TestStand

National Instrument TestStand is the underlying test execution system used by the LTT GUI.

This chapter is by no means an introduction or documentation of National Instruments TestStand itself. At this point you should already have basic knowledge about basic TestStand concepts such as sequence files, sequences, steps and variables. If not, maybe you want to read the TestStand help document.

Within the LTT folder structure all TestStand related files are located below [Install Location]\50_LTT_SW\LTT TS\. The TestStand sequence file which represents your LTT testplan must be located there. There is a LTT sequence file template (\50_LTT_SW\LTT TS\LTT Template.seq) if you want or need to begin from scratch. This sequence file template contains all necessary structures needed for a LTT testplan.

The LTT template sequence file is different for MesSy II or MesSy II FD. Depending on what you have selected during installation, the template file is for that MesSy version. If you want to switch to the other MeSy version read chapter MesSy Version Setup.

A TestStand sequence file must meet certain criteria in order to be used for LTT. We call TestStand sequence file a LTT testplan, when it fulfills all required criteria.

The required criteria for a TestStand sequence file to be a LTT testplan are as follows:

• it need to have a specific process model

• it need to contain some predefined sequences

• it need to contain some predefined variables

During this chapter the terms execution, socket, DUT and (test)station may be used. They are interchangeable in most cases. Execution or socket are NI TestStand jargon. An execution / socket means a single DUT / test station.