# Open End Tuning

The open end tuning function is available for tools configured with open end Gear Front Attachment (GFA).
The function calculates the true gear ratio of both the tool and the extension combined, and saves it to the tool.
The tuning takes approximately 2 minutes to perform.

When the open end tuning is completed, the tool must be calibrated with the open end extension attached.

## Performing open end tuning

1. On the Home view, select the Tool Tab. Then, select the tool to be tuned and go toOpen End Tuning.

2. Select Perform, and then press the trigger on the tool.

3. Follow the instructions on the screen and keep pressing the tool trigger until the open end tuning is done.

   - If the open end tuning is successful, an OK event is displayed.

   - If the open end tuning is not successful, or the tool trigger is released before the tuning is done, an NOK event is displayed.