Racal Instruments 3155 Spezifikationen Seite 141

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User Manual 3155
Programming Reference 4-30
FM?
Response and default
The 3155 returns 1 if the FM is on, or 0 if the FM is off. Default is 0.
FM:DEViation<deviation>
Purpose
This command sets the deviation frequency in units of samples per second.
<deviation> sets the phase offset between the channels. Phase offset is in waveform points
Parameter type
Numeric
Parameter range
<deviation> 100e-3 to 100e6 in units of samples per second
FM:DEViation?
Response and default
The 3155 returns the present frequency deviation value. The returned value is in standard scientific format
(for example: 100mHz would be returned as 100E-3 – positive numbers are unsigned). Default value is 1e3.
Default value is 1e6.
FM:FUNCtion:MODE{FIXed|USER}
Purpose
This command sets the frequency modulating waveform mode to FIXed (standard) and USER (arbitrary)
waveforms.
FIXed enables the library of built in standard waveforms
USER sets the generator to accept arbitrary waveforms downloaded externally
Parameter type
Discrete
FM:FUNCtion:MODE?
Response and default
The 3155 returns FIX, or USER depending on its present setting. Default is FIX.
FM:FUNCtion:SHAPe{SINusoid|TRIangle|SQUare|RAMP}
Purpose
This command selects one of the waveform shapes as the active modulating waveform.
SINusoid selects sine shape as modulating waveform
TRIangle selects triangular shape as modulating waveform
SQUare selects square shape as modulating waveform
RAMP selects ramp shape as modulating waveform
Parameter type
Discrete
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