Model 8640B
TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-24. OUTPUT LEVEL ACCURACY TEST (Complete) (Cont'd)
IF Attenuator
Test Generator
DVM Readings
(dB)
OUTPUT LEVEL
(mVdc)
40
-7 dBm
-500 (set)
30
-17 dBm
-472.0 - -529.6
20
-27 dBm
-472.0 - -529.6
10
-37 dBm
-472.0 - -529.6
0
-47 dBm
-472.0 - -529.6
12. Set the RF attenuator to 0 dB and the IF attenuator to 50 dB. use analyzer's display sensitivity controls to set the
DVM to the reading noted at the -47 dBm step, 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)
50
-47 dBm
Set level
40
-57 dBm
-445.6 - -561.0
13. Set the IF attenuator to 30 dB, OUTPUT LEVEL to -67 dBm, and then adjust the OUTPUT LEVEL vernier so that
the test Signal Generator's panel meter reads -67 dBm, then continue. The DVM should read -500 mVdc ± 1 dB.
IF Attenuator
Test Generator
DVM Readings
(dB)
OUTPUT LEVEL
(mVdc)
30
-67 dBm
-445.6 - -561.0
20
-77 dBm
-445.6 - -561.0
10
-87 dBm
-445.6 - -561.0
14. Set the IF attenuator to 0 dB, OUTPUT LEVEL to -97 dBm, and then adjust the OUTPUT LEVEL vernier so that
the test generator's panel meter reads -97 dBm. The DVM should read -500 mVdc ± 1 dB.
-445.6_____________-561.0 mVdc
4-34
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