Bnc 645 User Manual download pdf (Page 142)

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--The modulating waveform is a square wave with a 50% duty cycle.

FSKey: INTernal:RATE? [MINimum|MAXimum]

Query the FSK rate. The FSK rate will be returned.

FSKey: SOURce {INTernal|EXTernal}

Specify the FSK source. The default is Internal.

FSKey: SOURce?

Query the FSK source. “INT” or “EXT” string indicating FSK source will be

returned.

FSKey: STATe {OFF|ON}

Disable or enable FSK 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 FSK

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

FSKey: STATe?

Query the FSK state. “0” (OFF) or ”1” (ON) will be returned.

FUNCtion:PULSe:HOLD {WIDTh|DCYCle}

Instruct the waveform generator to hold either the pulse width or the duty cycle.

z When the pulse width is held constant, the period is varied. (Minimum

width and edge time restrictions apply.) If a command specifying the duty

cycle is received, the duty cycle is converted into equivalent pulse width in

seconds. If Pulse Width Modulation is turned on, the pulse width is held,

and the width deviation is held too, as the period is varied. Duty cycle

deviation commands are converted to width deviation values.

z When the duty cycle is held constant, the period is varied. (Minimum width

and edge time restrictions apply.) If a command specifying the pulse width

is received, the pulse width is converted into equivalent duty cycle in

percent. If Pulse Width Modulation is turned on, the duty cycle is held, and

the duty cycle deviation is held too, as the period is varied. Pulse width

deviation commands are converted to duty cycle deviation values.

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Bnc 645 User Manual Page 142