5: Pulse measure and pulse generator units Model 4200A-SCS Parameter Analyzer
5-74 4200A-901-01 Rev. C / February 2017
Measurement timing
The pulse_meas_timing (on page 13-108) function is used 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 (on page 13-116
) function
to set the sampling rate for pulse measurements.
Figure 209: Spot mean measurements example
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