Features and Function
HDG2000 Series Arbitrary Waveform Generator
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3.6 Pulse Width Modulation (PWM)
This section discusses PWM, which stands for pulse-width modulation. PWM is only available for
the Pulse waveform, and the pulse width varies according to the modulating signal. The amount by
which the pulse width varies is called the width deviation, and it can be specified as a percentage
of the waveform period (that is, duty cycle) or in units of time.
For example, if you specify a pulse with 20% duty cycle and then enable PWM with a 5% deviation,
the duty cycle varies from 15% to 25% under control of the modulating signal.
The instrument accepts an internal, external or external trig modulation source.
To Select PWM
You cannot enable PWM when sweep or burst is enabled.
To avoid multiple waveform changes, enable modulation after configuring the other modulation
parameters.
SCPI:
SOURce<n>:MOD ON|OFF
SOURce<n>:MOD:TYPe PWM
Modulating Waveform Shape
The instrument accepts an internal, external or external trig modulation source.
The modulating waveform shape (internal source) may be:
Sine wave
Square with 50% duty cycle
UpRamp with 100% symmetry
Triangle with 50% symmetry
DnRamp with 0% symmetry
Noise - white gaussian noise
Arbitrary waveform
You can use noise as the modulating waveshape, but you cannot use noise, arbitrary
waveforms, or DC as the carrier.
Front-Panel: