492/492P Service 1
C25/3S4 3-26-84
Add to the Adjustment Procedure, Page 3-52, after step e-3:
For instruments with Option 41, omit step e-4 and e-5.
Add to the Adjustment Procedure, Page 3-53, after step g-5:
h. For .instruments with Option 41, add the following:
1) Switch to Band 4 (5.4-18 GHz) and tune Center Frequency to
6 GHz. Set SPAN/DIV to 5 MHz.
2) Modulate the Comb Generator with 0.2 ϋ markers from the
time mark generator. 1
3) Adjust R1071 (Fig. 3-31) for 1 marker/division +0, - 1 ‘/. over
the center six divisions (30 Hz is no less than 6 divisions
or more than 6.06 divisions),
4) Tune the Center Frequency to 11 GHz and check span/div accu
racy. If necessary adjust R1071 so the span/div is within
specifications at both center frequencies.
5) Return the 492 FREQUENCY RANGE to band 1.
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