Select the source of the modulating signal. The instrument will accept an
INTernal or EXTernal modulation source. The default is INT[1]. The
:PWM[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 pulse width
or pulse duty cycle 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 pulse width deviation to 50 µs using the PWM:DEV command, then
a +2.5V/+5V signal level corresponds to a 50 µs width increase. Lower
external signal levels produce less deviation.
If you select the other channel as the modulation waveshape (“INT2”) the
SCPI command :PWM[1|2]:INT:FREQ doesn’t apply.
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