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2 1. Frequency Response Adjustments
set to internal leveling, which introduces minor leveling errors but
permits much faster sweep times.
40. Repeat steps 33 through 39 as necessary until the total
peak-to-peak deviation of the TRACE B waveform is less than
1.20
Leave the TRACE B reference waveform in VIEW for
steps 33 through 36 to indicate which portions of the frequency
response waveform require relative adjustment.
If necessary,
change the
value of factory-select component
to shift the Band A frequency breakpoint determining
the adjustment ranges of
Al and
A2. A
decrease in the value of
shifts
the
Band A frequency
breakpoint higher in frequency, widening
the
Band A Lower
Segment and narrowing the Band A Upper Segment. Conversely,
an increase in the value of
shifts the Band A
frequency breakpoint lower in frequency. See
3-3 for the
acceptable range of values for
and
3-4 for HP
part numbers. See Figure 3-90 for the location of
41. On the synthesized sweeper, key in
100 MHz,
LEVELING.
42. On the spectrum analyzer, key in
8, MARKER
[
PEAK SEARCH
)
to position a marker on the peak of the displayed
100 MHz signal.
43.
44.
45.
With the RF Section front-panel AMPTD CAL control still set to
the approximate center of its adjustment range, readjust 17-turn
potentiometer (Band A Step Gain)
GA to adjust the
amplitude of the displayed 100 MHz marker to -10.00
fO.O1
Adjust
GA counterclockwise to increase the
signal level, and clockwise to decrease the signal level.
For
Miscellaneous Bias/Relay Driver Assembly, HP
85660-60322 (HP
RF Sections with serial number prefix
2747A or above):
If
GA does not have sufficient range to adjust the
amplitude of the 100 MHz displayed signal to -10.00
change the value of factory-select component
Increase the value of
to decrease the signal level, and
decrease the value of
to increase the signal level. See
Table 3-3 for the acceptable range of values for
and
3-4 for HP part numbers. See Figure 3-90 for the location
of
On the synthesized sweeper, key in
LEVELING, RF (OFF).
Disconnect the power splitter from the spectrum analyzer RF
INPUT.
On the power meter, press
HOLD
]
(turning it off).
Disconnect the power meter rear panel RECORDER OUTPUT
from the synthesized sweeper front panel LEVELING EXT
INPUT.
Adjustments
83