Hi John: No, the article doesn't mention field strength. However, the test procedure is one I'm not familiar with: ANSI C63.18-1997, 'American national standard recommended practice for an on-site, ad hoc test method for estimating radiated electromagnetic immunity of medical devices to specific radio-frequency transmitters' In short, they vary the separation between the RFID device and the medical equipment from 600 cm (20 feet) down to 0 cm (touching the equipment case), and record the distance where the equipment failed. Random RFID devices, random power levels, with a test distance down to zero?
I appreciate RFID interference is something to be considered. However, it's not fair to compare the immunity standard used in the report, to the pass/fail testing with the fixed amplitude/fixed distance conditions in present IEC immunity tests (mentioned elsewhere in the email thread.) Pat Lawler EMC Engineer SL Power Electronics Corp. John Woodgate <[email protected]> wrote on 06/27/2008 09:28:20 AM: > In message <[email protected]>, > dated Fri, 27 Jun 2008, "Dean Gerard (Medical Physics)" > <[email protected]> writes: > > > >Whilst I've seen the original article (Journal of the American Medical > >Association), unfortunately I can't circulate it without breaking our > >subscription license agreement. > Thanks for the information you have given, anyway. The elephant in the > room is the field strength information. Is there anything about that in > the paper? > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > Either we are causing global warming, in which case we may be able to stop it, > or natural variation is causing it, and we probably can't stop it. You choose! > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
