Keithley 4200A-SCS, Reference Manual

Page: 197 / 1381

Section 5: Pulse measure and pulse generator units Model 4200A-SCS Parameter Analyzer Reference Manual
5-4 4200A-901-01 Rev. C / February 2017
Pulse measurement types (PMU)
The next table summarizes pulse measurement types that are available through LPT commands for
the 4225-PMU. See
Measurement types (on page 5-70) for detailed information.
Pulse measurement types
Measurement type Description
Spot mean discrete Samples a portion of the high and low levels. The samples are averaged to
yield a single current and voltage reading for the high level and low level
(see the Spot mean measurements example figure;
Measurement types (on
page 5-70)).
Spot mean average A specified number of pulse periods are output for the burst sequence. Spot
mean discrete measurements are performed for each pulse and then
averaged to yield a single voltage and current reading for the high and low
levels.
Waveform discrete The entire pulse is sampled. Sampling is performed on the rise time, top
width, and fall time portions of the pulse. A voltage and current reading is
yielded for every sample taken on the pulse (see
Measurement types (on
page 5-70) Waveform measurements and Waveform measurements (with
pre-data and post-data) figures).
Waveform average A specific number of pulses are output for the burst sequence. Waveform
discrete measurements are performed on each pulse. The corresponding
samples for each pulse are then averaged to yield a group of voltage and
current readings for the burst sequence.
Measure modes
The measure modes for the PMU are discrete pulses and average pulses.
.
Discrete pulses
For pulse I-V (spot mean), the averaged voltage or current readings for every sampled pulse period
are acquired.
For waveform capture, enabled voltage and current readings and timestamps for every sample of the
waveform are acquired.
For ITM operation, the readings are placed in the Analyze worksheet.
See Spot mean discrete readings (on page 5-70) for details on the discrete pulses measure mode for
pulse I-V. For UTM programming, the discrete pulse measure mode is called spot mean discrete.
The
pulse_meas_sm (on page 13-108) function is used to select the discrete acquisition type.
See Waveform discrete readings (on page 5-73) for details on the discrete pulses measure mode for
waveform capture. For UTM programming, the discrete pulse measure mode is called waveform
discrete. The
pulse_meas_wfm (on page 13-111) function is used to select the discrete acquisition
type.