Completely off-topic, but... The input impedance of a tuned dipole is 72 . That looks more magnetic than electric compared to 377 . Also, if you are in close to the tuned dipole, then you would see magnetic at the center (current maximum) and very high electric at the tips (no current at all).
Now if we are talking an electrically short dipole, then yes, it¹s pretty much all electric. Ken Javor Phone: (256) 650-5261 From: John Woodgate <[email protected]> Organization: J M Woodgate and Associates Reply-To: John Woodgate <[email protected]> Date: Mon, 28 Oct 2019 22:24:51 +0000 To: <[email protected]> Subject: Re: [PSES] Reading or Limit Conversion? That's because of near-field effects. You can often get any result you like (or don't like) when measuring in the near field. And there is no relationship between the electric and magnetic field strengths. Consider a dipole - much electric but hardly any magnetic. Then consider a solenoid - just the opposite. In a truly unperturbed far field, the levels are predictable. The problem of interpolation, extrapolation or some other way of processing the measured results is that, because standards are inconsistent, whichever way you do the processing, it can be challenged. If all the standards were consistent, there would be one standardized process and no possibility of a challenge. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK On 2019-10-28 20:47, Grasso, Charles wrote: > > > > Take the reading. It¹s the only way to be sure.. > > > > It is not unusual for a product to pass @ 3m and then fail at 10m (or vice > versa). > > > > > > Thanks! > > > > Charles Grasso > > W: 303-706-5467 > > > > > > > > From: John Woodgate [mailto:[email protected]] > Sent: Monday, October 28, 2019 1:30 AM > To: [email protected] > Subject: Re: [PSES] Reading or Limit Conversion? > > > > > > This message originated outside of DISH and was sent by: > [email protected] > > > This inconsistency (in the underlying CISPR standards) should be addressed by > CISPR, but it is difficult to get consensus whenever it is discussed. > > Best wishes > > John Woodgate OOO-Own Opinions Only > > J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> > > Rayleigh, Essex UK > > > > On 2019-10-28 07:05, Charlie Blackham wrote: > > >> >> David >> >> >> >> Hmm, different standards appear to deal with this differently: >> >> * EN 55011:2009 section 6.2.2.3 instructs you to normalise the measured data >> to the specified distance in the standard >> * EN 55032:2015 section 9 instructs you to adjust the limits (in fact it >> gives limits for 3 and 10m which are 10 dB apart and not 10.45dB apart if you >> extrapolate using 20LogD) >> * ANSI 63-4:2014 instructs you to extrapolate the results >> >> >> >> If the standard or test method doesn¹t specify, I guess the important thing >> is to be clear in the report as to what¹s been done. >> >> >> >> Regards >> >> Charlie >> >> >> >> >> >> Charlie Blackham >> >> Sulis Consultants Ltd >> >> Tel: +44 (0)7946 624317 >> >> Web: https://sulisconsultants.com/ <https://sulisconsultants.com/> >> >> Registered in England and Wales, number 05466247 >> >> >> >> >> >> >> >> From: itl-emc user group <[email protected]> <mailto:[email protected]> >> Sent: 28 October 2019 06:37 >> To: [email protected] >> Subject: [PSES] Reading or Limit Conversion? >> >> >> >> >> >> A number of standards list radiated emission limits in the frequency range of >> 30-1000 MHz for test distance greater than 3 or 10 meters. >> >> Testing is normally performed at either 3 meters or 10 meters on an Open Area >> Test Site. >> >> A question has arisen concerning reporting the test results in these cases. >> >> Any opinions concerning which should be converted: >> >> a. Convert the limit to the relevant test distance (3 meters or 10 >> meters) by adding correction factor or >> >> b. Convert the reading to the unit and test distance listed in the >> standard (convert dBµV to µV and add correction factor for distance) >> >> On some occasions I have seen option b. above used. >> >> Which option is preferable? >> >> All opinions welcome >> >> >> >> Regards, >> >> David Shidlowsky | Technical Reviewer >> >> Address 1 Bat-Sheva St. LOD 7120101 Israel >> >> Tel 972-8-9186113 Fax 972-8-9153101 >> >> Mail : [email protected] <mailto:[email protected]> /[email protected] >> <mailto:[email protected]> /[email protected] Web www.itlglobal.org >> <http://www.itlglobal.org/> >> >> >> >> ITL Waze: https://waze.com/ul/hsv8vccn2j <https://waze.com/ul/hsv8vccn2j> >> >> >> >> Fill out Customer Satisfaction Survey >> <http://app.sqm.co.il/SitePages/Questionnaire.aspx> >> >> Global Certifications You Can Trust >> >> This e-mail message may contain privileged or confidential information. >> >> If you are not the intended recipient, you may not disclose, use, >> disseminate, distribute, copy or rely upon this message or attachment in any >> way. If you received this e-mail message in error, please return by >> forwarding the message and its attachments to the sender. >> >> >> >> >> >> - >> ---------------------------------------------------------------- >> >> 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 >> <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/ >> <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) <http://www.ieee-pses.org/list.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.ieee-pses.org/emc-pstc.html >> <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/ >> <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) <http://www.ieee-pses.org/list.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.ieee-pses.org/emc-pstc.html > <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/ > <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) <http://www.ieee-pses.org/list.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.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) <http://www.ieee-pses.org/list.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.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) <http://www.ieee-pses.org/list.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.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]>
