
400
Agilent X-Series Signal Generators SCPI Command Reference
Real–Time Commands
Custom Subsystem–Option 431([:SOURce]:RADio:CUSTom)
is playing, the waveform will retrigger at the end of the current waveform
sequence and play once more.
OFF (0)
This choice (No Retrigger) specifies that if a trigger occurs while a waveform is
playing, the trigger will be ignored.
IMMediate
This choice (Restart on Trigger) specifies that if a trigger occurs while a waveform
is playing, the waveform will reset and replay from the start immediately upon
receiving a trigger.
*RST
ON
Remarks
This command applies to the single trigger type only.
:SRATe
Supported
N5172B/82B with Option 431
[:SOURce]:RADio:CUSTom:SRATe <val>
[:SOURce]:RADio:CUSTom:SRATe?
This command sets the transmission symbol rate. Symbol rate is the bit rate divided by the bits per
symbol. A change in the symbol rate affects the bit rate. Refer to
“:BRATe” on page 380
for
information on bit rate.
The variable
<val>
is expressed in units of symbols per second (sps–Msps) and the maximum symbol
rate depends on the filter. Refer to
“:FILTer” on page 388
for minimum filter symbol widths.
The filter may have to be truncated down to 32 or 16 symbols wide to achieve the highest symbol
rate. The signal generator’s internal filters are not truncated below their minimum filter length and
user- defined FIR filters are not truncated. If the filter cannot be truncated then the symbol rate is
limited to the maximum rate of the narrowest filter size possible.
The relative timing of the modulated data, as well as the actual filter response is affected when the
filter is truncated.
When the symbol rate changes, the signal generator reconfigures the baseband generator. The time
required to reconfigure the baseband generator is inversely proportional to the symbol rate: lower
symbol rates require more time.
To change the modulation type, refer to
“:MODulation[:TYPE]” on page 392
.
*RST
+1.0006
The following table shows the symbol range for internal Custom data operation.
Key Entry
No Retrigger
Buffered Trigger
Restart on Trigger
Range
Min
Symbol
Rate
N5172B Opt
653
Max Symbol
Rate
N5172B Opt
655
Max Symbol
Rate
N5182B Opt
656
Max Symbol
Rate
N5182B Opt
657
Max Symbol
Rate
1 sps
37.5 Msps
57 Msps
50 Msps
100 Msps