As the C80 uses a Projected Capacitive touch screen, it has stricter grounding requirements than resistive screens.
The difference lies in their operating principles:
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Resistive Screens work based on physical pressure. When you press down, two layers physically touch to close a circuit. Because they rely on mechanical contact, they are immune to electrical noise.
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Capacitive Screens (like the C80) work by detecting minute electrical changes (micro-currents) from your body. They act as sensitive sensors and require a stable reference ground to function. Without proper grounding, electrical interference (noise) from the power supply can mask the touch signal, causing malfunctions.
If you are bench-testing the unit, please try holding the back housing of the C80 case with your left hand while operating the screen with your right. Does the touch input issue still occur?
If so, please check that both the 24V power supply and the C80 unit itself are properly grounded. This applies whether the unit is on a desk or mounted in an electrical cabinet.
Note that the C80’s grounding tab is located behind the power interface; please make sure to use a proper crimp terminal for a secure ground connection.
