EMC (Electro-Magnetic Compatibility)

Refers to the ability of a device or system to operate in its electromagnetic environment as required and not to cause intolerable electromagnetic interference to any device in its environment.

EMC has two parts：

1. EMI (Electro-Magnetic Interference)

    Refers to the equipment in the normal operation of the environment generated by electromagnetic interference can not exceed a certain limit;

2. EMS (Electro-Magnetic Susceptibility)

    Refers to the device has a certain degree of immunity to the electromagnetic interference in the environment;

So, EMC = EMI + EMS

Three elements of EMC 

The energy emitted by the electromagnetic interference source is transmitted to the sensitive device through some coupling path, which results in some form of response and effect of the sensitive device.

For example:

The absence of any one of the three elements does not constitute an EMC problem. Therefore, when an EMC problem occurs, the solutions to EMC problems can be found through the investigation and analysis of the three elements.

Common EMC test items

Note:

RE: Radiation emission

CE: Conducted emission

Harmonic: Harmonic current

Flicker: Voltage flicker

RS: Continuous RF electromagnetic field disturbances,

CS: Continuous induced RF disturbances

ESD: Electrostatic discharge immunity

EFT: Electrical fast transients/burst

Surge: Surge immunity

Dips: Voltage dips & interruptions

PMF: Power frequency magnetic field

EMC testing standards for common products 

European

North America