Vario L3
Precautions
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BIOS & CMOS Memory
Please be aware that with personal computer products, it is possible to create configurations within the CMOS
memory that make booting impossible. If this should happen, clear the CMOS settings; (see the description of
the Jumper Settings for details).
Electromagnetic Compatibility
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 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. Subject to those conditions, it meets the requirements for an industrial environment (Class A
product).
Connector bodies must be securely connected to the enclosure.
The external cabling to boards causes most EMC problems. 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 or the enclosure 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
that connect around the full circumference of the cable screen: they are far superior to those that earth
the screen by a simple “pig-tail”.
The keyboard and mouse will play an important part in the compatibility of the processor card since
they are ports into the board. Similarly, they will affect the compatibility of the complete system. Fully
compatible peripherals must be used otherwise the complete system could be degraded. They may
radiate or behave as if keys/buttons are pressed when subject to interference. Under these
circumstances it may be beneficial to add a ferrite clamp on the leads as close as possible to the
connector. A suitable type is the Chomerics type H8FE-1004-AS.
USB cables should be high quality screened types.
Ensure that the screens of any external cables are bonded to a good RF earth at the remote end of the
cable.
Failure to observe these recommendations may invalidate the EMC compliance.
