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Chapter 4 Remote Interface Reference
Amplitude Modulation (AM) Commands
4
AM Commands
AM:SOURce {INTernal|EXTernal}
AM:SOURce?
Select the source of the modulating signal. The function generator will
accept an internal or external modulation source. The default is INT.
The :SOUR? query returns “INT” or “EXT”.
•If you select the External source, the carrier waveform is modulated
with an external waveform. The modulation depth is controlled by the
±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:DEPT
command, then when the modulating signal is at +5 volts,
the output will be at the
maximum
amplitude. When the modulating
signal is at -5 volts, then the output will be at the
minimum
amplitude.
AM:
INTernal
:FUNCtion {SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|USER}
:FUNCtion?
Select the shape of the modulating waveform. Used only when the
Internal
modulation source is selected (
AM:SOUR INT
command). You can
use noise as the modulating waveshape, but you cannot use noise, pulse,
or dc as the carrier waveform. The default is SIN. The :FUNC? query
returns “SIN”, “SQU”, “RAMP”, “NRAM”, “TRI”, “NOIS”, or “USER”.
• Select “SQU” for a square waveform with a 50% duty cycle.
• Select “RAMP” for a ramp waveform with 100% symmetry.
• Select “TRI” for a ramp waveform with 50% symmetry.
• Select “NRAM” (negative ramp) for a ramp waveform
with 0% symmetry.
• If you select an arbitrary waveform as the modulating waveshape
(“USER”), the waveform is automatically limited to 4K points.
Extra waveform points are removed using decimation.
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and
VOLT:OFFS commands to configure the carrier waveform.
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