Thats true Mike - but the lab is verifying the performance to a standard. If the standard says no test - then no test. One can of course have a special test for the company..... Best Regards Charles Grasso Senior Compliance Engineer Echostar Communications Corp. Tel: 303-706-5467 Fax: 303-799-6222 Cell: 303-204-2974 Email: charles.gra...@echostar.com; <mailto:charles.gra...@echostar.com; > Email Alternate: chasgra...@ieee.org
From: Mike Cantwell [mailto:mcantw...@leapfroginet.com] Sent: Monday, June 23, 2003 3:39 PM To: Emc-Pstc Subject: RE: ESD - not applicable ? I think this raises the difference between what's really required BY LAW and what is good engineering practice, or QUALITY. Although I personally am always for high quality and therefore perform tests above and beyond whenever I can, there are numerous instances where this is not prudent. Quality versus Regulatory Requirement = You'd like to do it versus you have to do it I do believe that I've seen some blood spattered on this list by those who could not differentiate between these two. I certainly know that I'm missing a pint or two... If the standard doesn't say it, then it isn't so. The limits the limit. And my personal favorite: We won't get caught. Quality versus Regulatory Requirement... Engineers versus Lawyers. OK, I'll stop now. From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of richwo...@tycoint.com Sent: Monday, 23 June, 2003 2:05 PM To: emc-p...@majordomo.ieee.org Subject: RE: ESD - not applicable ? Clause 8.3.1 of EN 61000-4-2 says "The static electricity discharges shall be applied only to such points and surfaces of the EUT which are acessible to personnel during normal usage." And it also says "The application of discharges to any point of the equipment which is assessible only for maintenance purposes, excluding customer's maintenance, is not allowed unless different prescription is given in the dedicated product specification." So, unless the product or family spec says otherwise, no testing is required if a product is touched only during maintenance other than customer maintenance. Richard Woods Sensormatic Electronics Tyco International From: Pettit, Ghery [mailto:ghery.pet...@intel.com] Sent: Monday, June 23, 2003 2:59 PM To: am...@westin-emission.no; emc-p...@majordomo.ieee.org Subject: RE: ESD - not applicable ? Amund, CISPR 24 (and EN 55024) provides reasons to not perform various tests, but ESD doesn't have any of these "outs". I think you are entirely correct in wanting the test done. Like you, I have seen this to be one of the more applicable immunity tests (along with surge) and we test to higher levels, too. Did the lab explain how the equipment would be installed, if not touched by human hands? Ghery S. Pettit Intel Corporation From: am...@westin-emission.no [mailto:am...@westin-emission.no] Sent: Monday, June 23, 2003 11:29 AM To: emc-p...@majordomo.ieee.org Subject: ESD - not applicable ? ESD has always been in my view, one of the most applicable EMC tests . We tests all our products with higher levels than stated in the standards. Last week I visited a local test lab and they told me that " ..... you do not need to ESD test your new equipment because it will not be operated (no keys to press) by humans or not accessible for humans (installed minimum 2.5m above the floor level) .....". Well, I was a bit surprised, because you can easily climb up to it and during maintenance you may touch it. So, what's your interpretation for ESD and situation where it is not applicable? We'll carry out the ESD test anyway, because I have no intention to discuss this case with a number of world-wide certification bodies. 20 minutes testing and all parts are satisfied ....... if it pass ..... Best regards Amund Westin, Oslo / Norway
