International Standards and Conformity Assessment for all electrical, electronic and related technologies
Electromagnetic Compatibility


Electromagnetic Compatibility


EM disturbance phenomena categories


Note: For most products the first five categories of phenomena should be considered, while test methods for the particular phenomena of nuclear high-altitude electromagnetic pulse and other high-power EM transients have been developed for use by product committees under special circumstances.


1. Conducted low-frequency phenomena
  • Harmonics, interharmonics
  • signalling systems
  • Voltage fluctuations
  • Voltage dips and interruptions
  • Voltage unbalance
  • Power frequency variations
  • Induced low-frequency voltages
  • DC in AC networks
2. Radiated low-frequency field phenomena
  • Magnetic fields
    • continuous
    • transient
  • Electric field
3. Conducted high-frequency phenomena
  • Directly coupled or induced voltages or currents
    • continuous wave
    • modulated waves
  • Unidirectional transients *
  • Oscillatory transients *

* Single or repetitive (bursts)


4. Radiated high-frequency field phenomena
  • Magnetic fields
  • Electric fields
  • Electromagnetic fields
    • continuous wave
    • modulated waves
    • transients
5. Electrostatic discharge phenomena (ESD)
6. High-altitude nuclear electromagnetic pulse (HEMP)