3M MT7 manual Linearization Process

3M™ MicroTouch™ Software MT 7 User Guide 27

Linearization

With certain controllers, you can perform a linearization to fine-tune your touch sensor. It should be performed only at the direction of 3M Touch Systems, Inc. Technical Support. Linearization consists of touching 25 targets on the display followed by 16 additional points to determine specific point accuracy over the face of the display.

The EX, and some RX series touch controllers support Linearization:

Linearization Process

To perform a 25-point linearization of the sensor:

1.Make sure the video image is centered in the display area using the horizontal and vertical controls.

2.Open the touch control panel and select the Controller tab.

3.Click Linearize. This will bring up, one at a time, 25 linearization targets on the display.

Note: If you press Escape or do not touch the sensor within 20 seconds, the system automatically cancels the linearization process with no change to the current settings.

4.Touch the sensor and position your fingertip to completely cover the green target. When touching the target, make sure you:

a.Face the display directly.

b.Perform the linearization in the position (sitting or standing) you expect to use the sensor.

c.Touch the target firmly and precisely with your fingertip. Be careful to keep your other fingers away from the sensor as you touch the target. Hold a steady touch over the target until you hear a beep or until the target turns red.

5.Repeat these instructions until all 25 targets have been touched.

A dialog will appear asking if you wish to “Test, A ccept, or Cancel”.

∙If you select Accept, then the new calibration settings are automatically accepted.

∙If you select Cancel, the original settings will be restored without change.

∙If you select Test, the 25 targets will now be replaced with a set of 16 targets used to verify the linearization performed in steps 1 through 5.

These targets are yellow to begin with. If you successfully touch the target, it turns green. If you are off, it turns red and returns a percentage error number. If the linearization is not within acceptable tolerances, you should perform the linearization process again.

Repeat the previous process for each of these targets. This process automatically returns to the control panel once complete. If you are using a pen stylus, repeat the linearization procedure with the pen.

3M Touch Systems, Inc. Proprietary Information – 25695M