I have to agree with Mr. Woodgate's comment, as far as numbers go - 150 Ohms means the wire is very close to a well-defined ground plane if the number represents a transmission line characteristic impedance. However, the IEC 1000-4-6 test set up does not represent the real world, because it requires a well-defined low impedance ground plane underneath the entire test set-up. In my opinion, the set-up ought to look precisely like the IEC 1000-4-3 set up (80 cm above ground), since the purpose of 1000-4-6 is to simulate the results of radiated field-to-wire coupling at frequencies too low to accurately simulate in a practical radiated set-up.
I am curious to hear what Mr. Woodgate and others think about this topic. ---------- >From: John Woodgate <[email protected]> >To: [email protected] >Subject: Re: common mode immunity coupling units >Date: Tue, Nov 5, 2002, 3:08 PM > > > I read in !emc-pstc that Ken Javor <[email protected]> wrote > (in <[email protected]>) about 'common mode immunity > coupling units' on Tue, 5 Nov 2002: >>Because the Europeans think that is the right impedance to simulate a >>generic transmission line/antenna far from ground. > > Not 'far' from ground, AIUI, but 'not far' from ground. > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > Interested in professional sound reinforcement and distribution? Then go to > http://www.isce.org.uk > PLEASE do NOT copy news posts to me by E-MAIL! > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
