IFR FM/AM-1200A Operation Manual page 78

STEP PROCEDURE
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2. Modulate transmitter under test with a fixed 1 kHz tone.
[Non!
FM/AM-1200S/A 1 kHz Tone Generator (fixed)
function should be used as a modulation
source.
Measurement accuracy is dependent on accuracy of
1 kHz tone.
3. Position Modulation METER Control (4) to ''DIST".
4. Connect coax cable between FM/AM-1200S/A DEMOD Connector (16)
and EXT MOD/SINAD Connector (15).
5. Monitor DIST Level on top scale of MODULATION Meter (1).
6. Place VERTICAL Attenuator Selector Control (24) to "RESID''
position to observe residual distortion on oscilloscope.
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