I just want to point out that there is a difference between the horizontal coupling plane and the ground reference plane. For a floor standing product, there is no horizontal coupling plane, the EUT rests on top of the ground reference plane the requisite distance, and only the vertical coupling plane is used for indirect discharges. For table top, the HCP is also used for indirect discharges. Both coupling planes are isolated from the ground reference plane except through the bleeder resistors. The ground reference plane, not the horizontal coupling plane, can be as large as necessary to extend at least 0.5m beyond the periphery of the EUT. I've never really thought of it, but I suppose for table top EUTs larger than the alternate test setup (two 1.6 x 0.8 HCPs) there would seem to be some precedence for "painting" the bottom of the EUT with the HCPs positioned in different locations. This is the method used for the smaller VCP when testing large EUTs. Bob R.
"Kunde, Brian" <[email protected]> wrote: We are in the same boat as you. Our products will not fit on a 1.6x.8 table, not even two tables. So we use the other setup configuration called out in the standard; for floor mounted equipment. Setup and test your product as if it was floor mounted. The HCP can be as large as needed and who's to say that is can't be on top of a table? Just make sure it is grounded well. Set your EUT on 100mm insulating platform just like you would for Conducted Immunity. I understand this setup is under consideration for the IEC 61000-4-2 standard anyway. Just document your setup in your test report. Comments for or against? The Other Brian. _____ From: [email protected] [mailto:[email protected]] On Behalf Of Grace Lin Sent: Monday, October 15, 2007 12:55 PM To: [email protected] Subject: Size of HCP per ESD Dear members, Could you please share your experience/comments in regard to the 1.6 m x 0.8 m size of horizonal coupling plane (HCP) per 61000-4-2? Need it to be the exact size of 1.6 m x 0.8 m? I would like to have a working bench works for both 61000-4-2 ESD and 61000-4-4 EFT/Burst tests. With the size of 1.6 m x 0.8 m, I may have a difficulty to place a generator, a capacitive coupling plane, and an EUT on the table. It would be great if I have 4' x 8' ground reference plane on top of the table. However, 61000-4-2 seems critical for the size of HCP: "If the EUT is too large to be located 0.1m minimum from all sides of the HCP, an additional, identical HCP shall be used, placed 0.3 m from the first, with the short sides adjacent." The 61000-4-2 standard doesn't give me a choice to enlarge the HCP. Thank you and look forward to hearing from you. Best regards, Grace Lin Sr. Compliance Engineer Crestron Electronics, Inc. New Jersey, USA www.crestron.com <http://www.crestron.com/> - ---------------------------------------------------------------- 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 _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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 e-mail has been scanned by MCI Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on MCI's Managed Email Content Service, visit http://www.mci.com. ______________________________________________________________________
