In the automotive electronics industry, Electromagnetic Compatibility (EMC) testing is essential to ensure that components function correctly in complex electromagnetic environments without interfering with other systems. Automotive component EMC testing is primarily divided into two categories: Electromagnetic Interference (EMI) and Electromagnetic Susceptibility (EMS).

Electromagnetic Interference (EMI): “Self-Discipline”
The core purpose of EMI testing is to evaluate whether the interference emitted by a component—either through conduction or radiation—exceeds specified limits. This ensures that sensitive receiving equipment, such as car radios and navigation systems, can operate without disruption.

Electromagnetic Susceptibility (EMS): “Robust Defense”
EMS testing simulates the survival capability of components when exposed to harsh electromagnetic environments (such as radar, base stations, human electrostatic discharge, and power supply fluctuations). It ensures that the component does not malfunction or experience performance degradation.

Component EMC
├───Automotive EMI
│   ├───Radiated Emission (RE)
│   ├───Conducted Emission - Voltage Method (CE-V)
│   ├───Conducted Emission - Current Probe Method (CE-C)
│   ├───Conducted Transient Emission
│   ├───Magnetic Field Emission
│   └───Low-frequency Magnetic Field Emission
├───Automotive EMS
│   ├───Radiated Immunity (RI) - ALSE Method
│   ├───Radiated Immunity (RI) - Reverberation Chamber Method
│   ├───Radiated Immunity (RI) - Bulk Current Injection (BCI) Method
│   ├───Portable Transmitter Immunity
│   ├───Magnetic Field Immunity
│   ├───Conducted Transient Immunity
│   ├───Conducted Transient Coupled Immunity - Signal Lines
│   └───Electrostatic Discharge (ESD)
└───AC Power Port Testing
    ├───Conducted Emission - AC Port
    ├───Harmonic Emission
    ├───Voltage Flicker
    ├───Electrical Fast Transient (EFT) / Burst
    └───Surge