> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/ltt/documentation/ltt-gui-manual/gettingstarted/system-overview.md).

# System Overview

A **life time tester** (LTT) is an electric control cabinet, whose purpose is to perform **long term electrical tests** on various electrical devices (so called *devices under test*, or short DUT) under certain **environmental conditions** (temperature, humidity, etc.). One can say, it simulates the aging process or lifetime of an electrical device.

The **IRS LTT software**, which comes with every **IRS life time tester** is composed of several parts.

![System Overview](/files/tOde7L55NuNqPca7qN2H)

This is the documentation of the IRS LTT software, including the graphical user interface (GUI), the TestStand sub system and all other related components.


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