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Chapter 4 Remote Interface Reference
Pulse Width Modulation (PWM) Commands
4
PWM Commands
PWM:SOURce {INTernal|EXTernal}
PWM: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 pulse width or pulse duty cycle
deviation is controlled by the ±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 +5V
signal level corresponds to a 50 µs width increase. Lower external
signal levels produce less deviation.
PWM:
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 (
PWM:SOUR INT
command). (The
carrier must be a pulse waveform for PWM.)
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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