All Things EMC - Electromagnetic Compatibility Basics

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Electromagnetic Compatibility

      Electromagnetic Compatibility or EMC is the ability for electronic or electrical systems to function in its designed electromagnetic environment without damage or deterioration in function. This large category of phenomena occur for a variety of reasons under a diverse set on conditions. For engineers designing electrical systems and products it is crucial that their product continue to function, or show immunity, to these types of electrical occurrences. A commonly thought of way to view immunity, is what equipment is taking in through it's environment. The opposite of immunity is emissions, what is being put out in the environment. 

      Electromagnetic Compatibility EMC Diagram comparing immunity & emissions

      Both radiated and conducted means of transfer apply to both emissions and immunity. Looking at the picture above demonstrates that radiated refers to the transfer via the air and conducted being physically connected. All of these means of transfer have standards associated with them limiting and requiring equipment to meet different specifications. When taking into consideration production of an electronic or electrical system it is crucial to consider EMC during all phases of product development cycle. Once a product is identified as having to meet a specific standard then the proper modifications can be put in place prior to production. A major factor in considering which standards apply to particular product is where and how the product is being used.

      Application

      There is many diverse application of these EMC events used in many industries today. The largest immunity tested is done in the commercial, medical, automotive, military, avionic, and telecommunications sectors.

      The most common type of EMC Immunity testing done is commercial based testing to the International Electrotehnical Commission or IEC standards.These series of standards offer a variety of testing criteria and occurrences that are tested to internationally.

      Common EMC Immunity Standards

        Commercial 

        Automotive

      • ISO 7637 Road vehicles -- Electrical disturbances from conduction and coupling

        Military & Avionic Immunity Testing

        There are a variety of different applications beyond the more commercial based standards including Military/Avionic, Automotive, and many others. These standards are tested to by third party testing labs providing a certification that a product does meet the required specifications. Should a product failure to meet a necessary standard then modifications must be made and the product be resubmitted.

        Contents/Links:

         

        Electromagnetic Compatibility

            Electromagnetic Compatibility or EMC is the ability for electronic or electrical systems to function in its designed electromagnetic environment without damage or deterioration in function. This large category of phenomena occur for a variety of reasons under a diverse set on conditions. For engineers designing electrical systems and products it is crucial that their product continue to function, or show immunity, to these types of electrical occurrences. A commonly thought of way to view immunity, is what equipment is taking in through it's environment. The opposite of immunity is emissions, what is being put out in the environment. 

            Electromagnetic Compatibility EMC Diagram comparing immunity & emissions

            Both radiated and conducted means of transfer apply to both emissions and immunity. Looking at the picture above demonstrates that radiated refers to the transfer via the air and conducted being physically connected. All of these means of transfer have standards associated with them limiting and requiring equipment to meet different specifications. When taking into consideration production of an electronic or electrical system it is crucial to consider EMC during all phases of product development cycle. Once a product is identified as having to meet a specific standard then the proper modifications can be put in place prior to production. A major factor in considering which standards apply to particular product is where and how the product is being used.

            Application

            There is many diverse application of these EMC events used in many industries today. The largest immunity tested is done in the commercial, medical, automotive, military, avionic, and telecommunications sectors.

            The most common type of EMC Immunity testing done is commercial based testing to the International Electrotehnical Commission or IEC standards.These series of standards offer a variety of testing criteria and occurrences that are tested to internationally.

            Common EMC Immunity Standards

              Commercial 

              Automotive

            • ISO 7637 Road vehicles -- Electrical disturbances from conduction and coupling

              Military & Avionic Immunity Testing

              There are a variety of different applications beyond the more commercial based standards including Military/Avionic, Automotive, and many others. These standards are tested to by third party testing labs providing a certification that a product does meet the required specifications. Should a product failure to meet a necessary standard then modifications must be made and the product be resubmitted.