X-Series All Weather User Guide 15 150-092
3.2
Installing the TSHARC™ Driver (Cont’d)
Calibration Options
Three point calibration option -
Use for a quick calibration of a known good touch screen
overlay.
Four point calibration -
The 4-point calibration
program will compensate for some irregularities in
a touch screen overlay resistance. Use in
conjunction with the “distance from edge” selection
to adjust for Trapezoidal and/or skew correction. If
there is still a problem with your touch screen, try
the 20-point calibration and the skew control.
Seven point calibration -
Standard calibration. More
accurate than 3 point.
Twenty point calibration -
Use the 20-point
calibration when you have a non-linear screen,
which may not be registered to a display properly.
This will give you the most accurate calibration.
Note: This calibration should be used to correct a
moderately defective or damaged touch screen
overlay.
Distance from the edge
- 4, 5 and 8 wire touch screens are constructed using various
materials and linearization patterns. Some manufacturers linearization patterns cause a
straight line to “bow” near the edges of the overlay. Because of the varied linearity that
exists between touch screen types, it may be necessary to calibrate the edges of the
touch screen more concisely. By allowing the user to calibrate the edges using the
“distance from the Edge” setting the TSHARC drivers can correct for this non-linearity.
Experiment with this setting to find the desired result.
Calibration Process
If this screen appears while attempting to calibrate your
touch screen, you have multiple touch screen controllers
connected. Choose the touch screen controller location
that you would like to calibrate
As discussed in the previous section, Hampshire TSHARC
drivers are equipped with various calibration algorithms
that will provide accurate touch location data even in cases when the touch screen
overlay is damaged or defective. Touch the calibration points as accurately as you can as
they appear on the screen.
