Download Model 1281A

Remote Programming Reference
Modulated Waveforms Control Commands
5
The 1281A will return the present modulating waveform frequency value. The returned value will be in
standard scientific format (for example: 100mHz would be returned as 100e-3 – positive numbers are
unsigned).
FM:FREQuency:RASTer<arb_fm_freq>(?)
Description
This command will set the sample clock frequency for the arbitrary modulating waveform. Arbitrary
modulating waveforms must be created in an external utility and downloaded to the FM arbitrary waveform
memory before this function can be used.
Parameters
Name
Range
Type
Default
Description
<arb_fm_freq
>
1 to
2.5e6
Numeric
1e6
Programs the sample clock frequency of the arbitrary
modulating waveform in units of S/s.
Response
The 1281A will return the present sample clock of the arbitrary modulating waveform value. The returned
value will be in standard scientific format (for example: 100mHz would be returned as 100e-3 – positive
numbers are unsigned).
FM:DEViation<deviation>(?)
Description
This programs the deviation range around the carrier frequency. The deviation range is always symmetrical
about the carrier frequency. If you need non-symmetrical deviation range, you can use the arbitrary FM
composer screen or an external utility to design such waveforms.
Parameters
Name
Range
Type
Default
Description
<deviation>
100e-3 to
398e6
Numeric
1e6
Programs the deviation range around the carrier
frequency in units of Hz.
Response
The 1281A will return the present deviation frequency value. The returned value will be in standard
scientific format (for example: 100mHz would be returned as 100e-3 – positive numbers are unsigned).
FM:MARKer<frequency>(?)
Description
This function programs marker frequency position. FM marker can be placed inside the following range:
(carrier frequency ± deviation frequency / 2). The marker pulse is output from the SYNC output connector.
Parameters
5-47