8 General Programming
272 M8190A User’s Guide
8.22 :TRACe Subsystem
Use the :TRACe subsystem to control the arbitrary waveforms and their respective
parameters:
Select the DAC width in direct mode and the interpolation factor in
interpolated mode.
Create waveform segments of arbitrary size with optional initialization.
Download waveform data into the segments.
Delete one or all waveform segments from the waveform memory.
8.22.1 Direct and Interpolated Mode
In direct mode (speed and precision mode) arbitrary waveforms are generated
directly from the DAC values in the waveform data. Each DAC value has a resolution
of 12 bits in speed mode and 14 bits in precision mode.
In interpolated mode the waveform data consists of I/Q sample pairs. They are first
interpolated and then sent to the internal IQ modulator. The result is sent to the
DAC. I and Q values have a size of 15 bits each.
8.22.2 Waveform Memory Capacity
DAC values and I/Q samples are stored in a dedicated waveform memory. The
capacity of this memory in samples depends on the waveform output mode and the
installed memory option.
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