Keith Armstrong

Keith Armstrong started Cherry Clough Consultants  in 1990 to help manufacturers reduce costs, timescales and warranty costs whilst complying with the EMC Directive and other regulations. His credentials include: BSc(Hons)Elec.Eng. 1972 (Imperial College, London); Member IEE (now IET): 1977;UK Chartered Engineer: 1978; European Engineer (Group 1): 1988; Member IEEE EMC Society: 1997;  Member IEEE Product Safety Engineering Society: 2003; Chair IET Working Group on “EMC and Functional Safety” UK representative on the IEC teams for: IEC 61000-1-2 (EMC & Functional Safety, MT15), and IEC 60601-1-2 (EMC for Medical Devices, MT23); President of the EMC Industries Association: 2008/9; Member of Technical Panel, IET Professional Network on; EMC Member of Technical Panel, IET PN on Functional Safety Member of EMC Test Labs Association. Keith has a great deal of experience with the EMC of control panels, systems and installations, of all types and sizes, and with Tim Williams wrote the textbook: “EMC for Systems and Installations” (Newnes, 2000, ISBN 0-7506-4167-3,, RS Components P/No. 377-6463).



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Shielding and Filtering Are Not Independent of One Another

I have lost count of the number of times I have been asked to fix an EMC problem, only to find that a shielding box has been designed or purchased to provide XdB up to fMAX. Or a filter has been designed or purchased with a similar specification, but to reduce cost the filter has been mounted on a printed circuit board (PCB) inside the box, with a cable from it entering or exiting the box through a plain connector.

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