Brent – Correct me if I’m wrong but don’t the EU specs specifically exclude air discharges on conductive surfaces?
________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Brent G DeWitt Sent: Monday, May 18, 2009 6:58 PM To: [email protected] Cc: 'Bill Owsley'; [email protected] Subject: RE: [PSES] ESD testing I may have not phrased my reply correctly. I definitely would discharge to conductive surfaces, but I would do so with the contact discharge mode. The contact mode is more repeatable and has a faster rise time than air discharge. I only meant to say that after doing contact discharge evaluation of conductive surfaces, I wouldn’t also apply air discharge to the same points. Does that make more sense? Respectfully, Brent From: Fred Townsend [mailto:[email protected]] Sent: Monday, May 18, 2009 7:20 PM To: Brent DeWitt Cc: Bill Owsley; [email protected] Subject: Re: [PSES] ESD testing Brent: I would have to ask on what basis you would exclude conductive surfaces? My experience has been grounding defects were exposed by conductive discharge and as such it was a very valuable engineering tool. Fred Townsend Brent DeWitt wrote: Ian, I have always been of the opinion that it is not required to do air discharge to conductive surfaces. That said, my current employer has written internal standards to include air discharge to conductive surfaces. I'll be interested to see where this thread leads. Brent DeWitt -----Original Message----- From: Bill Owsley Sent: May 18, 2009 12:27 PM To: [email protected] Subject: Re: [PSES] ESD testing The fun part of air discharges to insulating surfaces is that things are not always what they appear to be. The air discharge can find a way around lots of apparent insulation to find the nearest conductor and insert all sorts of havoc in the system. - Bill Indecision may or may not be the problem. --- On Mon, 5/18/09, Gordon,Ian <[email protected]> <mailto:[email protected]> wrote: From: Gordon,Ian <[email protected]> <mailto:[email protected]> Subject: ESD testing To: "IEEE EMC & SAFETY PSTC" <[email protected]> <mailto:[email protected]> List-Post: [email protected] List-Post: [email protected] List-Post: [email protected] Date: Monday, May 18, 2009, 7:09 AM All Is it necessary to apply both air & contact discharges to equipment given the following?: Looking at 61000-4-2 I believe the critical part is the first paragraph of section 7 ".Test set-up". .....application of discharges to the EUT in the following manner: a) contact discharge to the conductive surfaces and coupling planes; b) air discharge at insulating surfaces. it does not say for air discharge at insulating AND conductive surfaces. The table in section. 8.3.1 is just for conductors but is essentially a restatement of the above. I cannot see any other part of the spec that implies the opposite. Ian Gordon --- --- --- --- --- --- --- --- --- --- --- --- --- The contents of this email and any attachments are confidential and are provided solely for the use of the intended recipient(s). If you are not the intended recipient, you are hereby notified that any copying, disclosure, distribution, or use of this e-mail, its attachments or any information contained therein is unauthorized and strictly prohibited and you should please contact the sender immediately and delete this e-mail and any attachments from your system. No responsibility is accepted for any virus or defect that might arise from opening this e-mail or attachments, whether or not it has been checked by anti-virus software. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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