Ah, misread the post. You can't convert A/m2 to A/m. = A/m2, current density conversion to field strength, is complex. It is worked out for the human body in the ICNIRP guidelines.
Best regards John [email protected] ***************************************************************** DISCLAIMER: The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorised. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: 03 May 2011 15:49 To: [email protected] Cc: [email protected] Subject: Re: [PSES] A/m Don't confuse A2/m2 with A/m or A/m2. The A2/m2 units were used on analog magnetic field meter readouts since the sensor was a square-law responding device and the meter scale would be linear in FSU2 (field strength units squared). As previously mentioned: 1. A2/m2 is just the square of A/m; both relate to magnetic field strength (H). 2. A/m2 is a current density, typically 'J,' which doesn't simply relate to magnetic field strength, 'H,' in A/m. 3. 'B,' magnetic flux density, is equal to u [mu] x H where mu is the permeability of the medium. In the case of air, water, vacuum, people, etc (most everything but ferrous materials), the value of mu is 4 x Pi x 10exp(-7), [four Pi times ten to the minus 7] which is about 1/800,000. If the units of H are amperes per meter, the units of B are teslas (one tesla is approximately 800,000 amperes per meter). Hope I didn't make things even more complicated... Regards, dB -- Dave Baron, PE Consulting Engineer Electromagnetic Field Safety Voice: 612 568-3416 Mobile: 512 917-8346 Fax: 206 203-0605 [email protected] On May 3 2011, John McAuley wrote: >Hi Bob > > > >I have looked up some more info. These units were common on older Holaday >units. I think they were referenced on standards perhaps ANSI. > > > >61.4 V/m = 3770 V2/m2 > >0.163 A/m = 0.027 A2/m2 > > > >Best regards > >John > >John McAuley > >[email protected] > >***************************************************************** >DISCLAIMER: The information contained in this e-mail may be confidential >and is intended solely for the use of the named addressee. Access, copying >or re-use of the e-mail or any information contained therein by any other >person is not authorised. If you are not the intended recipient please >notify us immediately by returning the e-mail to the originator > > _____ > > > >From: John McAuley [mailto:[email protected]] >Sent: 03 May 2011 13:29 >To: [email protected] >Subject: Re: [PSES] A/m > > > >Hi Bob > > > >Few years since I did this but from memory it is simply the square root. > > > >Best regards > >John > >[email protected] > >***************************************************************** >DISCLAIMER: The information contained in this e-mail may be confidential >and is intended solely for the use of the named addressee. Access, copying >or re-use of the e-mail or any information contained therein by any other >person is not authorised. If you are not the intended recipient please >notify us immediately by returning the e-mail to the originator > > _____ > > > >From: Robert Heller [mailto:[email protected]] >Sent: 03 May 2011 12:18 >To: [email protected] >Subject: [PSES] A/m > > > >Can you convert A/m2 to A/m? > >Bob Heller >3M EMC Laboratory, 76-1-01 >St. Paul, MN 55107-1208 >Tel: 651-778-6336 >Fax: 651-778-6252 >================================= >- >---------------------------------------------------------------- >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]>
