-SCS Parameter Analyzer Reference Manual Section 13:
LPT library function reference
4200A-901-01 Rev. C / February 2017 13-91
LPT commands for PGUs and PMUs
The 4200A-SCS has built-in project tests that use the PGU and PMU LPT commands. Refer to the
pmu-dut-examples project for a simple example of coding a PMU user test module (UTM).
The following information explains the commands in the LPT library for the 4220-PGU and 4225-
PMU. The model names are abbreviated as PGU (pulse-generator unit) and PMU (pulse-measure
unit). The PGU functions only as a pulse generator, but the PMU has both pulse and measurement
capabilities. See PGU (pulse only) and PMU (pulse and measure) group (on page 13-5
) for a
summary of the functions for the PGU and PMU.
The pulse commands for the 4220-PGU and 4225-PMU require pulse_exec to execute. In addition,
they support external triggering, but do not support trigger input from external input signals or
instruments.
The PGU and PMU support the following pulse modes:
• Standard pulse mode: For this two-level pulse mode, the user defines an amplitude and base
level for the pulse output.
• Segment Arb pulse mode: For this multi-level pulse mode, you define a pulse waveform that
consists of three or more line segments. Segment Arb pulse mode for the PGU and PMU also
includes sequencing and sequence looping (see seg_arb_sequence (on page 13-125
) and
seg_arb_waveform (on page 13-128) for the PGU and PMU).
• Full arb pulse mode: For this multilevel pulse mode, the waveform consists of a number of user-
defined points (see arb_array (on page 13-131) and arb_file (on page 13-132
)).
Use the following instrument ID (identification) for LPT commands for the PGU and PMU:
• 4220-PGU: The instrument ID is VPU (VPU1, VPU2, and so on)
• 4225-PMU: The instrument ID is PMU (PMU1, PMU2, and so on)
The 4220-PGU and 4225-PMU support the pulsing and external triggering commands of the
obsolete 4205-PG2.
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