What is Electromagnetic Interference?

Electromagnetic Interference (EMI) refers to unwanted electromagnetic energy that disrupts the normal operation of electronic devices. It can be caused by various sources, such as electrical circuits, radio frequency signals, and electrical appliances. EMI can interfere with communication signals, leading to data loss, signal degradation, or malfunctioning devices. To minimize the impact of EMI, devices often use shielding, grounding, and filtering techniques to block or reduce the interference. In industrial and networking environments, managing EMI is crucial to ensure the reliability and stability of communication and control systems.

Devices can have EMI certifications to ensure that the product meets established standards for electromagnetic emissions and immunity. These certifications help guarantee that devices will not cause significant interference with outer electronic equipment and remain functional in the presence of external interference.

Here a few EMI Certifications:

1. EN 55011 + BS EN 55011:
   • Covers EMC requirements for ISM equipment.
2. EN 55011 Class A:
   • Suitable for equipment used in commercial or industrial environments, but not in areas with sensitive electronics that are vulnerable to EMI.
3. EN 55032 + BS EN 55032
   • Covers EMC requirements for devices such as Computers, Audio, and Video equipment.
4. EN 55032 Class A
   • Class A devices are used in higher EMI emissions levels, such as industrial settings or business offices.
5. EN 55032 Class B
   • Class B devices have lower EMI emissions to ensure they do not interfere with sensitive household or personal electronics.
6. EN 61000-6-4 + BS EN 61000-6-4
   • Ensures devices do not cause or suffer from interference in industrial, and harsh environments.
7. FCC Part 15
   • US commission the controls EMI emissions from electronic devices.
8. FCC Part 15 Subpart B class A
   • Ensure limits for radiated and conducted EMI emissions from non-consumer devices.
9. ICES-003 Issue 7
   • Canadian Standard for controlling EMI emissions from information technology equipment (ITE).

Content created by Mike Day