82 Chapter 2
Performance Verification Tests
10. Residual FM
reference level. If it is not, press Sweep, Sweep (Cont), FREQUENCY,
and use the knob to place the displayed trace about five divisions
below the reference level. Press Single.
6. On the analyzer, press Peak Search (or Search),
Pk-Pk Search. Read the marker delta (∆ Mkr1) amplitude, take its
absolute value, and record the result as the Deviation.
Deviation ____________ dB
7. Calculate the Residual FM by multiplying the deviation recorded in
step 6 by 0.426 Hz/dB. This is the slope of the 10 Hz Res BW filter at
10 dB below the peak of the filter.
Record this value as Test Record entry 2 (Residual FM (10 Hz RBW))
in the performance verification test record.