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21. Frequency Response Adjustments
signal on the spectrum analyzer display. See Figure 3-90 for the
locations of
5.8
and
VB.
If
YTX Driver Assembly is HP
85660-60235 (HP
RF Sections serial number prefixed 2503A or above), and
5.8
does not have sufficient adjustment range in this step (or
steps 61, 66, or
check the value of factory-select component
The normal value of 15K ohms (HP
0698-7133) for
provides sufficient adjustment range of
5.8
for most
YTX assemblies. The alternate value of 13.35613
ohms (HP P/N 0698-8079) for
provides additional range
of
5.8
in cases where the adjustment will otherwise
not peak the
YTX tracking sufficiently. See Figure 3-90 for the
location of
5 9 .
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
On the synthesized sweeper, key in
2.1
Adjust 25-turn (YTX Drive) potentiometer
2
as
necessary to maximize the amplitude of the 2.1
signal on
the spectrum analyzer display. See Figure 3-90 for the location
of
2
Repeat steps 57 through 60 as necessary until no further
adjustment is necessary.
On the synthesized sweeper, key in
3.9
On
the
spectrum analyzer, key in MARKER
MARKER
(
PEAK SEARCH
)
to position a marker at the peak of the displayed
3.9
signal. Adjust
(Band B Step Gain) potentiometer
GB as necessary to adjust the amplitude of the
displayed 3.9
marker to -10.00
fO.10
Adjust
GB counterclockwise to increase the signal level, and
clockwise to decrease the signal level. If
GB does not
have sufficient range, adjust the amplitude of the displayed 3.9
marker as close as possible to -10.00
See Figure 3-90
for the location of
GB.
On the spectrum analyzer, key in LOG SCALE
[
ENTER
2
MARKER
On the synthesized sweeper, key in
5.7
On the spectrum analyzer, key in MARKER
(
PEAK SEARCH
] to
position a marker at the peak of the displayed 5.7
signal.
Readjust 25-turn
Drive) potentiometer
5.8
as necessary to maximize the amplitude of the 5.7
signal on
the spectrum analyzer display.
On the synthesized sweeper, key in
2.1
On the spectrum analyzer, key in MARKER
(
PEAK SEARCH
) to
position a marker at the peak of the displayed 2.1
signal.
Readjust 25-turn (YTX Drive) potentiometer
2
as
necessary to maximize the amplitude of the 2.1
signal on
the spectrum analyzer display.
Repeat steps 65 through 68 as necessary until no further
adjustment is necessary.
3-186 Adjustments
Содержание HP 8566B
Страница 71: ......
Страница 137: ...Test 19 1st LO Output Amplitude Steps Min Measured Max 4 1st LO OUTPUT Level 5 dBm 2 112 Performance Tests ...
Страница 169: ......
Страница 344: ......
Страница 351: ...23 Track and Hold Adjustments 25 Repeat steps 4 through 24 until no further adjustments are required Adjustments 3 211 ...
Страница 404: ...AIVI Wi AlAl ti2 W8 Figure 6 6 IF Section Front View 6 8 Major Assembly and Component locations ...