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Definition of EMI Filter

    Components

    • Capacitors and inductors are the essential components of all EMI filters. Working together, these two, passive, electrical components resist high frequency noise. Ultimately, only non-disruptive, low frequency energy enters the sensitive electrical device.

    Applications

    • There are many examples of electrical equipment that benefit from EMI filters. The list includes computers, AM radios, pacemakers and equipment on satellites. Well-designed groups of capacitors and inductors block high-frequency radio noise from interfering with them.

    Approval Authorities

    • Several approval authorities rate and certify EMI filters, including Underwriters Laboratories and the Canadian Standards Association. The specifications they inspect for are voltage limits, current limits and insertion loss (power loss just from power entering the filter).

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