HP 8566B Adjustment Manual page 337

130.
On the spectrum analyzer, key in (j-1 4, (HOLD) and repeat
steps 126 through 128 as necessary.
131. On the spectrum analyzer, key in (ml 5 and wait for the
sweep to complete (150 seconds) and the SWEEP LED to turn
Off.
132. On the spectrum analyzer, key in (mj 4, m (GHz) / and
use the DATA knob to gradually change
setting from 32, maximizing the level of the TRACE A displayed
signal responses at the lowest point
Note the PRESELECTOR DAC setting.
133. On the spectrum analyzer, key in L-16, m IGHz) /
and enter in the PRESELECTOR DAC setting from step 132.
Press SWEEP (SINGLE_) and wait for the sweep to complete (150
seconds) and the SWEEP LED to turn off.
134. Repeat steps 132 and 133 until the level of the lowest point on
the TRACE B waveform does not change. Repeat step 133 with a
PRESELECTOR DAC setting of 30 and 34.
135. On the spectrum analyzer, key in TRACE B (VIEW), MARKER
lowest point on the TRACE B waveform. Then, press MARKER
the highest point on the TRACE B waveform. Note the total
peak-to-peak deviation of the displayed trace.
Band D total peak-to-peak deviation:
136. On the spectrum analyzer, press MARKER [NORMAL] and note the
frequency of the highest point on the TRACE B waveform.
137. Repeat steps 130 through 136 as necessary until the total
peak-to-peak deviation of the TRACE B waveform is less than
4.40 dB. See the TRACE B reference waveform to indicate which
portions of the frequency response waveform require relative
adjustment.
138. On the spectrum analyzer, key in (jj) 4, IHOLD).
On the synthesized sweeper, press Icw) and enter the frequency
139.
recorded in step 136, positioning the displayed TRACE A signal
response at the highest point on
The RF Section front-panel AMPTD CAL control should still be set to
the approximate center of its adjustment range from step 26.
140. On the spectrum analyzer, key in MARKER (j-1, MARKER
(
to position a marker at the peak of the displayed
PEAK
TRACE A signal response. Adjust 17-turn (Band D Step Gain)
potentiometer A6AlOR27 GD to adjust the amplitude of the
marker to -10.00 dBm + (l/2 of Band D total peak-to-peak
deviation) fO.O1 dB. Adjust A6AlOR27 GD counterclockwise to
increase the signal level, and clockwise to decrease the signal
level.
21. Frequency Response Adjustments
the PRESELECTOR DAC
on the TRACE B waveform.
)
to position a second marker on
SEARCH
Band D highest point:
the
TRACE B waveform.
Adjustments 3-197