BNC 645 - Manual (Page 47)

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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