# 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](https://1704635928-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FH5etzy4TvPRLxLRNfHlb%2Fuploads%2Fgit-blob-e515740e478548839e3aab535aa02c884c0d94c6%2FSystem_Overview.png?alt=media)

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