HP 8340B Manual page 146

5-5. 20/30 LOOP PHASE LOCK, A36, A38, A39, A40, AND A43 (Cont'd)
64. Connect the Spectrum Analyzer to A38J1 (OUT PLLi) IF. Set the Spectrum Analyzer controls as
follows:
INSTR PRESET
CENTER FREQ
FREQ SPAN
RESBW
VBW
SWP
REF LEVEL
ATT
SCALE/DIV
MARKER
Disconnect the cable from
65.
Generator using a BNC to SMB snap-on test cable and adapter.
Adjust A38L1i (165 MHz NULL), A38Li2 (160 MHz NULL), and A38L13 (170
66.
clockwise.
Set the Signal Generator for an output of 330.3 MHz ±0.2MHz at 0 dBm.
67.
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 ±0.2MHz. Set the Spectrum Analyzer
CENTER FREQ
70. Adjust A38L11 (165 MHz NULL) to null the 165 MHz signal on the Spectrum Analyzer.
7i. Change the Signal Generator frequency to 320.3 MHz
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
STARTFREQ
STOP FREQ
MARKER
MARKER frequency
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
A36J2 (OUT 200 - 300
to 165 MHz.
MHz) and connect the cable to the Signal
Set the Spectrum Analyzer
±0.2 MHz.
Adjustments
Press
MHz
i70
kHz
200
3kHz
3kHz
lOOms
lOdBm
0dB
10 dB/DIV
NORMAL
MHz NULL) fully
Press
130MHz
170 MHz
NORMAL
140 MHz
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