I-Tech IP67 Aluminum User Manual - Calibrating Touch Screen
19” Full IP67 Rugged PC User’s Manual
9
Calibrating Touch Screen
When turning on the Panel PC for the first time, it is highly recommended to calibrate the touch screen to
ensure touch accuracy.
Five-wire resistive touchscreens
The five-wire resistive touchscreens use a glass panel with a uniform resistive coating. A thick polyester
coversheet is tightly suspended over the top of the glass, separated by small, transparent insulating dots.
The coversheet has a hard, durable coating on the outer side and a conductive coating on the inner side.
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When the screen is touched, the conductive coating makes electrical contact with the coating on the
glass. The voltages produced are the analog representation of the position touched. The controller
digitizes these voltages and transmits them to the computer for processing. The five-wire
technology utilizes the bottom substrate for both X and Y-axis measurements. The flexible
coversheet acts only as a voltage-measuring probe. This means the touchscreen will continue
working properly even with non-uniformity in the cover sheet’s conductive coating. The result is an
accurate, durable and reliable touchscreen that offers drift free operation. The touchscreens are
sealed against contamination and moisture. The coversheet is sealed to the glass substrate with an
industrial grade caulk. This prevents wicking of fluid between the coversheet and glass. Also, the
touchscreens are not air vented, thereby preventing fluid ingress through an air vent.
Brief Specifications
Subject
Details
Input Method
Finger, gloved hand, or stylus activation
Positional Accuracy
Standard deviation error is less than 0.080 (2 mm)
Resolution
Touch point density is based on controller resolution of 4096 x 4096
Touch Activation Force
Typically less than 4 ounces (113 grams)
Light Transmission
HL products: 80% +/–5% at 550 nm wavelength Enhanced products: 60%
+/–5% at 550 nm wavelength
Update touch-screen driver or new information. Go to
www.elotouch.com
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