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Variations in the relative height of a twisted pair EC wire with respect to an electrical reference plane in the board can drastically affect the electrostatic discharge immunity.
English (United States)
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ESD Shield for EC Wires
Variations in the relative height of a twisted pair EC wire with respect to an
electrical reference plane in the board can drastically affect the electrostatic
A solution to this problem is to provide a metal-coated sheet of very thin
plastic, for example, a Mylar (registered Trademark of EI duPont) film which is
pressed onto the board by foam inserts in the back cover, or by an air bladder in
the back cover. The plastic film is next to the board to avoid short circuits, and
the metal layer is electrically connected to the reference or ground plane in the
board. The reference plane for the wires would accordingly be only the thickness
of the plastic, e.g., 0.002 inches from the wires.