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4
Chapter 4 Remote Interface Reference
Pulse Width Modulation (PWM) Commands
Pulse Width Modulation (PWM) Commands
See also "Pulse Width Modulation" on page 93 in chapter 3.
PWM Overview
The following is an overview of the steps required to generate a
PWM waveform. The PWM commands are listed on the next page.
1 Configure the carrier (pulse) waveform.
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and
VOLT:OFFS commands to select the function, frequency, amplitude, and
offset of the pulse waveform. PWM is supported only for pulse.
2 Select the modulation source.
The function generator will accept an internal or external modulation
source. Select the modulation source using the PWM:SOUR command.
For an external source, you can skip steps 3 and 4 below.
3 Select the shape of the modulating waveform.
You can modulate the carrier with a sine, square, ramp, noise, or
arbitrary waveform (pulse and dc are not allowed). Use the
PWM:INT:FUNC command to select the modulating waveshape.
4 Set the modulating frequency.
Set the modulating frequency to any value from 2 mHz to 20 kHz using
the PWM:INT:FREQ command.
5 Set the pulse width or pulse duty cycle deviation.
Set the Width Deviation to a value from 0 to the current Pulse Width
or Period - Pulse Width, whichever is smaller, using the PWM:DEV
command. Or, set the Duty Cycle Deviation to a value from 0 to the
current Duty Cycle or 100 - Duty Cycle, whichever is smaller, using
the PWM:DEV:DCYC command.
6 Enable PWM modulation.
After you have set up the other modulation parameters, use the
PWM:STAT ON command to enable PWM.
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