Technical Articles
2026.10.05
Topic 2 : What is EMC
• Two Core Parts of EMC :
• EMI (Electromagnetic Interference) : The electromagnetic noise generated by the equipment during operation must not exceed limits to avoid interfering with other
surrounding equipment.
• RE (Radiated Emission) : Tests the intensity of e lectromagnetic waves radiated outwards through space (air) by the product.
• CE (Conducted Emission) : Tests the intensity of electromagnetic noise conducted outwards through power lines, signal lines, and other wires by the product.
• EMS (Electromagnetic Susceptibility/Immunity) : The ability of a device to maintain normal operation without malfunction when faced with electromagnetic interference
from the surrounding environment.
Simply put, a good electronic product must be able to "not interfere with others, and not be afraid of interference from others."
• RI (Radiated Immunity) : Tests the product's ability to resist electromagnetic interference in space (e.g., whether the product will malfunction when a mobile phone is used
nearby).
• CI (Conducted Immunity) : Tests a product's ability to resist interference injected into power lines and signal lines (e.g., simulated lightning strikes, power line surges, noise
from nearby high-power electrical switches).
