[PSES] Intensity of ESD for skin and hand-metal discharges

[Doug Smith]

Hi All, I have just posted my April 2013 Technical Tidbit: Technical Tidbit - March 2013 Human Metal vs. Human Body ESD (Metal in a human hand significantly increases ESD intensity) Abstract: The intensity of an ESD event from a human hand is affected strongly by the presence of metal held in the hand. System level standards like IEC 61000-4-2 usually model a human ESD event from metal held in the hand. Data is presented to show that a discharge directly from human skin is much less intense than a discharge through intervening metal held in the hand. There is a ratio of 40:1 or greater in the voltage induced in nearby circuitry by these two types of ESD events! The link to the article is; http://www.emcesd.com/tt2013/tt042013.htm On a more personal note, check out one of my non-technical adventures, the Devil Dash, a footrace combined with an obstacle course (barbed wire, mud,  rough terrain, etc.). Click here to see an interesting twist to the story. The event took place in Bootleg Canyon, here in Boulder City, NV March 23, 2013, on a much colder than normal day. I finished faster than 90% those entered, who on average were less than half my age! Doug -- -------------------------------------------------------------- ___ _ Doug Smith \ / ) P.O. Box 60941 ========= Boulder City, NV 89006-0941 _ / \ / \ _ TEL/FAX: 702-570-6108/570-6013 / /\ \ ] / /\ \ Mobile: 408-858-4528 | q-----( ) | o | Email: d...@dsmith.org \ _ / ] \ _ / Web: http://www.dsmith.org -------------------------------------------------------------- - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>