BTW, indoor humidity is constant in Boulder City, NV as the dewpoint does not change much summer to winter. It is often 10 degrees F almost any time of year, and conventional air conditioning actually increases indoor relative humidity as they do not remove water (dewpoint too low) but cool the air. If you want to test ESD in the winter in Canada but do not want to brave the cold weather, you get the same conditions in Boulder City in June while wearing shorts and T-shirt.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: [email protected] Website: http://dsmith.org On Fri, Jan 5, 2018 at 18:21, Ken Javor <[email protected]> wrote: ESD question Just curiosity. Spent a week in the cold frozen north. Single Fahrenheit digits (above and below zero) outside, snow on the ground, 70 degrees inside – dry air. Was able to generate some pretty decent lightning simulations walking around and especially stripping a bed that had some sort of fuzzy (no doubt synthetic material) blanket. While stripping the bed, I was listening to a podcast on an iPhone, through wired earbuds. I could hear the discharges through the earbuds. That was some sort of interference, but not the question of interest here. What was interesting is that the bigger sparks not only zapped where I made contact (typically hands) but also from the earbuds to my inner ear (ouch)! That’s not what I said, but close enough. The iPhone was in a leather pouch suspended from by belt. The hook around the belt was metal, the belt was leather, and there were (denim cotton) pants between the hook on the inside of the belt and my skin. To my understanding, the iPhone and earbuds should have been at near or the same potential I was, and even if not, it was certainly no sort of ground – completely isolated from anything except me. So the question is why was there such a potential difference between iPhone and earbuds and me that my ears were zapped? Ken Javor Phone: (256) 650-5261 - ---------------------------------------------------------------- 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 < [email protected] [[email protected]] > All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html [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/ [http://product-compliance.oc.ieee.org/] can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ [http://www.ieee-pses.org/] Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) [http://www.ieee-pses.org/list.html] List rules: http://www.ieee-pses.org/listrules.html [http://www.ieee-pses.org/listrules.html] For help, send mail to the list administrators: Scott Douglas < [email protected] [[email protected]] > Mike Cantwell < [email protected] [[email protected]] > For policy questions, send mail to: Jim Bacher < [email protected] [[email protected]] > David Heald < [email protected] [[email protected]] > - ---------------------------------------------------------------- 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 <[email protected]> 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
