Hey! We never discharged the EUT after the event. Rev Dr E
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Conway, Patrick R (Houston) Sent: Thursday, June 22, 2006 3:47 PM To: Sudhakar Wasnik; John Woodgate; emc-p...@ieee.org Subject: RE: [JunkMail] 1500 ohms 100 pF gun? Ah, ha. Glad to find another engineer who thinks like I do - unconventional! anecdote- One time I visited a large, well respected IT company who was having an ESD problem with a new product. They could not release to production because they could not pass the ESD test. I made one change to their test procedure and they were able to pass. Nothing spectacular really, just a little applied unconventional thinking! I observed that their test engineer was doing the test and then discharging the EUT after each strike (battery operated EUT). The EUT passed each and every strike, but had an upset during his connection of the discharge wire. The discharge wire had no resistors in line. It was a straight dump to the horizontal coupling plane. I explained to the team, showed them the failures were only during post-test charge dump. I explained that the discharge event is uncontrolled. It could have more ore less rise time, more or less fall time, more or less peak amplitude. It is uncontrolled. If they wanted to test with that waveform- no problem. But it is not required for CE Mark (their target). Everyone was happy! Much rejoicing. Anyway- clear evidence that even the post-test discharge needs to be done correctly. And, evidence that more training is always a good thing! Best Regards, Patrick Conway, NCE. 281.514.2259 281.524.5473 (fax) p.con...@hp.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
