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Chapter 3 Features and Functions
Pulse Width Modulation (PWM)
3
Pulse Width Modulation (PWM)
In Pulse Width Modulation (PWM), the width of a pulse waveform is
varied by the instantaneous voltage of the modulating waveform. The
width of the pulse can be expressed either as a pulse width (expressed in
time units, like the period) or a duty cycle (expressed as a percentage of
the period). The waveform generator will accept an internal or external
modulation source.
For more information on the fundamentals of Pulse Width Modulation,
refer to chapter 5, “Tutorial.”
To Select PWM Modulation
• The waveform generator only allows PWM to be selected for a pulse
waveform.
• The waveform generator will not allow PWM to be enabled when
sweep or burst is enabled.
• Front-Panel Operation: You must enable PWM before setting up any
of the other modulation parameters. Press
,
select Pulse, and
then press
and
Modulate
to turn on modulation. PWM is
selected as the only modulation type supported for pulse. The PWM
waveform is output using the present settings for the pulse
frequency, modulating frequency, output amplitude, offset voltage,
pulse width, and edge time.
• Remote Interface Operation: To avoid multiple waveform changes,
enable PWM after you have set up the other modulation parameters.
PWM:STATe {OFF|ON}
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