Ken, The test set up is over a ground plane with controlled impedances to make the test more reproducible. It is not perfect but it's better than having the EUT 80 cm above the ground plane where the impedances would be very high and harder to control.
Best regards, Jim -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Ken Javor Sent: Wednesday, November 06, 2002 10:54 PM To: John Woodgate; [email protected] Subject: Re: common mode immunity coupling units 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" ------------------------------------------- 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"
