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]>
