GE IC693ALG392 Processor module

Effects on closed shields. The EMP fields incident on a closed shield induces surface currents and charge displacements on the outer surfaces of the shield. If the shield is continuous metal (i. e., it has no opening or discontinuities in its surface) and about 1 mm thick, voltage is induced in circuits inside the shield by these surface currents. f. Effects on insulated penetrating conductors. Conductors, such as power and signal wires, that pass through the shield may allow very large currents and voltages to be delivered to internal circuits. The current on the wire just inside the shield is about equal to the current just outside the shield; the wire is a hole in the shield or, in other words, a 0 decibel (dB) compromise of the shield.

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