> 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/lttgui/dialogs/f3projectwizard/testgroupsconfiguration.md).

# Test Groups Configuration

A *test group* is a logical container which groups one or more DUT's together with one or more power supplies and temperature sensors. You need to define at least one test group.

![Groups](/files/VaHUng3LpUBFJ4ysW59m)

To **add a test group** simply click on an empty row in the grid and type a name. To **delete a test group** select a row and press the DEL key on your keyboard.

The **Max. Runtime** parameter is the desired runtime in hours of the tests running under this group. You can later change this parameter in the [F10 - test parameter configuration](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration.md) dialog.

The **TCC mask** determines, which of the total of 8 [TCC inputs](/ltt/documentation/ltt-gui-manual/lttgui/hwcontrol/tcc-control-gui.md) you want to use for this group. You can use all 8 inputs or just a subset of them. You can also use the same inputs in multiple groups. The TCC mask determines, which TCC indicators are displayed for each group in main window's [group display](/ltt/documentation/ltt-gui-manual/lttgui/mainwindow/groupdisplay.md) or in the [F10 - test parameter configuration](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration.md) dialog.

{% hint style="info" %}
If you move your mouse cursor over such an TCC input indicator, a tooltip appears, showing the TCC indicator index. The index goes from 1 to 8 (left to right).
{% endhint %}

Finally you assign one or more of the **available power supplies (PS) and temperature sensors (TS)** to each group. Those are defined in the [module configuration file](/ltt/documentation/ltt-gui-manual/configuration/moduleconfiguration.md), which you need [setup](/ltt/documentation/ltt-gui-manual/gettingstarted/initial-setup-guide.md) before running the project wizard. Multiple power supplies and temperature sensors are differentiated by a 1-based index following its fixed prefix (PS or TS). In TestStand you can [refer to those power supplies and temperature sensors](/ltt/documentation/ltt-gui-manual/teststand/predefinedvariables.md#PS_TS_INDEX) by using that index.

***

[go to initial setup guide](/ltt/documentation/ltt-gui-manual/gettingstarted/initial-setup-guide.md#SETUP_GUIDE)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.irs.systems/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f3projectwizard/testgroupsconfiguration.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.