4: Pulse card concepts Model 4200A-SCS Pulse Card (PGU and PMU)
4-30 4200A-PMU-900-01 Rev. B March 2023
Measurement timing
Use the pulse_meas_timing function to configure pulse measurement timing.
Spot mean measurement timing
The spot mean measurement type samples a portion of the amplitude and a portion of the base level.
The measured samples are then averaged to yield a single voltage and current reading for the
amplitude and base low levels. The NumPulses (number of pulses) parameter specifies the number
of pulses to be output and sampled.
The figure below shows that three measured samples are taken on the amplitude and six samples are
taken on the base level. The start and stop percentage values indicate the portions of the pulse that
are sampled. As shown, the beginning of the amplitude and base level are designated as the zero (0)
percent points; the ends are designated as the 100% points. The start and stop points for amplitude
and base-level sampling are expressed as a percentage between 0% and 100%. The default is 75%
for the start of spot mean and 90% for end of spot mean. These percentages are applied to the total
time of the pulse top. In this example, sampling for the amplitude and base levels starts at 60% (0.6)
and ends at 80% (0.8).
The number of samples taken on the amplitude and base level is dependent on the size of the
portions to be sampled and the sampling rate. Use the pulse_sample_rate function to set the
sampling rate for pulse measurements.
Figure 98: Spot mean measurements example
Waveform measurement timing
The waveform measurement type samples the pulse as shown in Waveform measurements (on page
4-27). Sampling is performed on the entire duration (100%) of the pulse. This includes the rise time,
amplitude, and fall time portions of the pulse. A voltage and/or current reading is returned for
every sample.
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