What is EMC
“Not causing electromagnetic interference to other devices” means that if a device lacks targeted safeguards for this capability, it will generate electromagnetic interference affecting surrounding equipment. EMI (Electromagnetic Interference) is the technical term for this interference. Since this metric relates to electromagnetic wave emission behavior, it is often paired with Emission. Taking a switching power supply as an example, its EMI primarily originates from switching noise generated during the device's switching operation.
In contrast, EMS (Electromagnetic Susceptibility) describes a device's ability to “tolerate external electromagnetic interference.” This metric is typically used alongside Immunity, with the core requirement being that the device does not malfunction or exhibit abnormal behavior even when affected by EMI.
EMI can be categorized into two types: Conducted Emission, referring to noise transmitted through wires or PCB traces; and Radiated Emission, referring to noise directly radiated into the environment. For both types of noise, EMS establishes specific immunity requirements.
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