Model 8640B TM 9-4935-601-14-7&P
OPERATOR'S CHECKS
i. Slowly reduce OUTPUT LEVEL 10 to 200 mVOLTS; the meter 3 should autorange to the 0-3 SCALE when the
indicator passes approximately 3 on the 0-10 SCALE.
j. With OUTPUT LEVEL 1 set to 200 mVOLTS, the meter 3 should indicate 2 on the 0-3 SCALE. Slowly increase
OUTPUT LEVEL to 500 mVOLTS; the meter should autorange to the 0-10 SCALE when the indicator passes
approximately 3 on the 0-3 SCALE.
Amplitude Modulation
k. Set Meter Function 1 to AM and AM 23 to INT. Slowly turn Modulation 20 clockwise. When the meter indicates 10
(i.e., 100% modulation) set OUTPUT LEVEL 10 to +16 dBm; the REDUCE PEAK POWER annunciator 4 should
light.
Frequency Modulation
1. Set AM 23 to OFF (the annunciator should go out) and FM 15 to INT. Set Meter Function 1 to FM and check that
PEAK DEVIATION 16 is set to 5 kHz and the vernier is full counterclockwise; the meter 3 should indicate 0.
Figure 3-4. Operator's Checks (4 of 5)
3-10
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