Meaning
Engineering standards define the limits for electromagnetic energy radiated by an electronic device and the ability of that device to function near other sources of interference. Achieving emc compliance ensures that a product does not disrupt radio communications or cause malfunctions in nearby hardware. It is a mandatory requirement for selling electronics in major global markets.
Radiation Testing
Measurement of electromagnetic fields occurs in specialized chambers to verify that emissions stay below legal thresholds. For emc compliance, the device is tested across a wide spectrum of frequencies to capture both intentional and unintentional signals.
Shielding Effectiveness
Metal enclosures or specialized coatings block unwanted energy from entering or leaving the circuit board. Maintaining emc compliance often depends on the quality of these physical barriers and the grounding of the internal components.
Certification Log
Manufacturers must keep a technical file containing all test results and the declaration of conformity. This record of emc compliance is reviewed by regulatory auditors during market surveillance to ensure that the production units still match the original prototype. If a hardware change is made to the design, a new series of tests is usually required to prove that the shield still performs to the original specification.
Failing to maintain this documentation can lead to a recall of the product from the market.
