The example below is a noise suppression model of a fax machine. As
shown, there are many cables inside the facsimile which are notorious
for generating EMI noise. The noise is generated from the main board
and conducted to the cables where it then radiates acting as an
antenna.
It is necessary to install EMI filters on the cable ports in addition
to improving GND connections. It is also necessary to install EMI
filters on the main board's digital circuits. |
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