-SCS Pulse Card (PGU and PMU) User's Manual Section 4:
4200A-PMU-900-01 Rev. B March 2023 4-31
A waveform measurement can include pre-data and post-data. Pre-data is extra data taken before
the rise time of the pulse; post-data is extra data taken after the fall time. Waveform measurements
(on page 4-27) shows an example where 10% (0.1) pre-data and 10% (0.1) post-data is taken.
The number of samples taken on the pulse is dependent on the size of the pulse to be sampled and
the sampling rate. Use the LPT command pulse_sample_rate function to set the sampling rate for
pulse measurements.
In the function, a percentage must be expressed as its decimal equivalent. For example, specify 50%
as 0.5 in the function.
Example: pulse_meas_sm
This function sets channel 1 of the PMU for the spot mean discrete measure type to acquire the
voltage amplitude measurement, the current base level measurement, and the time stamps. It also
enables LLEC for amplitude:
pulse_meas_sm(PMU1, 1, 0, 1, 0, 1, 0, 1, 1);
Where:
• Instr_id = PMU1
• chan = 1 (channel 1)
• AcquireType = 0 (discrete)
• AcquireMeasVAmpl = 1 (enable)
• AcquireMeasVBase = 0 (disable)
• AcquireMeasIAmpl = 1 (enable)
• AcquireMeasIBase = 0 (disable)
• AcquireTimeStamp = 1 (enable)
• LLEComp = 1 (enable)
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