SYSTEM UTILITIES Calibration The system should be calibrated monthly or whenever the system is moved. The calibration system is automatic. Click on ‘calibration’ from the system utilities menu. Place the calibration unit on the chinrest and click on ‘continue’. You will then align and focus on the 55.06 D. sphere on the calibration unit and press the button on the top of the joystick. It will automatically make the other readings and do the calibration. This takes about 20 minutes.