Doug, How significant are differences between the telephone/radar operators cases and Ken's experience? Equipment capacitances (higher pF for telephone/radar operators), discharge location and voltage (Ken's in-ear ear buds vs. "on/over ear" for operators), wire lengths and floating vs. earthed configurations? Both deal with energy transfer to/from cells that are likely more sensitive (electrically/neurally/perceptually) than the human hand. Sounds (pun intended) like an interesting neuroscience topic!
Maybe this could be an occasional benefit to not having a 3.5mm audio jack on a hand set. And this probably isn't a good idea for a new experiment at your workshops. ;-) Cheers, Adam in Atlanta On Sat, Jan 6, 2018 at 2:48 AM, Douglas Smith <d...@emcesd.com> wrote: > Thus is a common occurrence. The iPhone was not actually connected to you > so the large E field induced a different charge on you than on the phone > and hence the discharge through your ear (the lowest breakdown between the > iPhond and you. > > Such discharges have led to claims of injury that ended up in court. > Telephone operators and radar operators (such as in air traffic control) > experience this effect. The first case I was involved with was 20 years ago > and since have provided expertise to lawyers on legal cases involving this > effect. The discharge is not dangerous, but people have been convinced they > were nearly electrocuted and have been hauled off to the hospital on a > stretcher! > > Doug Smith > Sent from my iPhone > IPhone: 408-858-4528 <(408)%20858-4528> > Office: 702-570-6108 <(702)%20570-6108> > Email: d...@dsmith.org > Website: http://dsmith.org > > On Fri, Jan 5, 2018 at 18:21, Ken Javor <ken.ja...@emccompliance.com> > wrote: > > 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 < > 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://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 > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > > - > ---------------------------------------------------------------- > > 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://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 > > For help, send mail to the list administrators: > Scott Douglas <sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > - ---------------------------------------------------------------- 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://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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
