HP 8566B Adjustment Manual page 340

2 1. Frequency Response Adjustments
marker. See Figure 3-90 for the locations of A6AlOR70 LB4
and A6AlOR76 LR4.
e. Readjust 22-turn (YTX Linearity) potentiometer A6AlOR76
LR4 clockwise to maximize the displayed signal responses at
the high end of the band.
f. Readjust A6A12R82 E and A6AlOR76 LR4 as necessary to
maximize the displayed signal responses from 18.6 GHz to
22.0 GHz on the spectrum analyzer display.
153.
Gradually readjust (Band E Lower Segment) A6AllR60 El
and (Band E Upper Segment) A6AllR78 E2 as necessary for
maximum flatness of the displayed signal responses.
154. On the spectrum analyzer, key in SWEEP
155.
Press SWEEP cm] on the spectrum analyzer and wait for the
sweep to complete (150 seconds) and
off. As the spectrum analyzer tunes from 18.6 GHz to 22.0 GHz,
the spectrum analyzer frequency response should be displayed as
TRACE B.
156. On the spectrum analyzer, key in ('14, IHOLD) and repeat
steps 152 through 154 as necessary.
157.
On the spectrum analyzer, key in (jjj 5 and wait for the
sweep to complete (150 seconds) and the SWEEP LED to turn
Off.
158. On the spectrum analyzer, key in [jJ 4, m [GHz) / and
use the DATA knob to gradually change the PRESELECTOR DAC
setting from 32, maximizing the level of the TRACE A displayed
signal responses at the lowest point on the TRACE B waveform.
Note the PRESELECTOR DAC setting.
159. On the spectrum analyzer, key in (j-1 6, [m] @ /
and enter in the PRESELECTOR DAC setting from step 158.
Press SWEEP (SINGLE) and wait for
seconds) and the SWEEP LED to turn off.
160. Repeat steps 158 and 159 until the level of the lowest point on
the TRACE B waveform does not change. Repeat step 159 with a
PRESELECTOR DAC value of 30 and 34.
161. On the spectrum analyzer, key in TRACE B (VIEW), MARKER
on
lowest point the TRACE B waveform. Then, press MARKER
(
PEAK SEARCH
the highest point on the TRACE B waveform. Note the total
peak-to-peak deviation of the displayed trace.
Band E total peak-to-peak deviation:
On the spectrum analyzer, press MARKER (j-1 and note the
162.
frequency of the highest point on the TRACE B waveform.
163. Repeat steps 156 through 162 if necessary until the total
peak-to-peak deviation of the TRACE B waveform is less than
5, LHOLD).
the SWEEP LED to turn
the
sweep to complete (150
)
to position a second marker on
Band E highest point:
]
SWEEP TIME