Agilent Technologies HP 8566B Spécifications Page 326

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21. Frequency Response Adjustments
signal on the spectrum analyzer display. See Figure 3-90 for the
locations of
A6A12R63
5.8
GHz
and
A6AlOR18
VB.
Note
If
A6A12
YTX Driver Assembly is HP
P/N
85660-60235 (HP 85660AB
RF Sections serial number prefixed 2503A or above), and
A6A12R63
5.8
GHz
does not have sufficient adjustment range in this step (or
steps 61, 66, or
75),
check the value of factory-select component
A6A12R64.
The normal value of 15K ohms (HP
P/N
0698-7133) for
A6A12R64
provides sufficient adjustment range of
A6A12R63
5.8
GHz
for most
A6A8
YTX assemblies. The alternate value of 13.35613
ohms (HP P/N 0698-8079) for
A6A12R64
provides additional range
of
A6A12R63
5.8
GHz
in cases where the adjustment will otherwise
not peak the
A6A8
YTX tracking sufficiently. See Figure 3-90 for the
location of
A6Al2R64.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
On the synthesized sweeper, key in
Icw)
2.1
GHz.
Adjust 25-turn (YTX Drive) potentiometer
A6A12R66
2
GHz
as
necessary to maximize the amplitude of the 2.1
GHz
signal on
the spectrum analyzer display. See Figure 3-90 for the location
of
A6A12R66
2
GHz.
Repeat steps 57 through 60 as necessary until no further
adjustment is necessary.
On the synthesized sweeper, key in
Icw)
3.9
GHz.
On
the
spectrum analyzer, key in MARKER
C-J,
MARKER
(PEAK SEARCH) to position a marker at the peak of the displayed
3.9
GHz
signal. Adjust
17-turn
(Band B Step Gain) potentiometer
A6AlOR23
GB as necessary to adjust the amplitude of the
displayed 3.9
GHz
marker to -10.00
dBm
fO.10
dB.
Adjust
A6AlOR23
GB counterclockwise to increase the signal level, and
clockwise to decrease the signal level. If
A6AlOR23
GB does not
have sufficient range, adjust the amplitude of the displayed 3.9
GHz
marker as close as possible to -10.00
dBm.
See Figure 3-90
for the location of
A6AlOR23
GB.
On the spectrum analyzer, key in LOG SCALE
[
ENTER
dB/DIv)
2
dB,
MARKER
t-1.
On the synthesized sweeper, key in
Icw]
5.7
GHz.
On the spectrum analyzer, key in MARKER (PEAK SEARCH] to
position a marker at the peak of the displayed 5.7
GHz
signal.
Readjust 25-turn
(YT.X
Drive) potentiometer
A6A12R63
5.8
GHz
as necessary to maximize the amplitude of the 5.7
GHz
signal on
the spectrum analyzer display.
On the synthesized sweeper, key in
Icw)
2.1
GHz.
On the spectrum analyzer, key in MARKER (PEAK SEARCH) to
position a marker at the peak of the displayed 2.1
GHz
signal.
Readjust 25-turn (YTX Drive) potentiometer
A6A12R66
2
GHz
as
necessary to maximize the amplitude of the 2.1
GHz
signal on
the spectrum analyzer display.
Repeat steps 65 through 68 as necessary until no further
adjustment is necessary.
3-186 Adjustments
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