HP 8340B Manual page 239

5-5.
20/30 LOOP PHASE LOCK, A36,
ASS, ASS,
A40, AND A43 (Cont'd)
64. Connect the Spectrum Analyzer
to
A38J1 (OUT
PLL1) IF. Set the Spectrum Analyzer controls as
follows:
INSTR PRESET
...................................................
Press
CENTER FREQ
......................... ....................
170
MHz
FREQ SPAN
..................................................
200
kHz
RES BW
.........................................................
3
kHz
VBW
.................................................
,....,
3
kHz
SWP
...........................................................
100 ms
REF LEVEL
......................................
.....-...,..„
-10 dBm
ATT
................................................. ...........
0 dB
SCALE/DIV
...................................................
10 dB/DIV
MARKER
......................................................
NORMAL
65. Disconnect the cable from
A36J2 (OUT 200
-
300 MHz)
and connect the cable to the Signal
Generator
using
a
BNC
to
SMB
snap-on test cable and adapter.
66. Adjust A38L11 (165
MHz NULL), A38L12 (160 MHz NULL), and A38L13 (170
MHz
NULL) fully
clockwise.
67. Set the Signal
Generator for
an
output
of 330.3 MHz
±0.2
MHz
at
0
dBm.
68. Adjust A38L13 (170 MHz NULL)
to null
the 170
MHz
signal on the Spectrum Analyzer.
69. Change the Signal Generator frequency
to
325.3
MHz ±0.2 MHz. Set the Spectrum Analyzer
CENTER FREQ
to
165
MHz.
70. Adjust A38L11
(165 MHz NULL)
to null
the 165
MHz signal on the Spectrum Analyzer.
71. Change the Signal Generator frequency
to 320.3
MHz
±
0.2 MHz.
Set the Spectrum Analyzer
CENTER FREQ
to
160 MHz.
72. Adjust A38L12 (160
MHz
NULL)
to
null
the 160 MHZ signal on
the Spectrum Analyzer
73. Set the Spectrum
Analyzer CENTER FREQ to 140
MHz. Tune
the Signal Generator to
300.3 MHz
±0.2
MHz.
Note the amplitude of the 140
MHz response on the Spectrum Analyzer.
74. Set the Spectrum Analyzer as
follows:
INSTR PRESET
...................................................
Press
START FREQ
...................................................
130
MHz
STOP FREQ
..................................................
170
MHz
MARKER
.....................................................
NORMAL
MARKER frequency
.............................................
140
MHz
Slowly tune the Signal
Generator from 320.3 to
326.3 MHz
while monitoring the display on the
Spectrum Analyzer.
75. The amplitude of the signal response between 160 and 166 (Signal Generator frequency of
320.3
to 326.3 MHz) should be at least 60 dB below the response at 140
MHz (Signal
Generator
fre¬
quency of 300.3 MHz)
noted in Step 73.
76.
Set the
LINE
switch to STANDBY.
Reinstall A38
(PLL1 IF)
in the instrument and reconnect
all the
cables.
HP 8340B/41B
Adjustments 5-35/5-36