Presumably, a regulatory burden is based on a technical issue? Ken Javor Phone: (256) 650-5261
> From: <[email protected]> > Date: Mon, 25 Jul 2011 15:51:44 +0000 > To: <[email protected]> > Conversation: Loudspeaker Certification as Dangerous goods > Subject: RE: Loudspeaker Certification as Dangerous goods > > Ken, > I don't think anyone is admitting hazard from a dc mag. Field, only regulatory > impact. > > > Scott, > We have been challenged on this count because some large steel machine frames > we wanted to ship had a very small residual mag field, either native in the > steel stock or induced by welding. It was a surprise, to say the least. > > Measure your items as they are going to be shipped. That is, packed in their > packing crate. You may be able to use magnetic shunts, or the physical > arrangement of the magnets to lessen the extent of the field outside the > shipping crate. > > It think self-measurement is okay - you will be accountable for your > shipments, no matter who measures. The acceptability thresholds are so low, > you should measure with a stationary meter that has been zero'ed out to local > fields. Then introduce your crate into range at proper distance, setting it on > something that can turn. Turn the crate for your 360, don't move the meter. > > Cheers, > -- > Lauren Crane (mr.) > Product Regulatory Analyst | Corporate Product EHS | Applied Materials > Office 512.272.6540 | Mobile 512.736.7201 | America - Europe - Asia > > -external use- > > ** Save paper and trees! Please consider the environment before printing this > e-mail. > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Ken Javor > Sent: Monday, July 25, 2011 10:32 AM > To: [email protected] > Subject: Re: Loudspeaker Certification as Dangerous goods > > Everyone seems to acknowledge some hazard from a dc magnetic field. For my > own edification, other than compass-safe distance, what is the hazard of a dc > magnetic field to an aircraft? > > Ken Javor > > Phone: (256) 650-5261 > > >> From: Doug Kramer <[email protected]> >> Date: Mon, 25 Jul 2011 08:55:59 -0500 >> To: "[email protected]" <[email protected]> >> Conversation: Loudspeaker Certification as Dangerous goods >> Subject: RE: Loudspeaker Certification as Dangerous goods >> >> Also, keep in mind if you ship multiple speakers in a box, how they >> are positioned in the box relative to each other has a huge effect on the >> fields. >> -Doug Kramer >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On Behalf Of John >> Woodgate >> Sent: Sunday, July 24, 2011 11:07 AM >> To: [email protected] >> Subject: Re: Loudspeaker Certification as Dangerous goods >> >> In message <[email protected]>, dated Sun, 24 Jul 2011, >> Scott Douglas <[email protected]> writes: >> >>> Would it be necessary to measure every speaker, one of a series, or >>> the biggest one we make and use that to cover all? >> >> The strength of the external field depends on constructional details, >> not size. If you need to do tests, you need to test one of every >> product (barring variants with different impedances), at least. >> -- >> 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 When I >> point to a star, please look at the star, not my finger. The star will >> be more interesting. >> >> - >> ---------------------------------------------------------------- >> 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://product-compliance.oc.ieee.org/ >> 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://product-compliance.oc.ieee.org/ >> 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://product-compliance.oc.ieee.org/ > 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://product-compliance.oc.ieee.org/ > 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://product-compliance.oc.ieee.org/ 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]>
