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EMC includes two requirements:

(1) On the one hand, it refers to the fact that the electromagnetic interference generated by the equipment during normal operation cannot exceed a certain limit (EMI) to the environment it is in;

(2) On the other hand, it refers to the device having a certain degree of immunity to electromagnetic interference present in the environment, namely electromagnetic sensitivity (EMS).

1EMC (Electromagnetic Compatibility)

Electromagnetic Compatibility (EMC), abbreviated as EMC, refers to the ability of a device or equipment to operate simultaneously with other devices without being affected by electromagnetic interference issues. EMC (Electromagnetic Compatibility) also includes EMI (Electromagnetic Interference) and EMS (Electromagnetic Tolerance). Specifically, it is to surround the interference sources of components, circuits, assemblies, cables, or the entire system with shielding bodies to prevent the electromagnetic field from spreading outward; Wrap the receiving circuit, equipment, or system with a shielding body to prevent them from being affected by external electromagnetic fields.

IIEMI (Electromagnetic Interference)

An electromagnetic signal with adverse functions appears during the operation of a device or equipment, which is unwanted and meaningless. It may come from the outside world or from itself. These electromagnetic signals will interact with electronic components and cause interference, known as EMI (Electromagnetic Interference). For example, the common "snowflake" on TV screens indicates that the received signal is being interfered with.

Electromagnetic interference can be considered in two directions:

·CE (Conducted Emission): Conducted radioactivity, conducted interference refers to the coupling (interference) of signals from one electrical network to another through a conductive medium.

·RE (Radiated Emission): Radiated radiation, radiation interference refers to the interference source coupling (interfering) its signal to another electrical network through space.

IIIEMS (Electromagnetic Tolerance or Sensitivity)

EMS (Electro Magnetic Susceptibility) refers to the ability of a device or equipment to operate without being affected by the surrounding electromagnetic environment. Electromagnetic tolerance can be considered in two directions:

·CE (Conducted Susceptibility): Conducting radioactivity

·RE (Radiated Susceptibility): Radiated radioactivity