5: Pulse measure and pulse generator units Model 4200A-SCS Parameter Analyzer
5-70 4200A-901-01 Rev. C / February 2017
Measurement types
There are two types of pulse measurements: Spot mean and waveform. The pulse_meas_sm
function is used to configure Spot mean measurements (on page 5-70) and the pulse_meas_wfm
(on
page 13-111) function is used to configure Waveform measurements (on page 5-72).
The Model 4225-PMU makes the following types of pulse measurements:
• Spot mean discrete
• Spot mean average
• Waveform discrete
• Waveform average
Use the following pulse generator functions to configure pulse measurements:
• Use the pulse_meas_sm function to configure spot mean measurements; select the data
acquisition type, set the readings to be returned, enable or disable time stamp, and set LLEC.
See Spot mean measurements (on page 5-70
) for details.
• Use the pulse_meas_wfm function to configure waveform measurements; select the data
acquisition type, set the readings to be returned, enable or disable time stamp, and set LLEC.
See Waveform measurements (on page 5-72
) for details.
• Use the pulse_meas_timing function to set measurement timing. For spot mean measurements,
portions of the amplitude and base levels are specified for sampling. For pre-data and post-data
waveform measurements, a percentage of the entire pulse duration is specified. See
Measurement timing (on page 5-74
) for details on pulse measurement timing.
Spot mean measurements
Spot mean measurements sample a portion of the amplitude and a portion of the base level (see
Spot mean measurement timing (on page 5-74
)). The portions to be sampled are specified as a
percentage. Note that you can return an individual spot mean for each pulse (see Spot mean discrete
readings (on page 5-70)), or have a single spot mean for all NumPulses (see Spot mean average
readings (on page 5-71)).
If you enable both amplitude and base spot means, each pulse has two voltage measurements and
two current measurements (see pulse_fetch (on page 13-101
)).
Spot mean discrete readings
The averaged voltage and current readings for every sampled pulse period are returned in a single
data set. The figure below shows how spot mean discrete readings are returned as a data set for two
pulse periods. With all voltage and current readings enabled, four readings are returned for each
pulse. The measured samples are averaged to yield the mean average readings. When time stamps
are enabled, a time stamp is included in the data set after each mean reading.
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