Racal Instruments 3155 User Manual page 140

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
Programming Reference 4-30
User Manual 3155