4T and 4Tx Tracer - Frame Size and Axis Calibration

 This selection provides for the automatic calibration of the frame size and for either automatic or manual calibration of the frame axis. This calibration procedure requires use of the frame calibration plate.  The frame calibration plate is a frame style template that contains a circular hole with a diameter of approximately 55 mm in the right eye position.  The left eye position is a partial circular hole with a diameter of approximately 71 mm with a flattened bottom portion.  

There are two available methods for calibrating the frame axis: AUTO and MANUAL.  In AUTO mode, the tracer computes calibration values and stores them in its memory.  In manual mode, the axis calibration values will not be stored, but can be keyed in manually using the “Advanced Calibration” screen.   The tracer is shipped with the axis calibration method set to MANUAL.

 The instructions displayed on the screen will step you through the calibration procedure.  The following is an overview of the steps: 

1. Mount the frame calibration plate as you would a frame, with the smaller circle positioned in the right eye position.    Make sure that the alignment mark is aligned with the front vinyl-covered pin on the right frame holder insert. Assure that the plate is seated completely down into the “V” created by the vinyl-covered pins. 

2. Enter the “Cal Values” as printed on the plate.  After you have done this once, the tracer will remember these values.  Note, if your plate does not have a dual set of numbers labeled at each eye position or does not specifically state “Cal Value,” the single numbers labeled on the plate should be considered the Cal Values.

3. Enter the axis calibration method you want (AUTO or MANUAL)—unless you suspect the axis is not calibrated correctly, leave this field at the factory default (MANUAL).  The MANUAL selection will bypass the axis calibration, leaving the axis values the same. 

4. Press the START soft key to begin calibration tracing. 

5. The right eye will be traced, and the “PROCESSING DATA” message will be displayed.  The left eye will not be traced until the right eye data has been processed. 

6. The left eye will now be traced and the “PROCESSING DATA” message will again be displayed. 

7. Steps 4 and 5 may be repeated, depending on the version of your software. 

8. The “CALIBRATION COMPLETE” message will be displayed and the program will return to the Calibration Menu. 

9. Remove the calibration plate.