To ensure the electromagnetic compatibility (EMC) of equipment and systems
, it is necessary to define a maximum electromagnetic interference level. This interference level must be guaranteed for any points in a system and ensures that all devices are immune to electromagnetic interference
. The electromagnetic compatibility level (ECL) is the highest expected interference level within a facility, device or system. The electromagnetic interference limits specified in the standards are a compromise.
Reducing the emission limit results in a lower interference level limit, but it increases the costs required by the additional measures.