Acceleration factor.
A colleague of mine has asked the following question about acceleration factors. I know it doesn't fit this forum but with all the great knowledge found here I expect someone may be able to provide a lead if not an answer. Question: Do you know where I can find a qualitative acceleration factor for the combination of testing and humidity highly accelerated testing for DI water-generated humidity on exposed copper traces of PC boards, similar to the Arhenius equation for acceleration of failure versus temperature. ? Please reply directly to : paul.d.ander...@scismail.sci.com or to the writer. Thank you Leo Heiland
EU 12-month "administrative tolerance"
Just read an article from the 4 April 1996 issue of the (London?) Financial Times that quotes a Dave Imeson, identified as EMC manager of IBM UK services, as saying that there has been an agreement among the EU member states to have a 12-month period of "administrative tolerance" re the EMC directive. Anybody know what Dave might be referring to? Mike Sherman Product Safety Engineer FSI International m_sher...@delphi.com
FCC 47 CFR & Indust Equip
We're a manufacturer of industrial equipment. The equipment goes into what the European EMC directive would classify as a heavy industrial environment. We use a lot of electronics--PCs, PLCs, sensors, etc--in our controls that are built into this equipment. Question: do we have to comply with the FCC regs, Title 47 CFR 15, subpart A (b), as an unintentional radiator? thanks! Mike Sherman Product Safety Engineer FSI International (612) 361-8140 m_sher...@delphi.com
US-EU MRA update
You are invited to: OVERVIEW OF THE US-EU MRA NEGOTIATIONS FOR TELECOMMUNICATIONS presentation by Art Wall, FCC organized by IEEE EMC Society, Central New England Council on Wednesday, May 21, 1996, 6:30 p.m. at Parker Chomerics Facility, 77 Dragon Court, Woburn, Massachusetts. At the request of the U.S. Department of Commerce and the Office of the United States Trade Representative, the FCC has been participating in negotiations to develop a Mutual Recognition Agreement for conformity assessment between the United States of America and the European Union. These talks were initiated at the request of certain U.S. industry groups, e.g. Telecommunication Industry Association and Information Technology Industry Council, to allow U.S. manufacturers the opportunity to test and approve in the United States products going to Europe. Under the terms of such an MRA, the Europeans would have the same opportunities to test and approve covered equipment for the U.S. market. This presentation will provide a brief overview of the EU new approach directives, the Telephone Terminal Equipment (TTE) and Electromagnetic Compatibility (EMC) Directives and a discussion of the negotiations with EU to date. Art Wall is Chief of the Customer Service Branch of the Office of Engineering and Technology of the Federal Communications Commission of the United States of America, where, among other things, he is responsible for overseeing programs for developing consistent interpretations of the FCC Rules for radio frequency devices, for developing valid and repeatable measurement procedures and for the FCC listing program for test sites capable of measuring such devices. As the FCC representative to American National Standards Committee on EMC, C63, he was partly responsible for the adoption and use of ANSI standard C63.4 by the FCC. Recently, he was elected Chairman of IEC/CISP Subcommittee A, which is an international standards organization dealing with EMC measurements. Over the last two years, he has been a member of the U.S. negotiating team for developing a Mutual Recognition Agreement with the European Union for conformity assessment of equipment subject to the TTE and EMC Directives. Mr. Wall is a Fellow of the IEEE. He has a Bachelors and Masters of Science degrees in Electrical Engineering from the University of Maryland and George Washington University, respectively. The May 21st meeting of the IEEE Electromagnetic Compatibility Society, New England Chapter will be held in the cafeteria of the Parker Chomerics Facility, 77 Dragon Court, Woburn, Massachusetts. Enter Chomerics via Dragon Court, The cafeteria is located on the ground floor of the building across from building 78. A no-host dinner with the speaker will follow the meeting. For more information call John F. Luchini, (617) 847-1544. Directions: From Route 128 take exit # 36 Washington Street. Proceed North after the traffic light (Bradlees on the right), past the US Post Office on the left. Dragon Court is on the left, just before the gas station. Proceed about 1 mile to the Parker Chomerics facility which is on the left. Mirko Matejic email: mmate...@foxboro.com The Foxboro Company tel:(508) 549-3185
Re: FCC Website Information
As to item 2 on the part 68 leakage test: It is a highpot type test. The idea is to see if hazardous currents from the AC power mains can reach the telco interface. The isolation is tested in two places: Once by placing 1000VAC between Tip/Ring and a long list of other parts of the product (which in most cases can be simplifed to logic ground). Second by placing 1500VAC between the AC mains inlet and a somewhat shorter list of parts of the product (also generally simplified to logic ground). In each case no more than 10mA of current can flow. The voltage is ramped to peak over 30 seconds and then maintained for another 60 seconds. Note that intentional paths to ground such as MOVs and spark gaps are removed for the test. If you have more questions or desire greater detail please feel free to call. Jon D. Curtis, P.E. Director of Engineering email: j...@world.std.com Curtis-Straus LLCphone: (508) 263-1897 409 Massachusetts Avenue fax:(508) 263-4164 Acton, MA 01720 http://world.std.com/~jdc/ USA On Wed, 24 Apr 1996, Larry Merchell wrote: > > 1. For Everyones Information, > > CFR's can be downloaded from (via Netscape): > > Federal Communication Commission > Office of Engineering and Technology > FCC Rules and Regulations > > located at: > http://www.fcc.gov/oet/info/rules/ > > 2. I am looking for information regarding 47 CFR 68.304 "Leakage current > limitations". The standard states that the leakage current must be less > that 10mA at 1500VAC from AC line to case [ (b) to (c) ], which looks like a > Hipot test not a leakage test. Does anyone have any additional information > regarding this? > > > Thank you for any help. > > Larry Merchell > Product Safety Engineer > Xentek Power Systems > > lar...@electriciti.com >
FCC Website Information
1. For Everyones Information, CFR's can be downloaded from (via Netscape): Federal Communication Commission Office of Engineering and Technology FCC Rules and Regulations located at: http://www.fcc.gov/oet/info/rules/ 2. I am looking for information regarding 47 CFR 68.304 "Leakage current limitations". The standard states that the leakage current must be less that 10mA at 1500VAC from AC line to case [ (b) to (c) ], which looks like a Hipot test not a leakage test. Does anyone have any additional information regarding this? Thank you for any help. Larry Merchell Product Safety Engineer Xentek Power Systems lar...@electriciti.com
EMC CAPACITORS
Hi! My co-worker and I are having a bit of a problem finding "X" and "Y" caps for use with a 480VAC DELTA system. The highest voltage capacitors (that have Norh America and European approvals) are 400V. Any advice The power suppy these caps are used in must comply with EN60950, IEC950 and UL1950. Gabriel Pietromonaco Lucent Technologies (formerly AT&T)
