Pulse Width Modulation (PWM)
Width or Duty Cycle Deviation
The PWM deviation setting is the peak variation in width of the modulated pulse waveform. You can set it in units of
time or duty cycle.
l Front-Panel:
To set deviation in terms of duty cycle:
l SCPI: PWM:DEViation {<width or duty_cycle>|MIN|MAX}
l The sum of the pulse width and deviation must satisfy the formula:
Pulse Width + Deviation < Period – 16 ns
l If necessary, the instrument will adjust the deviation to accommodate the specified period.
Modulating Source
The instrument accepts an internal or external modulation source.
l Modulating source: Internal (default), Other Channel, or External.
l If you select the External modulating source, the deviation is controlled by the ±5 V signal level on the rear-panel
Modulation In connector. For example, if you have set the deviation to 1 µs, then a +5 V signal corresponds to a
1 µs increase in width. Lower signal levels produce less deviation.
Agilent 33500 Series Operating and Service Guide 85
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