Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-24. OUTPUT LEVEL ACCURACY TEST (Complete) (Cont'd)
15. Set the IF attenuator to 30 dB and use analyzer's display sensitivity controls to set the DVM to the reading noted
in step 14, then continue. The DVM should read -500 mVdc ± 1 dB. If necessary, use test generator's OUTPUT
LEVEL vernier to reset panel meter to +3 dB.
IF Attenuator Test Generator DVM Readings
(dB) OUTPUT LEVEL (mVdc)
30 -97 dBm Set level
20 -107 dBm -445.6 - -561.0
10 -117 dBm -445.6 - -561.0
0 -127 dBm -445.6 - -561.0
16. Set the IF attenuator to 20 dB and use analyzer's display sensitivity controls to set the DVM to the reading noted
at the -127 dBm step above, then continue. The DVM should read -500 mVdc ± 1 dB. If necessary, use test
generator's OUTPUT LEVEL vernier to reset panel meter to +3 dB.
IF Attenuator Test Generator DVM Readings
(dB) OUTPUT LEVEL (mVdc)
20 -127 dBm Set level
10 -137 dBm -445.6 - -561.0
17. Set the IF attenuator to 0 dB and adjust the OUTPUT LEVEL vernier so that test Signal Generator's panel meter
reads 0.013 pV (-144.75 dBm). The DVM should read --650 mVdc ± 1.5 dB.
-546.9________________-772.5 mVdc
18. Verify the test accuracy by increasing the RF attenuator by 10 dB. The DVM should drop below --300 mVdc. If it
does not, check the test setup for RF leakage paths.
19. Check output level accuracy at other output frequencies by setting the two generators for a 3 MHz difference
frequency and repeating steps 1 through 18.
4-35
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