BLUE CHIP AOP-12D, User Manual, Page: 11 / 49

Specification Page
5
Blue Chip Technology Ltd. 01270146.doc Page 5
ELECTROMAGNETIC COMPATIBILITY (EMC)
This product meets the requirements of the European EMC Directive
(89/336/EEC) and is eligible to bear the CE mark.
It has been assessed operating in a Blue Chip Technology Icon industrial PC.
However, because the board can be installed in a variety of computers, certain
conditions have to be applied to ensure that the compatibility is maintained. It
meets the requirements for an industrial environment ( Class A product) subject
to those conditions.
•
The board must be installed in a computer system which provides screening
suitable for the industrial environment.
•
Any recommendations made by the computer system manufacturer/supplier
must be complied with regarding earthing and the installation of boards.
•
The board must be installed with the backplate securely screwed to the
chassis of the computer to ensure good metal-to-metal (i.e. earth) contact.
•
Most EMC problems are caused by the external cabling to boards. With
analogue boards particular attention must be paid to this aspect. It is
imperative that any external cabling to the board is totally screened, and that
the screen of the cable connects to the metal end bracket of the board and
hence to earth. It is recommended that round screened cables with a braided
wire screen are used in preference to those with a foil screen and drain wire.
Use metal connector shells which connect around the full circumference of
the screen; they are far superior to those which earth the screen by a simple
“pig-tail”. Standard ribbon cable will not be adequate unless it is contained
wholly within the cabinetry housing the industrial PC.