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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