Propagation of electromagnetic interference
Three components have to be present for interference to occur in a system:
• Interference source
• Coupling path
• Interference sink
If one of the components is missing, e.g. the coupling path between the interference source
and the interference sink, the interference sink is unaffected, even if the interference source
is transmitting a high level of noise.
The EMC measures are applied to all three components, in order to prevent malfunctions
due to interference. When setting up a plant, the manufacturer must take all possible
measures in order to prevent the occurrence of interference sources:
• Only devices fulfilling limit class A of VDE 0871 may be used in a plant.
• Interference suppression measures must be introduced on all interference-emitting
• The design of the system must be such that mutual interference between individual
Information and tips for plant design are given in the following sections.
System Manual, Release 04/2006, J31069 D0166-U001-A2-7618
Propagation of interference
devices. This includes all coils and windings.
components is precluded or kept as small as possible.
RF300 system planning
4.6 EMC Directives