# Dynamic Test

Dynamic Test is a diagnostic tool in the Tunnel Setup app. The test allows you to validate the proper functioning of your vision tunnel. During the initial commissioning of the vision tunnel, Cognex engineers use this test to validate that the vision tunnel functions properly. The engineers ensure that the test is run correctly, and they address all issues. It is a standard procedure for new installations.

While the test is typically part of the installation process, you can rerun the test any time to validate that the vision tunnel still functions correctly. If you run into an error during the test, refreshing the page can likely solve the error. If the error persists, contact Cognex technical support for further assistance.

Note: The Dynamic Test can have variations to fit various vision tunnel designs. This document describes one common type of Dynamic Test but you might have a different variation. Despite this, most of the guidance here is still relevant.

- In some variations, the test includes only a center position, without the left- and right-justified tests.

- Certain variations allow you to skip the encoder check or do not include it at all. This is more common when using a non-belted conveyor, such as a tilt tray, crossbelt, or bomb-bay system.