Recall from school that the H field roll off is third order. The size of the magnets is small, about 1/8 inch on the ones I have.For comparison, the speaker magnetics in some smart phones are a bit larger and stronger. And the phone NFC, near field communication, uses AC magnetic fields. Oh, and those speaker and power port magnetics are DC.Another comparison, the shoplifting detector devices at the doors of many retail shops are not DC, but AC magnetic fields that tends operate at about 15-25 kilowatts. So pacemakers and other magnetic sensitive devices are designed to go into a default safe mode of operation if interference is detected. Ps, the devices also have recorders built in which the doctors read for events, and lawyers can use. 3 family members have pace makers, etc. I am not concerned for their safety. The lawyers put the statements to say you were warned as a defense.There is an abundance of caution with all concerned since there is an assumption of life safety of the public. Testing for life safety is done by proxy and gross assumptions. After thought, the old CRT TV's had strong magnetic fields and no warnings either. And probably no pace makers in that time. Mains power lines running overhead make magnetic fields at 50/60 hertz, as does your kitchen oven, similar to human heart rate.
Sent from Yahoo Mail on Android On Thu, Nov 3, 2022 at 12:32, Dan Roman<[email protected]> wrote: <!--#yiv0588216460 _filtered {} _filtered {}#yiv0588216460 #yiv0588216460 p.yiv0588216460MsoNormal, #yiv0588216460 li.yiv0588216460MsoNormal, #yiv0588216460 div.yiv0588216460MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;}#yiv0588216460 a:link, #yiv0588216460 span.yiv0588216460MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv0588216460 a:visited, #yiv0588216460 span.yiv0588216460MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv0588216460 span.yiv0588216460EmailStyle17 {font-family:"Times New Roman", serif;color:windowtext;font-weight:normal;font-style:normal;text-decoration:none none;}#yiv0588216460 .yiv0588216460MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered {}#yiv0588216460 div.yiv0588216460WordSection1 {}--> Hello list! I have a relative with an implanted pacemaker/defibrillator who recently got a fitness tracker that has a magnet for attachment/alignment of the charging cord. There are warnings in the user manual advising against people with pacemakers using this product because of the magnets, which I assume are fairly strong rare earth types. I looked up the DoC for the tracker and the EM field human exposure standards EN 50663 and EN 62479 are listed on the DoC. My question is do these standards and the similar IEC 62233 give a reasonable assurance that a pacemaker would not be interfered with or are these standards purely concerned with biological effects on the human body only? I would expect the pacemaker to be immune to a certain extent if it is FDA listed and complies with IEC 60601-1-2. I don’t know the model number of their device but I would expect them all to be similar. Do they need to send back their fitness tracker? Or is the warning just thrown in because the lawyers wanted it? Although products I work on need to meet these types of standards, I don’t have much familiarity with these exposure standards because my products have never failed Regards, Dan ______________________________________________________ Dan Roman, N.C.E. Senior Member IEEE Product Safety Engineering Society mailto:[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.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
