EMI stands for Electro Magnetic Interference, this is usually in the form of voltage coupling via capacitance or it could be induced voltages from magnetic fields surrounding wires carrying currents. Suppose you have two wires running parallel to each other, if one is carrying a large high frequency current it will introduce a voltage in the other wire, via its magnetic field. Putting a metallic screen between them will stop this form of interference. If the screen is not earthed, the "live" wire will couple via capacitance a voltage on to the screen and the screen will transfer some of this voltage to the other wire via a capacitance. Earthing the screen will stop this as well.
Frank
absolutely but what's the keyword?google?
Klaus
absolutely but what's the keyword?
EMI stands for Electro Magnetic Interference
this can act as a HF filter in both directions.why it link both line to ground via capacitors(100nf)?
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