On the spectrum analyzer, key in
controls as follows:
START FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12.5 GHz
STOP FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.6 GHz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 dBm
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
SWEEP TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 ms
116. On the synthesized sweeper, key in @ 15.0 GHz.
The POWER LEVEL of the synthesized sweeper should still be leveled
to a calibrated -10.00 dBm at 100 MHz at the spectrum analyzer RF
INPUT from step 55.
117. Adjust 22-turn (IF Offset) potentiometer A6A12R83 D and
signal amplitude at 15.0 GHz on the spectrum analyzer display.
See Figure 3-90 for the locations of A6A12R83 D and A6AlOR15
VD.
118. On the spectrum analyzer, key in MARKER (NORMAL),
MARKER to position a marker at the peak of
the frequency
)
PEAK