Good product design incorporates the application of basic EMC principles such as effective shielding, earthing, and filtering will simultaneously improve electromagnetic immunity and reduce electromagnetic emissions, whilst minimizing risk. The result of this would include product failure during tests and in the real world would mean that the product would be unreliable and not work as intended. If a product has to be redesigned, it can be prohibitively expensive and result in delays to market and a loss in consumer confidence.īad product design (from an EMC or EMI perspective) would be when earthing, filtering, and shielding have not been considered. How to design for EMI & EMC to minimize risk The standards used are therefore based primarily on radiated and conducted tests. The two key methods that electromagnetic activity or ‘energy’ can reach a product are through the air (radiative coupling) or via the cabling (conductive coupling). What is an electromagnetic compatibility (EMC) engineer It seemed like a simple question when it was posed to me during the National Association of Radio and Telecommunications. How will the energy travel from the product to its “victim”?.With what/whom is it going to interfere?.What are Sources of Electromagnetic Interference (EMI). Where is this product going to be used? EMI can be defined as electromagnetic energy which affects the functioning of an electronic device.The device’s intended application will determine the exact type of testing required. With the proliferation of electronic devices into everyday life - TVs, washing machines, electronic. All electronic devices have the potential to emit electromagnetic fields. In addition, specific industrial or military standards will apply to the product depending on its target market and therefore also need to be considered.Įvaluating how a device will react when exposed to electromagnetic energy is known as susceptibility or immunity testing and involves determining the ability of a device to tolerate noise from external sources.Meanwhile, emissions testing measures the amount of EMI generated by the device that could affect other electrical products and can provide an accurate measurement of the amount and type of noise generated by a device. Electromagnetic Compatibility, also known as EMC, is the interaction of electrical and electronic equipment with its electromagnetic environment, and with other equipment. CENELEC - Comit Europen de Normalisation Electrotechnique In English, the name of this committee is the 'European Committee for Electrotechnical Standardization'. However, different requirements in the US and the European Union (EU), as well as differing interpretations of the meanings of EMC and EMI, often cause confusion when it comes to testing. The energy generated by a circuit or equipment which is conducted on wires and cables. Failing to consider them in the initial stages of product development can result in the time-consuming and costly need to redesign the product at a later stage to meet EMC/EMI specification tests and prevent product failure or safety risk. Electromagnetic compatibility (EMC) and interference (EMI) are both extremely important design considerations.
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