I think Ken's rational makes sense to me, since the 51.5 is derived from 20*log(377).
Brent DeWitt, AB1LF Milford, MA -----Original Message----- From: Macy [mailto:[email protected]] Sent: Monday, February 27, 2017 2:54 PM To: [email protected] Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General Use] Accuracy within 1%, if measured outside the source loop by 3X, which is like 'far field' --- [email protected] wrote: From: Ken Javor <[email protected]> To: [email protected] Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General Use] Date: Mon, 27 Feb 2017 13:36:12 -0600 It's valid in the absence of a magnetic material (relative permeability = 1). The 51.5 dB factor is based on the far field. Ken Javor Phone: (256) 650-5261 > From: John Woodgate <[email protected]> > Reply-To: John Woodgate <[email protected]> > Date: Mon, 27 Feb 2017 18:07:27 -0000 > To: <[email protected]> > Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions > [General Use] > > I doubt that, because it's valid at audio frequencies, which > undoubtedly means 'near field'. > > With best wishes DESIGN IT IN! OOO Own Opinions Only > www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England > > Sylvae in aeternum manent. > > > -----Original Message----- > From: Cortland Richmond [mailto:[email protected]] > Sent: Monday, February 27, 2017 6:02 PM > To: [email protected] > Subject: Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions > [General Use] > > On 2/27/2017 12:23 PM, John Macaulay wrote: >> The difference between dB(pT) and dB( A/m) is 2 dB. >> >> dB(pT) -2 = dB( A/m) > > This is > > > true only in the Far Field. > - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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 email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus - ---------------------------------------------------------------- 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.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
