BNC 645 - Manual (Page 159)

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produce less deviation, and negative signal levels produce negative deviation.
Note: The operation of this command is affected by FUNC:PULS:HOLD
command. FUNC:PULS:HOLD command decides if the pulse width or the duty
cycles are to be held constant as the period varies. If the pulse width is held
constant, so is the pulse width deviation; If the duty cycle is held constant, so is
the duty cycle deviation. If one is held constant, the other specified in the
command will be automatically converted to the equivalent value.
PWM:DEViation:DCYCles? [MINimum|MAXimum]
Query the duty cycle deviation in PWM. The duty cycle deviation in percent will
be returned.
PWM:SOURce {INTernal|EXTernal}
Specify the modulating signal source. The waveform generator takes either an
internal or an external source. The default is internal. When choosing an
external source, the pulse waveform is modulated with an external waveform.
The width/duty cycle deviation is controlled by the ±5V signal level shown on
the Modulation In connector on the rear panel. It means that when the
modulating signal is at +5V, the output will be at its maximum duty cycle, and
when the modulating signal is at -5V, the output will be at its minimum duty
cycle.
PWM:SOURce?
Query the modulating source in PWM. “INT” or “EXT” string indicating
modulating source will be returned.
PWM:STATe {OFF|ON}
Disable or enable PWM. The default is Off. To avoid multiple waveform changes,
you can enable it after setting up the modulation parameters.
Only one type of modulation can be activated at one time. Also when PWM is
activated, sweep or burst mode will be disabled. PWM is allowed only when pulse
is used.
PWM:STATe?
Query the PWM state. “0” (OFF) or ”1” (ON) will be returned.