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)

International