Figure 76: Vd-Id family of curves with LLEC disabled
For user test modules (UTMs), although the process described above applies, there are a few
differences. Although ITMs and UTMs can perform similar tests, UTMs are based on user modules.
UTMs have a much wider range of test behaviors and possibilities than ITMs. This document provides
a framework for troubleshooting UTMs (individual UTM issues are not covered).
In addition to the above procedure based on unexpected results, UTM troubleshooting also involves
error messages or codes. Typically, the user modules are written for a specific test or requirement
and have minimal error checking. This means that parameter values or combinations of parameter
settings may cause an error, which is the primary feedback about the test status.
This error may be generated from within the user module, or by an LPT command. The following
figure shows the user module description for PMU_IV_sweep_Example. This description is part of
the user module and may contain a description of the test, hardware requirements, individual
parameter descriptions, and error code listings. The error code listings are after the parameter
descriptions, which are typically at the bottom of the description content (you will need to scroll down
the Help pane).
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