Electromagnetic Compatibility - Introduction

Introduction

While electromagnetic interference (EMI) is a phenomenon - the radiation emitted and its effects - electromagnetic compatibility (EMC) is an equipment characteristic or property - to not behave unacceptably in the EMI environment.

EMC ensures the correct operation, in the same electromagnetic environment, of different equipment items which use or respond to electromagnetic phenomena, and the avoidance of any interference effects. Another way of saying this is that EMC is the control of EMI so that unwanted effects are prevented.

EMC divides into a number of issues:

  • EMI is the radiation emitted and its effects on the victim.
  • Emission is the unwanted generation of electromagnetic energy by some emitter or source.
  • Susceptibility or Immunity is the ability of the receptor or victim equipment to operate correctly in the presence of electromagnetic disturbances. Susceptibility and immunity are opposites - an equipment which has high susceptibility has low immunity, and vice versa.
  • Coupling is the mechanisms by which EMI is able to travel from source to victim.

Besides understanding the phenomena in themselves, EMC also addresses the countermeasures, such as control regimes, design and measurement, which should be taken in order to prevent emissions from causing any adverse effect.

Read more about this topic:  Electromagnetic Compatibility

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