Bnc 645 User Manual download pdf (Page 47)

7. Press the Graph button to view all the waveform parameters.

Remote interface operation

Use these commands to output a frequency modulation waveform:

FUNCtion {SINusoid|SQUare|RAMp|USER}

FREQuency {<frequency>

︱MINimum|MAXimum}

VOLTage {<amplitude>

︱MINimum|MAXimum}

VOLTage:OFFSet {<offset>

︱MINimum|MAXimum}

FM:INTernal:FUNCtion

{SINusoid|SQUare|RAMp|NRAMp|TRIangle|NOISe|USER}

FM:INTernal:FREQuency {<frequency>MINimum|MAXimum}

FM:DEViation {<peak deviation in Hz>

︱MINimum|MAXimum }

FM:SOURce {INTernal|EXTernal}

FM:STATe ON

Notes

• Only one type of modulation can be activated at one time. When

frequency modulation is enabled, the previously selected

modulation is automatically disabled.

•

Frequency modulation cannot be enabled with sweep or burst

mode at the same time. When frequency modulation is enabled,

sweep or burst mode will be disabled.

4.9 Phase Modulation

Phase modulation provides a waveform in which the phase of the carrier

waveform varies with the modulating waveform.

Carrier Waveform

The default carrier waveform is sine. One may also choose from square,

ramp and arbitrary waveforms but not pulse, noise and dc waveforms.

The default carrier frequency is 1 kHz for all waveforms. Each carrier

waveform has its own acceptable range of frequencies. Refer to the table

in Section 3.4 “To Set Output Frequency/Period” for details.

Modulating Waveform

Model 645 accepts either internal or external modulating source but not

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Bnc 645 User Manual Page 47