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QEI 691 Instruction Manual page 25

Fm modulation monitor/test set
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Connect your Distortion Analyzer
DE EMP output (AIJ2).
g.
Adjust A4C38 and A4C40 for minimum distortion.
h.
Recheck steps c and d
if
necessary.
i.
Depress
button AlS7. Adjust A4L17 until
calibrate oscillator appears centered on the
Analyzer display.
j.
Adjust A4R35 and A4L16 until the carrier is in
i
deepest
null. This will be a modulation percentage of 102.
NOTE:
Due to some distortion when fil
ng a square
wave, some positive
negative assymetry will
be noted.

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