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Pilz – Safe automation, automation technology - Pilz INT

Ground and EMI

Ground is presumed to be a “safe haven” for sensitive components. All grounded surfaces and connections are supposed to be “equipotential” i.e. with no voltage difference between them. This assumption may work only for DC. At high frequencies a wire is an inductor presenting impedance, and isolated wires and metal parts are plates of capacitors …

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Pilz – Safe automation, automation technology - Pilz INT

Radiated, Conducted

Radiated emission propagates through the air, conducted one – via the wires or via any other conductor (such as metal parts of equipment). You can’t have one without the other – any voltage or current generates fields, and any field generates voltages and currents in conductors – after all, this how antennas work. The dealing …

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