Select the source of the modulating signal. The instrument will accept an
internal or external modulation source. The default is INT[1]. The
:AM[1|2]:SOUR? query returns “INT” or “INT2” or “EXT”. INT
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 modulation depth is
controlled by the ±2.5V/±5V signal level present on the rear-panel
Modulation In connector. For example, if you have set the modulation depth
to 100% using the :AM[1|2]:DEPT command, then when the modulating
signal is at +2.5/+5 Volts, the output will be at the maximum amplitude.
When the modulating signal is at -2.5/-5 Volts, then the output will be at the
minimum amplitude.
If you select the other channel as the modulation waveshape (“INT2”) the
SCPI command :AM[1|2]:INT:FREQ doesn’t apply.
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