Hello Grace, I do not believe that there is a specific separation requirement between the EFT generator and the coupling clamp. I have a system from Keytek that came with a 0.5 m cable to connect the generator and the clamp. If anything, I find supplied cable to be too short for my needs. From what I know, the capacitive clamp should not cause interference with the EFT generator even if they are in close proximity.
The coupling clamp should not create significant radiated noise. In this I mean that the noise radiated by the clamp will be far less than that coupled into the EUT through the cable under test. There should not be a significant problem with the test if the EUT is less than 0.5 m from the clamp as long as you have the 0.5 m length of exposed cable that is specified. I will admit that I am not an expert in EMC measurements. I have been working with susceptibility testing for about eight years, but it only a fraction of the work that I perform. I am posting my opinion (and it is only an opinion) because I have not yet seen a response to your inquiry. I would like to encourage the more experienced EMC professionals to let me know if my though process is sound on this issue. If I am wrong, let me know; I am eager to learn more about the rationale behind the test procedure. Ted Eckert American Power Conversion/MGE http://www.apc.com/ The items contained in this e-mail reflect the personal opinions of the writer and are only provided for the assistance of the reader. The writer is not speaking in an official capacity for APC-MGE or Schneider Electric. The speaker does not represent APC-MGE's or Schneider Electric's official position on any matter. "Grace Lin" <gracelinnj@gmail .com> To Sent by: [email protected] [email protected] cc Subject 10/29/2007 02:24 EFT Setup PM Dear Members, I have two questions and appreciate your inputs: 1. Is there any clearance distance/requirement between an EFT generator and a capacitive coupling clamp (ccc)? 2. Is there any clearance distance/requirement between EUT and a capacitive coupling clamp (CCC)? From Figure 1 of IEC 61000-4-4, the cable length between the capacitive coupling clamp and the EUT "should be 0.5m +/- 0.05 m". Does this mean the distance between EUT and CCC should also be 0.5m? We built a 4ft x 8ft table with the same size of metal sheet (reference to ground reference) on top of it. I would like to place an EFT generator, CCC, and EUT on top of the table. Thank you for your time and look forward to your help. Best regards, Grace Lin - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
