Magneto?
Michael Sundstrom OHD / TREQ Dallas Electronic Lab Analyst, EMC Lead 2170 French Settelment Rd, Suite B Dallas, Texas 75212 (214) 579 6312 KB5UKT -----Original Message----- From: McInturff, Gary [mailto:[email protected]] Sent: Monday, October 25, 2010 11:25 AM To: [email protected] Subject: Re: [PSES] Test Standards for immunity to EMI from TIG and MIG welders? The medical article is interesting reading in a couple of spots - magnetic fields are noted several places - electric tooth brushes being one of them. Although I don't know that they went far enough - at least in the following case "Chain Saws - Recommend maintaining at least 12 inches (30 cm) separation between the motor and the implant device". Maybe they should add that the cutting bar is 18 inches and should be pointed the other direction :) Why would a chain saw be any more problematic than any small gas powered engine? -----Original Message----- From: Pat Lawler [mailto:[email protected]] Sent: Monday, October 25, 2010 9:05 AM To: [email protected] Subject: Re: [PSES] Test Standards for immunity to EMI from TIG and MIG welders? >From < http://www.med.unc.edu/medicine/card/fellows/patientinstructions/EMI.pdf> : "Note: If you have an ICD [Implantable Cardiac Defibrillator], some strong magnetic fields may cause your device to make beeping tones." Wow - I hope patients know about the possibility of beeping! If I didn't know, and my chest started beeping, I think I'd have a heart attack. Pat Lawler EMC Engineer SL Power Electronics Corp. [email protected] wrote on 10/22/2010 03:12:53 PM: > Page 4 of > http://www.med.unc.edu/medicine/card/fellows/patientinstructions/EMI.pdf > has some welding specific guidelines but no references as to where the > numbers came from. I'd ask the source ( www.guidant.com ) what studies > back up their assertions. Also see > http://www.ncbi.nlm.nih.gov/pubmed/1279591 and > http://samplecode.rockwellautomation.com/idc/groups/literature/documents/ > wp/nets-wp002_-en-p.pdf . > > Orin > On Fri, 22 Oct 2010 13:48:39 -0700 [email protected] writes: > > Though I have seen lots of mentions of electromagnetic emissions by > > welding equipment in the web searches I have done, I have seen no > > quantitative measurements. > > > > The only indirect indication of the level of emissions is the > > immunity > > levels called out in IEC 60974-10 (10 V/m as per IEC 61000-4-3, > > which our > > equipment meets as well). But my guess is that this test is nearly > > redundant for the equipment manufacturers, since I expect the level > > of > > emissions produced during welding to be as much if not more of a > > problem. > > > > Donald Borowski > > Schweitzer Engineering Labs > > Pullman, Washington, USA > > > > > > > > From: > > John Woodgate <[email protected]> > > To: > > [email protected] > > Date: > > 10/22/2010 01:37 PM > > Subject: > > Re: Test Standards for immunity to EMI from TIG and MIG welders? > > Sent by: > > [email protected] > > > > > > > > In message > > <ofb20eb02e.ce4c32e9-on882577c4.0061e8f4-882577c4.00638...@selinc.com>, > > > > dated Fri, 22 Oct 2010, [email protected] writes: > > > > >So my last (and now most important) question is: Is there any > > >literature describing the electromagnetic environment around TIG > > and > > >MIG welders while in operation in the field? > > > > I'm sorry that the IEC standard was inadequate. It's true that the > > welding process in inherently subject to large variations in almost > > > > every characteristic. > > > > I looked at standards related to exposure to EMF from arc welding > > equipment, (such as EN 50444) but I did not find any description of > > the > > environment. > > -- > > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and > > www.isce.org.uk > > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > > If at first you don't succeed, delegate. > > But I support unbloated email http://www.asciiribbon.org/ > > > > - > > ---------------------------------------------------------------- > > 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]> > > > > > > - > ---------------------------------------------------------------- > 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]> - ---------------------------------------------------------------- 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]> - ---------------------------------------------------------------- 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]> - ---------------------------------------------------------------- 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]>
