FAQ: How do I delete calibration files?

[Sam]

Corrupt calibration files can occasionally cause issues with the Host PC software. A common symptom is the system working perfectly during calibration but failing to track the eye during the validation or recording stage. The eye's thumbnail image may show a "BOUNDS" error, and the tracking crosshairs typically disappear.

This can happen if a "poor" calibration model is inadvertently accepted, which sometimes occurs with difficult participants like infants. It can also be caused by incorrect screen dimensions or distances being entered on the Host PC.

The solution is to delete the corrupt files after ensuring the Host PC has the correct screen information.

1. First, refer to our FAQ about modifying the screen settings or section 8.4 of your system's installation guide to confirm that the screen settings are configured correctly.
   
2. If you use the screen_dist and screen_phys_coords commands in your experimental script, check you are using sensible values for them.
   
3. Next, delete the old calibration files by following the steps below for your system.
   
   1. EyeLink 1000 Plus and EyeLink Portable Duo
      
      1. On the Host PC, press CTRL+ALT+Q to exit to the File Manager.
         
      2. On your Display PC, open a web browser and navigate to 100.1.1.1 to open the File Manager interface.
         
      3. Navigate to the elcl/exe/ folder and select the "details" view.
            
         
      4. Sort the files by type and select all files with a .cal extension.
            
         
      5. Right-click the selected files and choose Delete.
         
      6. Find and delete the lastrun.ini file as well.
         
      7. Restart the eye-tracking software.
         
   2. EyeLink 1000 and EyeLink II
      
      1. From the Host application, quit to the DOS prompt by pressing CTRL-ALT-Q or clicking the "Exit EyeLink" button.
         
      2. Type the following commands, pressing Enter after each one:
         
         Code:

         DEL *.CAL
DEL LASTRUN.INI
      3. To restart the Host software, type the following command and press Enter:
         
         Code:

         T