Model 8640B TM 9-4935-601-14-7&P
PERFORMANCE TESTS
4-23. OUTPUT LEVEL ACCURACY TEST (Abbreviated) (Cont'd)
6. Step Signal Generator's OUTPUT LEVEL switch and analyzer's vertical scale log reference level control as
shown in the following table. Verify that the amplitude falls within +2.0 dB (1 division) of the center (reference)
graticule line in each case. 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 Display Amplitude
Switch (from (with Panel Level Control (dB)
full cw) Meter) (dBm)
3 steps ccw -7 dBm -20 Set level
4 steps ccw -17 dBm -30 -2.0 - +2.0
5 steps ccw -27 dBm -40 -2.0 - +2.0
6 steps ccw -37 dBm -50 -2.0 - +2.0
7. Set analyzer's vertical scale log reference level to -10 dBm and reset the 10 dB step attenuator to 30 dB. With
the vertical scale log reference vernier, set the signal peak to the same level, with respect to the horizontal
center (reference) graticule line, as the last measurement recorded on the preceeding table.
NOTE
If generator appears to be out of specification, check accuracy of spectrum analyzer's vertical
scale calibration.
8. Step Signal Generator's OUTPUT LEVEL switch and analyzer's vertical scale log reference level control as
shown in the following table. Verify that the amplitude is within the specified tolerance. 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 Display Amplitude
Switch (from (with Panel Level Control (dB)
full cw) Meter) (dBm)
6 steps ccw -37 dBm -10 Set level
7 steps ccw -47 dBm -20 -2.5 - +2.5
8 steps ccw -57 dBm -30 -2.5 - +2.5
9 steps ccw -7 dBm -40 -2.5 - +2.5
10 steps ccw -77 dBm -50 -2.5 - +2.5
4-27
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