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SCPI Commands for the Digital to Analog Converter
VX4101A MultiPaq Instrument User Manual
3–183
and execute the TRACe command. The instrument must be re-initiated to
start generating a waveform again.
TRACe|DATA[:DATA] <Channel>,<Numeric List of Indices>{,<ASCII Trace Voltages>
This command enables you to use the arbitrary waveform generator capabilities
of the DAC. All commands use either the TRACe or DATA prefix. The
commands load the selected DAC channel with the list of sample voltage values.
The command programs the DAC to use ASCII data.
You can use the parameters provided with the command, as follows:
If either the Channel Select or the Array Index integer parameters are
omitted, an error is generated.
If this command is sent while the instrument is generating a waveform (e.g.
Sweeping), then the instrument will automatically perform and implied abort
and implement the trace command. The instrument must be re-initiated to
start generating a waveform again.
TRACe:POINts <Trace Buffer Points>
This command defines the number of sample points that comprise a segment.
Each segment can have a maximum of 1024 data points (2048 byes). The points
register is shared between each of the 8 DAC channels. Consequently, the Points
command specifies the number of data points for each of the DAC waveforms.
There is only one data point count register for all DAC channels. If the <Trace
Buffer Points> field is omitted or is out of limits, the instrument generates an
error.
NOTE. The number of points multiplied by the sample period (or 1/sample rate)
must be less than 16 seconds. If the number of points more than 16 seconds, the
instrument returns an error upon an INITiate command.
TRACe:RFRequency <repeat frequency|OFF>
This command defines the repetition frequency of each waveform segment. It is
the inverse of the TRACe:RPERiod. It defines the inverse of the waveform
repeat period. For more information, see the TRACe:RPERiod command
description.
Default units are in Hz. If the repeat period is set to OFF, the instrument will not
allow any gaps, i.e. the repeat period will be calculated to equal the waveform
period. Programming a repetition frequency is illegal if the trigger mode is
SAMPle. An error will be generated on INITiate if the repetition frequency is
enabled while the trigger mode is SAMPle.