Select the source of the modulating signal. The instrument will accept an
INTernal or EXTernal modulation source. The default is INT[1]. The
:PM[1|2]:SOUR? query returns “INT” or “INT2” or “EXT”.
INT[1] selects an internal modulation signal and INT2 selects the other
channel of the instrument (if available). If you select the External source, the
carrier waveform is modulated with an external waveform. The phase
deviation is controlled by the ±2.5V/±5V signal level present on the rear-
panel Modulation In connector. For example, if you have set the phase
deviation to 180 degrees using the PM:DEV command, then a +2.5V/+5V
signal level corresponds to a 180 degree phase deviation. Lower external
signal levels produce less deviation, and negative signal levels produce a
negative phase shift.
If you select the other channel as the modulation waveshape (“INT2”) the
SCPI command :PM[1|2]:INT:FREQ doesn’t apply.
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