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BCT-ETX-C3-XXX
S
INGLE
B
OARD
C
OMPUTER
I
NSTALLATION
EMC
I
SSUES
The enclosure in which the board is mounted will have a significant effect on the electro-magnetic
compatibility of the final system. For best effect it should be electrically conducting and provide a complete
screen around the electronics. Apertures should be kept to a minimum and as small as possible. For
ventilation purposes, many small holes are far more preferable to a few large holes.
It is the maximum dimension of an aperture that governs the lowest frequency that can pass through the
enclosure (either in or out). This is irrespective of the width of the aperture. Even a narrow gap between
two sections of an enclosure can leak radio interference. Large apertures will significantly reduce the
electro-magnetic compatibility of the system.
The major contributor to EMC problems will be cables entering and leaving the enclosure. To minimise
these effects ensure that any external cables are fully screened, and that the screen is electrically connected
to the chassis. Full wire-screened cables are much more effective than those with a foil screen and drain
wire. Use metal connector shells/covers, and do not allow the external screen to pass into the enclosure.