Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-23. OUTPUT LEVEL ACCURACY TEST (Abbreviated) (Cont'd)
9. Set step attenuator to 0 dB; set spectrum analyzer's vertical scale log reference level to -20 dBm.
Adjust vertical scale log reference vernier to give the same level, with respect to the center (reference) graticule
line, as the last recorded entry on the previous table.
10. Set Signal Generator and analyzer controls as shown in the following table. The amplitude levels should be
within the specified tolerances. If necessary, use generator's OUTPUT LEVEL vernier to reset panel meter to +3
dB.
Signal Generator Spectrum Analyzer
OUTPUT LEVEL RF Level Set Log Reference
Switch (from (with Panel Level Control Display Amplitude
full cw) Meter) (dBm) (dB)
10 steps ccw -77 dBm -20 Set level
11 steps ccw -87 dBm -30 -2.5 - +2.5
12 steps ccw -97 dBm -40 -2.5 - +2.5
13 steps ccw -107 dBm -50 -2.5 - +2.5
14 steps ccw -117 dBm -60 -2.5 - +2.5
11. Set analyzer's display to 10 dB/division log. Adjust log reference level vernier to set signal to -10 dB graticule
line (one major division from top of display) plus last recorded entry on previous table.
NOTE
If the following step appears to be out of specification, check the accuracy of the analyzer's
display with an external, calibrated attenuator.
12. Set generator's OUTPUT LEVEL switch one step ccw to -127 dBm (adjust vernier for +3 dB indication on panel
meter). The amplitude level indicated on analyzer's display should be within 3 dB of the -20 dB graticule line
(second major division from top of display).
--22.5 -17.5 dB
NOTE
The noise level on the analyzer's display should be >10 dB below the signal level. The signal
should drop into the noise when the OUTPUT LEVEL vernier is turned fully ccw.
4-28
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