Bnc 645 User Manual download pdf (Page 155)

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PM:DEViation? [MINimum|MAXimum]

Query the phase deviation in phase modulation. The phase deviation in degree

will be returned.

PM:SOURce {INTernal|EXTernal}

Specify the modulating signal source. The default is INTernal. When an external

source is selected, the carrier is modulated with an external waveform. The

phase deviation is controlled by the ±5v signal on the rear panel Modulation In

connector. It means that when you choose to have a deviation of 180 degrees,

then a +5V signal level corresponds to a 180 degree phase shift. Lower the

external signal level is, less the deviation is.

PM:SOURce?

Query the modulating source in phase modulation. “INT” or “EXT” string

indicating the modulating source will be returned.

PM:STATe {OFF|ON}

Disable or enable Phase Modulation. 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 Phase

modulation is activated, sweep or burst mode will be disabled.

PM:STATe?

“0” (OFF) or ”1” (ON) will be returned.

PWM:INTernal:FUNCtion

{SINusoid|SQUare|RAMP|NRAMP|TRIangle|NOISe|USER}

Specify the shape of the modulating waveform. The default is sine. This applies

when the modulation source is internal (PWM:SOUR INT). The carrier is a pulse

wave in PWM.

-- Square waveform has 50% duty cycle.

--Ramp waveform has 100% symmetry

--Triangle waveform has 50% symmetry.

--Negative Ramp waveform has 0% symmetry.

--If an Arbitrary(USER) waveform is chosen to be the modulating waveform, it is

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Bnc 645 User Manual Page 155