John. I think I answered this globally so I'll just do it locally for the moment. My humidity was a little on the low side, about 28% and theirs was closer to 38% or so. I would anticipate that might results would be the most harsh, but I am watching that as well. I was working in a Japanese factory on a design many years ago. The factors have no air conditioning of any type, and in the summer they have the windows open. I could absolutely tell when a storm unleashed rain, the humidity shot up and my ESD results got better.
Gary -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: Thursday, March 07, 2013 1:34 PM To: [email protected] Subject: Re: [PSES] test setup for table top ungrounded equipment 61000-4-2 IEC:2008 figure 6 page 20 In message <71901.38802.1362686781399.JavaMail.root@vznit170134>, dated Thu, 7 Mar 2013, [email protected] writes: >How does the humidity compare between sites and times when products >were tested? Any coorelation to pass vs. fail? A recent related (I think) incident. A neighbour brought me a display that was stuck in HDMI mode. None of the touch controls worked. But everything worked four hours later. I concluded that, even though the display had been in a heated house all the time, there had been condensation internally when it was moved from one room to another. So I think that VERY careful climatic control is necessary when doing ESD tests. -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- 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://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]> - ---------------------------------------------------------------- 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://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]>
