Pat, Thank you for that 'heads up'. 400 A/m is still around 1/2 mT, not the 2 mT I remember.
Interesting reference will now appear in the 'design' documentation ...reference spec: 'internet' I'm just trying to make certain that when the documents are all here and we review my design versus specs, I won't have to start over. So far all is ok. Thanks again. Regards, Robert On Tue, 2 Dec 2008 08:57:54 -0800 pat.law...@slpower.com wrote: > 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. > > emc-p...@ieee.org 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" <brod...@nonin.com> 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: m...@california.com > [mailto:m...@california.com] > > > Sent: Monday, December 01, 2008 2:53 PM > > > To: John Woodgate; emc-p...@ieee.org > > > 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 <j...@jmwa.demon.co.uk> wrote: > > > > In message <web-197812...@california.com>, dated > Mon, 1 > > > > Dec 2008, m...@california.com 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. To post a message to the list, send your e-mail to <emc-p...@ieee.org> 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 <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
