Hi Robert, 3 A/m is indeed the test level called out in IEC 60601-1-2, the standard used for general medical EMC testing.
However, there are many other medical safety standards in the IEC 60601-2-* series which may have different test levels. My favorite is IEC 60601-2-24:1998, which calls out a test level of 400 A/m ! (Note -- I haven't performed that test, and have no equipment or setup recommendations.) So long as you put in your product spec 'Reference specification for power-frequency magnetic field testing: The Internet', I think you're covered. ; ) Pat Lawler EMC Engineer SL Power Electronics Corp. [email protected] wrote on 12/01/2008 11:14:27 PM: > Brodie, > Thank you very much for your informative reply. > 3 A/m translates to 3.8 microTeslas, correct? > 10 A/m would then be 12.6 uT > > That is indeed benign. For some reason 2 mT had stuck in > my mind and that would have been hard to deal with, > requiring a block diagram change during prototype design > phase. > Thank you again. Your answer has allowed me to jump ahead > on the Project as we wait for Purchasing to complete the > spec purchases. > Regards, > Robert > > On Mon, 1 Dec 2008 14:59:16 -0600 > "Brodie Pedersen" <[email protected]> wrote: > > EN 60601-1 points to IEC 60601-1-2 for EMC test > > requirements. If you > > are making a device for Europe the frequency required at > > 3 A/m is 50 Hz. > > If you want to sell the device in the US it is at 60Hz as > > well following > > the method of IEC 61000-4-8, power frequency magnetic > > fields. If the > > device is life supporting, then the test level is 10 A/m. > > These are > > very benign levels to pass unless you have a hall effect > > sensor built > > into your device. > > > > Brodie Pedersen Quality Manager Product Development > > Nonin Medical Inc. > > > > > > -----Original Message----- > > From: [email protected] [mailto:[email protected]] > > Sent: Monday, December 01, 2008 2:53 PM > > To: John Woodgate; [email protected] > > Subject: Re: EN60601-1 Susceptibility to magnetic fields > > from AC mains > > > > Going to, but need to design NOW, or at least make > > certain > > I'm not painted into a corner later. > > > > > > On Mon, 1 Dec 2008 19:35:37 +0000 > > John Woodgate <[email protected]> wrote: > > > In message <[email protected]>, dated Mon, 1 > > > Dec 2008, [email protected] writes: > > > > > > > > > >What is the requirement for susceptibility to magnetic > > > fields from the AC mains as listed in EN60601-1? > > > > > > It's really dangerous to rely on answers to such > > > questions, even from this erudite community. We can't > > > tell you everything that the standard says, and we > > don't > > > know what is relevant for your product. You DO need to > > > buy the standard and study it. > > > -- > > > 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. 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To post a message to the list, send your > e-mail to <[email protected]> > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to that URL. > Website: http://www.ieee-pses.org/ > 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]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
