Electromagnetic interference (EMI) - definition
Electromagnetic interference (EMI) - definition
Electromagnetic interference (EMI) is a phenomenon involving the disruption of the operation of electronic devices or signal transmission systems by unwanted electromagnetic radiation from external sources. EMI can occur in two forms: conducted, when disturbances propagate through power lines or signal cables; or radiated, when they travel as electromagnetic waves through space. These interferences may originate from natural sources such as lightning discharges or from artificial sources like motors, switching power supplies, relays, or radio transmitters.
Electromagnetic interference is particularly critical in the design of electronic and telecommunication systems, as it can cause data transmission errors, malfunctioning of devices, data loss, or complete system failure. Susceptibility to EMI depends on the type and design of the circuit, shielding effectiveness, cable routing methods, and the quality of noise filtering techniques.
To minimize the effects of EMI, various engineering measures are employed, including electromagnetic shielding, signal filtering, galvanic isolation, the use of twisted pair cables, and adherence to electromagnetic compatibility (EMC) guidelines. In engineering practice, EMI is analyzed both in terms of the emissions generated by a device and its immunity to external disturbances. International and European standards, such as those issued by IEC, CISPR, and EN, define permissible emission levels and testing requirements for different classes of electronic and industrial systems. Electromagnetic interference remains a key issue in ensuring the reliability and safety of modern electronic systems, especially in environments with high densities of electronic devices.
Transfer Multisort Elektronik (TME) is one of the world’s largest global distributors of electronic components, electrotechnical parts, workshop equipment, and industrial automation. The catalog includes over 1,500,000 products from 1,300 leading manufacturers. TME’s modern logistics centers in Łódź and Rzgów (Poland), with a combined area of over 40,000 m², ship nearly 6,000 packages daily to customers in more than 150 countries.
TME also invests in the development of knowledge and skills of young engineers and electronics enthusiasts through the TME Education project, and supports the tech community by organizing the TechMasterEvent series, promoting innovation and experience exchange.
