Greetings,
> Need it to be the exact size of 1.6 m x 0.8 m? Technically, yes. If you change the dimensions of the HCP you are deviating >from the standard and cannot claim that you performed the testing according to 61000-4-2. >61000-4-2 seems critical for the size of HCP: >From what I can understand of the theory, the coupling method of HCP indirect discharges to the EUT is more of a radiated phenomenon. As a result, the wave-shape of the disturbance would be dependent on the physical setup of the transmission system. The transmission system in this case includes the HCP and GRP. Changing dimensions of the HCP or distance between the HCP and GRP would change the transmission system. There has been work to show that even the relationship of where the ESD discharge is performed on the table edge in relation to the location of the connection of the HCP to the GRP has an effect (reference the first article below). Here are some articles available at IEEE that may be interesting: Transient near-field effect of electrostatic discharge Zhiyong Yuan; Jinliang He; Rong Zeng; Bo Zhang; Weiyuan Chen; Shuiming Chen; <http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20> Magnetics, IEEE Transactions on Volume 42, <http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=33780> Issue 4, April 2006 Page(s):795 - 798 Digital Object Identifier 10.1109/TMAG.2006.871451 Generation of ESD wave pulse and its space propagation characteristics Honda, M.; <http://ieeexplore.ieee.org/xpl/RecentCon.jsp?punumber=726> Industry Applications Society Annual Meeting, 1988., Conference Record of the 1988 IEEE 2-7 Oct. 1988 Page(s):1601 - 1606 vol.2 Digital Object Identifier 10.1109/IAS.1988.25271 Characteristics of E-field near indirect ESD events Iwata, H.; Akao, Y.; <http://ieeexplore.ieee.org/xpl/RecentCon.jsp?punumber=3346> Electromagnetic Compatibility, 1993. Symposium Record. 1993 IEEE International Symposium on 9-13 Aug. 1993 Page(s):26 - 27 Digital Object Identifier 10.1109/ISEMC.1993.473787 Happy Monday, Alvin Disclaimer: The contents reflect the opinion of the author and are meant for entertainment purposes only. _____ From: [email protected] [mailto:[email protected]] On Behalf Of Grace Lin Sent: Monday, October 15, 2007 9:55 AM 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 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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