Try Combinova of Sweden. They make the impedance boxes. Their Web sit is www.combinova.se. Ergonomics Inc. is the North American representative for them. The address is above. The way Sc77A made the standard.makes it difficult to make the measurements unless you are willing to scrap your old AC sources. It is not so easy to just add an impedance box. One has to consider the impedance of the AC source and the external impedances together to get the correct impedance. Otherwise the unit under test has to meet the requirements with a significantly higher impedance. There is another way to solve the problem. Combinova makes an AC source the has programmable output impedances so the dissipation problem is minimized and the EUT is at the correct impedance. Dave George, PE [email protected].
----- Original Message ----- From: John Lach <mailto:[email protected]> To: emc-pstc <mailto:[email protected]> ; John <mailto:[email protected]> Woodgate Sent: Monday, January 27, 2003 2:44 PM Subject: RE: High-currrent resistors and inductors - preferably variable RE: High-currrent resistors and inductors 1/27/03 Here is a possible source of High Power resistors in Europe. http://www.heine-widerstand.de/english/wider1.htm John John Woodgate wrote: > >One of my IEC colleagues, from a very large company, sent this enquiry: > >I am interested in locating >suppliers that can provide variable impedance elements (Ztest < Zref) >needed to test to EN 61000-3-11. The range of Ztest, at 50 Hz, may have >to be Ztest = (0.10 - 0.25) + j(0.10 - 0.25) with 75 A per phase. >I have located one supplier in the US, with a possible additional one >that may be acceptable. >I would like to have a European source if possible. Any information that >you can provided in this regard will be greatly appreciated. > >Either send me e-mail or put a message here. >My e-mail is jmw(AT)jmwa.demon.co.[DELETE.]uk >-- >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" John Lach Manager Standards and Test [email protected] Carling Technologies 60 Johnson Ave. Plainville, CT 06062 860-793-7167 www.carlingtech.com
