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E l o E n t u i t i v e T o u c h m o n i t o r
Routing the Touchscreen Cables
The internal cable(s) that carry the analog touchscreen signals are subject to
interference from various sources within the monitor. The routing of these
cables should avoid the following areas, listed in order of importance:
• the flyback transformer
• the anode lead
• the inverting section of the power supply (most monitor power supplies are
switching power supplies, and the main DC to AC inversion section produces
most of the noise).
• the yoke
• the RGB video drive section of the monitor.
• the video input cable.
• the horizontal and vertical oscillator/drive sections
• the degaussing coil wiring.
Obviously, it may not be possible to avoid all these areas simultaneously. Watch
carefully for fluctuation in the touch coordinates when a stationary touch is
applied which would indicate potential noise problems. Once acceptable cable
positioning is determined, tie the cable down to avoid movement during
shipment.
In addition to careful cable routing, other EMI suppression techniques may be
necessary to satisfy agency approval requirements. Use ferrite beads or other
radio frequency (RF) suppression elements, additional shielding, and different
grounding techniques as needed.
Summary of Contents for AccuTouch 821615-000
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