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  • BSI Flex 1903 v1:2023-08 formally released

    This is an interactive version 1 of BSI Flex 1903 v1.0:2023-08. The aim of the standard is to create a lexicon of standard terms and acronyms used in this sector.

    We welcome your engagement and comments on this version to help inform the development of the next version. Comments on clauses or terms in the standard should be made via the BSI Standards Development Portal. We would also welcome general feedback including what terms could be considered for future versions and these can be made through our dedicated feedback page.

electromagnetic interference (EMI)



  • Definition

    degradation in the performance of equipment or transmission channel or a system caused by an electromagnetic disturbance


    NOTE 1 EMI sources can be either manmade (intentional or unintentional) sources of naturally occurring phenomena such as lightning or solar flares.

    NOTE 2 The three main types of EMI are radiated EMI, conducted EMI and coupled EMI

    NOTE 3 On an  “uncrewed aircraft (UA)” (3.1.82), undesirable EMI effects may include but are not limited to: the command and control (C2) link (3.1.22) , the flight controller, navigation controller, power distribution board, electronic speed controllers and autopilot flight control inputs

    NOTE 4 UA payloads are designed and tested to avoid the inadvertent transmission of any “electromagnetic interference (EMI)” (3.1.41)  that affects the control of the UA.

    [SOURCE: International Electrotechnical Commission (IEC) 60050 - International Electrotechnical Vocabulary] ) [16]

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