And the motor might well be series wound, and have electronic speed control, as my hedge trimmers have. Lots of commutator and switching noise.
Ed Price [email protected] WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Arthur > Michael > Sent: Monday, October 25, 2010 10:38 AM > To: [email protected] > Subject: Re: [PSES] Test Standards for immunity to EMI from TIG and MIG > welders? > > Hi All, > > It's not unusual for a chain saw, electric or gas powered, to be held > close to the upper torso during use. The same can be said for backpack > mounted leaf blowers I suppose. > > Other gas-powered devices (lawn mowers, weed whackers, etc) are > typically > used at quite some distance from the upper torso (I fervently hope). > > Regards, Art > > A.E. Michael, Dir. of Engineering > Product Safety Int'l > 166 Congdon St. East > Middletown CT 06457-2107 U.S.A. > > Phone : (860) 344-1651 > Fax : (860) 346-9066 > Email : [email protected] > Website: http://www.safetylink.com > > ----------------------------------------------------------------------- > --- > > On Mon, 25 Oct 2010, [email protected] wrote: > > > Electric chain saw? > > > > > > > > From: > > "McInturff, Gary" <[email protected]> > > To: > > "[email protected]" <[email protected]>, > > "[email protected]" <[email protected]> > > Date: > > 10/25/2010 09:26 AM > > Subject: > > RE: [PSES] Test Standards for immunity to EMI from TIG and MIG > welders? > > Sent by: > > [email protected] > > > > > > > > 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.pd > f> > > : > > > > "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.pd > f > >> 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/document > s/ > >> 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- > [email protected]>, > > > >>> > >>> 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]>
