Interference studies – Electromagnetic compatibility (EMC)

A customer services representative

Electromagnetic compatibility is the process of controlling the problems associated with electromagnetic interference. Electromagnetic interference is the result of electromagnetic induction, or electromagnetic radiation, causing a disturbance in a separate electrical circuit. The effects of electromagnetic interference (EMI) vary but can include degrading circuits, limiting their effective performance, obstructing or interrupting signal transmissions. Whilst it can exist in two forms (narrowband and broadband) only one is of regular relevance to the electrical safety sector and that is broadband. Narrowband is the variety of EMI that may impair radio or televisions during broadcast and is usually continuous wave interference, whereas broadband is often pulse or transient is invariably unintentional in nature but certainly necessary to proactively manage. There is a difference between continuous wave interference and repetitive pulse interference caused by continual switching actions within digital electronic circuits; electric motors; pulse trains and engine ignition systems. Causes of non-repetitive broadband electromagnetic interference can include activities from the mundane to cataclysmic: electrostatic discharge where two charged objects interact; power line surges; lightning electromagnetic pulse (LEMP); nuclear magnetic pulse resultant of nuclear explosion; and pulse weaponry.

A common method of controlling electromagnetic interference is by the deployment of coupling or de-coupling, earthing, and shielding to nullify or ameliorate the effects of EMI. As EMC is a complex and highly sensitive issue it is always beneficial to seek the advice of experts and it is for this reason that companies contact Earthing Services; please feel free to contact us via the website or by telephoning the office.