It may be worth noting that in the medium wave broadcast band the FCC limit is over 600 volts per meter. We don't incur inherently harmful induced body currents with less at these frequencies -- unless we're hanging onto an antenna.
But considering the low potentials to be measured, and the energy delivered by a pacer or defibrillator, it seems difficult to adequately filter device leads from all fields they might see, so we have the fall-back constant pacing mode mentioned before. In my opinion, the immunity levels required by the Medical Directive are not unreasonable, even if they may be encountered rarely; one report extant on the Web is of a patient who subjected to search by an airport security wand, which caused his implanted, computerized drug delivery system to deliver a non-survivable level of drugs. Inductive coupling directly to devices and leads is quite probably a harsher environment than being near a broadcast antenna. But all too common! Cortland Richmond 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 emc-p...@ieee.org Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Scott Douglas emcp...@ptcnh.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
