HP 8566B Adjustment Manual page 338

2 1. Frequency Response Adjustments
3-199 Adjustments
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 A6AlOR27 GD does not have sufficient range,
change the value of factory-select component A6AlOR88. Increase
the value of A6AlOR89 to decrease the signal level, and decrease the
value of A6AlOR89 to increase the signal level. See Table 3-3 for the
acceptable range of values for A6AlOR89, and Table 3-4 for HP part
numbers. See Figure 3-90 for the location of A6AlOR89.
141. On the spectrum analyzer, key in
controls as follows:
START FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18.6 GHz
STOP FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 GHz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 dBm
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV
SWEEP TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 ms
142. On the synthesized sweeper, key in Icw 20.0 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.
143. Adjust 22-turn (IF Offset) potentiometer A6A12R82 E and
signal amplitude at 20.0 GHz on the spectrum analyzer display.
See Figure 3-90 for the locations of A6A12R82 E and A6AlOR95
VE.
144. On the spectrum analyzer, key in MARKER @?ZiZiJ,
[
MARKER
PEAK SEARCH
the displayed 20.0 GHz signal. Adjust Ill-turn (Band E Step
Gain) potentiometer A6AlOR29 GE as necessary to adjust the
amplitude of the displayed 20.0 GHz marker to -10.00 dBm
fO.10 dB. Adjust A6AlOR29 GE counterclockwise to increase
the signal level, and clockwise to decrease the signal level.
If A6AlOR29 GE does not
amplitude of the displayed 20.0 GHz marker as close as possible
to -10.00 dBm. See Figure 3-90 for the location of A6AlOR29
GE.
145. On the spectrum analyzer, key in LOG SCALE
146. Readjust 22-turn (IF Offset) potentiometer A6A12R82 E as
necessary to maximize the amplitude of the 20.0 GHz signal on
the spectrum analyzer display.
147. Set the synthesized sweeper controls as follows:
START FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18.6 GHz
STOP FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22.0 GHz
RF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
LEVELING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .XTAL
]
to position a marker at the peak of
have sufficient range, adjust the
C
2
ENTER