When calibrating the instrument, the colored check tile will be the last item measured. Clicking on the Calibrate command will first cause the program to prompt for a light trap, followed by the white tile. Once these two items have been measured, the program will display the "Calibration Complete" message.
Click on OK. Immediately after you close the "Calibration Complete" dialog box, the check tile file will be opened automatically along with the Read dialog. Read the check tile using the normal read process. The check tile data will be placed into the check tile file. The Read dialog will remain open until you close it; this allows you to see the measurement that has been placed into the file.