150 Chapter2
Making Adjustments
24. Tracking Oscillator for Option 010
23.Set SRC TRACK ADJ to 350. This sets the tracking oscillator near the
center of its frequency range. (The relationship between the SRC
TRACK ADJ DAC number and the output frequency is nonlinear.)
Adjust SRC TRACK ADJ until the microwave frequency counter reads
Fcenter ±100 Hz.
24.Record the value of SRC TRACK ADJ in Table 2-9.
CAUTION A3A15C3 (TRK OSC CTR) is rated for a maximum of 10 adjustment
cycles. Due to this limitation, adjust TRK OSC CTR only when
absolutely necessary.
25.Adjust A3A15C3 (TRK OSC CTR) until the microwave frequency
counter reads 300 MHz ±500 Hz.
26.Repeat step 17 to step 24 at least once more until no further
adjustment of A3A15C3 is necessary.
27.Set the analyzer
LINE switch to off, then replace the screw removed
in step 17.
28.Reinstall the A3 RF Section assembly into the analyzer.
29.Replace the rear-panel jumper between the 10 MHz REF OUTPUT
and EXT REF IN connectors.
Table 2-9 Tracking Oscillator Range Centering
NF1
(MHz)
F2
(MHz)
Fcenter
(MHz)
SRC TRACK ADJ
Setting
1 ___________ ___________ _______________ ___________________________
2 ___________ ___________ _______________ ___________________________
3 ___________ ___________ _______________ ___________________________
4 ___________ ___________ _______________ ___________________________
5 ___________ ___________ _______________ ___________________________
6 ___________ ___________ _______________ ___________________________
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