Re: High-currrent resistors and inductors - preferably variable
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 david.geo...@ergonomicsusa.com. - Original Message - From: John Lach mailto:john.l...@carlingtech.com To: emc-pstc mailto:emc-p...@majordomo.ieee.org ; John mailto:j...@jmwa.demon.co.uk Woodgate Sent: Monday, January 27, 2003 2:44 PM Subject: RE: High-currrent resistors and inductors - preferably variable RE: High-currrent resistors and inductors1/27/03 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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 john.l...@carlingtech.com Carling Technologies 60 Johnson Ave. Plainville, CT 06062 860-793-7167 www.carlingtech.com
RE: High-currrent resistors and inductors - preferably variable
RE: High-currrent resistors and inductors1/27/03 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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 john.l...@carlingtech.com Carling Technologies 60 Johnson Ave. Plainville, CT 06062 860-793-7167 www.carlingtech.com
Re: High-currrent resistors and inductors - preferably variable
Re: High-currrent resistors and inductors1/27/03 What we have found to work well is a combination of a resistor bank of open helical resistors which we purchase from Post Glover (www.postglover.com). Typically the total resistance is approximately 30 ohms which can be tapped off in 1 ohm steps to form various series parallel combinations. We then have air core inductors custom wound with multiple taps to allow for adjustment of the power factor. I would expect that most transformer companies can wind this type of inductor for you. If you have any further questions feel free to contact me at my email address below. John Lou Aiken wrote: This sounds like something that won't be found on the shelf. I have seen some small AC welding machines where the output current was adjustable by increasing and decreasing an adjustable air gap designed into the magnetic path of the flux cutting the output winding. The flux path in the primary remains unchanged. They make a H of a noise under load. I have not the slightest idea how much the scheme would or could change the phase angle but of course it did. So, I would ask manufactures of small AC welding machines if they would be willing to eliminate the input circuit and furnish such a regulating component.. Lou Aiken, LaMer LLC 27109 Palmetto Drive Orange Beach, AL 36561 USA tel ++ 1 251 981 6786 fax ++ 1 251 981 3054 Cell ++ 1 251 979 4648 - Original Message - From: John Woodgate j...@jmwa.demon.co.uk To: emc-p...@majordomo.ieee.org Sent: Monday, January 27, 2003 7:56 AM Subject: High-currrent resistors and inductors - preferably variable 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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 john.l...@carlingtech.com Carling Technologies 60 Johnson Ave. Plainville, CT 06062 860-793-7167 www.carlingtech.com
Re: High-currrent resistors and inductors - preferably variable
This sounds like something that won't be found on the shelf. I have seen some small AC welding machines where the output current was adjustable by increasing and decreasing an adjustable air gap designed into the magnetic path of the flux cutting the output winding. The flux path in the primary remains unchanged. They make a H of a noise under load. I have not the slightest idea how much the scheme would or could change the phase angle but of course it did. So, I would ask manufactures of small AC welding machines if they would be willing to eliminate the input circuit and furnish such a regulating component.. Lou Aiken, LaMer LLC 27109 Palmetto Drive Orange Beach, AL 36561 USA tel ++ 1 251 981 6786 fax ++ 1 251 981 3054 Cell ++ 1 251 979 4648 From: John Woodgate j...@jmwa.demon.co.uk To: emc-p...@majordomo.ieee.org Sent: Monday, January 27, 2003 7:56 AM Subject: High-currrent resistors and inductors - preferably variable 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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
High-currrent resistors and inductors - preferably variable
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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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
