8 ) The 492P, if used with an external controller, requires
adjustment of the Fine Tune Sensitivity R3040. A con
troller is required to make this adjustment. See Alter
nate Procedure for 492P; otherwise, R3040 should
remain centered.
c. Adjust Identify Offset as follows:
Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Adjustment Procedure
1) Apply 1 /is markers to the RF INPUT and set the
FREQ SPAN/DIV to 500 kHz;
2) Tune the FREQUENCY to 5 MHz then center one of
the 1 μβ markers on screen.
3) Activate the IDENTIFY 500 kHz/ONLY mode;
4) Adjust Coarse Tune Sensitivity R1028 (Fig. 3-33) on
the Center Frequency Control board so that, on alter
nate sweeps, the signals align horizontally with each
other.
Time Mark
Generator
0 I
492 Spectrum Analyzer
10 ns marker
2nd LO
RF Input
Counter
□ □ □ □ □ □ .
□ □ □ □ □ □ · * ·
□ □ □ □ □ □ - -
□ □ O Q
A. Test equipment setup for check and adjustment of 1st and 2nd LO frequency.
B. Tuning adjustment on the 2nd LO.
Fig. 3-32. Test equipment setup for check and adjustment of 1 st and 2nd LO frequencies.
3-54
REV FEB 1983
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