I read in !emc-pstc that King, Richard <richard.k...@uk.thalesgroup.com> wrote (in <C02943801230D611919D00508BDF0C246EB5E8@RTWEXCH>) about 'Help wanted with succinct subject description for non-specialists' on Mon, 24 Mar 2003: >EMC is two things: > > - The resistance of a piece of equipment to external Electromagnetic >Interference (EMI) > - The control of a piece of equipment's production of EMI.
Yes, although it's usual to deal with emissions before immunity. > >If two pieces of equipment can operate in the same Electromagnetic >Environment (EME) without degradation in the performance or function of >either, they are said to be mutually Electromagnetically Compatible. Yes. > >To ensure Compatibility it is necessary to carefully design equipment such >that both its susceptibility to, and its emission of EMI is controlled. >Standards exist that define limits for both these aspects. Examples you may >have heard of are the European EMC Directive, which is mandatory for all >electrical hardware sold in the European Union; and the Defence Standard >DEF-STAN 59-41, which many of our contracts refer to. > >In addition to the distinction between emissions and susceptibility, EMI can >be further classified as either conducted or radiated. The former is energy >transferred via wires or other conductors; and the latter refers to >electromagnetic waves propagating through free space. > >EMC is a necessary consideration for projects that deliver hardware. >Furthermore, many of the requirements for EMC are common between projects. >This commonality can be exploited to increase efficiency for individual >projects and across sites. > Fair enough. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
