EMC
The need for EMC has grown exponentially in recent history
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EMC’s cause and effects are important, and distributors can helpmeet these challenges faced by today’s purchasing professionals By Jeffrey Ray, TTI
EMC is an acronymthat has asmany misinterpretations of itsmeaning as it has misunderstandings about its applications. This article will attempt to outline why understanding EMC’s cause and effects are so important; what solutions are available; and how distributors can helpmeet these challenges faced by today’s purchasing professionals and design engineers.
Electromagnetic compatibility (EMC) is a
study of the unintentional generation and/or reception of electromagnetic energy, specifically focusing on the undesired effects thatmay be caused by this unwanted electromagnetic energy. Today’s designers and buyersmust ensure theirmanufactured goods operate correctly even whenmated to different equipment or in an environment surrounded by electromagnetic interferences.
Two main issues
There are basically two EMC issues to deal with: emission and susceptibility. EMC emission is the generation (source) and EMC susceptibility is the reception (victim) of electromagnetic interference / electromagnetic noise. Electromagnetic
noise is created by rapid voltage or current changes and it resonates throughout the host electronic equipment and can spread to other equipment via various interconnect points. Regardless of whether your EMC design is targeted at the source or the victimof the electromagnetic noise, breaking the path of the interference is the objective. However, the best EMC designs will be deployed equally against potential emitters and potential victims.
The types of electromagnetic interference
can also be grouped into categories. The disturbance could be either transient pulse or continuous in nature. Transient pulse interferences arise when a short duration pulse is emitted. Examples of transient pulse interference are: electrostatic discharge (ESD), lightning strike,motor start up and various other power line spikes. Continuous interference arises when a more regular interruption occurs usually over a range of frequencies. Classifications of the various types of continuous interference would be: audio frequency (low frequency), radio frequency (20 khz and above) and broadband noise (across both frequency range spectrums). The
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