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Handheld Terminal CE Conformity, Directives and Standards
User's Manual, Version: 1.3 149
© KEBA 2007
14.3 Electromagnetic Compatibility
The European Union obligates its member states to harmonise their statu-
tory provisions in respect of electromagnetic compatibility by means of Di-
rective 89/336/EC (will be replaced by the new Directive 2004/108/EC from
20.7.2007). In the following text this Directive is abbreviated to the EMC Di-
rective.
All electrical and electronic device that is put into circulation in Europe
must, therefore, conform to the fundamental safety requirements of the
EMC Directive. According to this Directive, electromagnetic compatibility is
the ability of a device, plant or system to work satisfactorily in the electro-
magnetic environment, without itself causing electromagnetic interference
that would be unacceptable to all devices, plant and systems present in this
environment.
In addition to the legal requirements described above, the reliable function-
ing of an electrical device is also a fundamental quality characteristic of
such a device.
As well as basic information concerning electromagnetic compatibility, the
following pages describe the implementation of the EMC requirements in
respect of the KeTop product range of handheld terminal devices.
14.3.1 The electromagnetic environment – interference sources, interference
sinks and coupling paths
There are a number of artificial and also natural sources of interference in
the electromagnetic environment that can affect electrical and electronic
device.
The most well-known natural interference phenomenon is atmospheric dis-
charge (lightning discharge).
Artificial sources of interference are, on the one hand, intentional, such as
mobile radio, amateur radio, TV and radio transmitters, and, on the other
hand, unintentional, such as microwave ovens, arc welding, ignition sys-
tems, high voltage device, electric motors, electronic device and also elec-
trostatic discharge.
14.3.1.1 Atmospheric discharge (lightning)
Atmospheric discharge can take place directly or indirectly on power and
communication lines. The consequence of such an impact if there is insuffi-
cient protection is the destruction of the electrical device.