HP 8566B Adjustment Manual page 333

5 . 8 0 GHZ
105. On the spectrum analyzer, key in [FiQ 4, m and repeat
steps 100 through 102 as necessary.
106. On the spectrum analyzer, key in @ZZQ 5 and wait for the
sweep to complete (150 seconds) and the SWEEP LED to turn
Off.
107. On the spectrum analyzer, key in (RECALL) 4, m LGHz) / 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.
108. On the spectrum analyzer, key in (jj) 6, ISHIFT) IGHz) 1
and enter in the PRESELECTOR DAC setting from step 107.
Press SWEEP (-1 and wait for the sweep to complete (150
seconds) and the SWEEP LED to turn off.
109. Repeat steps 107 and 108 until the level of the lowest point on
the TRACE B waveform does not change. Repeat step 108 with a
PRESELECTOR DAC value of 30 and 34.
110. On the spectrum analyzer, key in TRACE B [VIEW), MARKER
lowest point on the TRACE B waveform. Then, press MARKER
[a, MARKER
the highest point on the TRACE B waveform. Note the total
peak-to-peak deviation of the displayed trace.
Band C total peak-to-peak deviation:
111. On the spectrum analyzer, press MARKER @i?ZZXj and note the
frequency of the highest point on the TRACE B waveform.
112. Repeat steps 105 through 111 if necessary until the total
peak-to-peak deviation of the TRACE B waveform is less than
2 1. Frequency Response Adjustments
I
3 MHZ
Figure 3-98.
)
to position a second marker on
SEARCH
Band C highest point:
I
I
Adjustments 3-l 93