EU TTE Safety Standards
Good Day All: I am trying to determine the appropriate safety standards to use for a piece of Test and Measuring Equipment which is intended to be connected as terminal equipment to the public telephone network. In particular I would like to know: What standards have been published in the EU's Official Journal as acceptable for showing compliance with the TTE Directive ? Or perhaps someone would know what issue of the journal that was in and I could try to reference that ? I have been looking at EN60950 clause 6 and EN41003, but there seem to be a lot of NET's, CTR's and ETSI standards involved in this arena and I am unsure how involved I need to be with them from the safety end of the picture. Any advice would be very much appreciated. Richard Payne Tektronix, Inc. (503) 627-1820 richard.pa...@tek.com
Harmonic current measurement and input power
I have a system that consists of a line-connected 120W switching power supply in parallel with a line-connected 450W resistive heater. The switching supply is not 'harmonic corrected', and does does meet the requirements of IEC1000-3-2. The load on the power supply is constant. The resistive load cycles either 100% on, or 100% off (no phase control is used), with 5 minute on 5 minute off periods. In order to apply the proper harmonic limits, I need to determine the proper test setup. - While the resistive load is cycled off, the input power is 120W, and the 3rd harmonic current must be less than 120W * 3.4mA/W = 0.41A, and the system fails. - While the resistive load is cycled on, the input power is 570W. The 3rd harmonic current must be less than 570W * 3.4mA/W = 1.94A. The system passes. Any suggestions? Thanks,
Job Announcements
AST Computer, Inc. in Irvine, CA currently has openings for a Sr. EMC Engineer and an EMC Technician. Anyone interested should send a resume or contact me for more information. John Nelson AST Computer, Inc. 16215 Alton Parkway Irvine, CA 92618 e-mail: john.nel...@ast.com Voice: (714) 727-8146 FAX: (714) 727-7595
LISN, Surge and Burst
I am trying to find a reliable calibrator for the equipment mentioned in the subject header. Can anyone recommend a few companies? Your help is appreciated. Sincerely, Frank Goto A-pex International Co., Inc.
Re: Prod. Safety requirements
Hello San, to get the most official response I sugget you call the Israeli Institute for Standards: Ala or Bernadet 972-3-6465045/6/7 good luck moshe valdman - Mesa Computers Consulting Services PS sorry I and probably others of my profession in Israel do not respond immediately with an answer: we do not deal very much with local regulations. __ Reply Separator _ Subject: Prod. Safety requirements Author: INTERNET:sandy_florence-esf...@email.mot.com at CSERVE List-Post: emc-pstc@listserv.ieee.org Date:24/01/97 07:48 PM Sender: owner-emc-p...@mail.ieee.org Received: from ruebert.ieee.org (ruebert.ieee.org [199.172.136.3]) by hil-img-2.compuserve.com (8.6.10/5.950515) id SAA29741; Fri, 24 Jan 1997 18:44:30 -0500 Received: (from daemon@localhost) by ruebert.ieee.org (8.7.5/8.7.3) id OAA25295 for emc-pstc-list; Fri, 24 Jan 1997 14:25:34 -0500 (EST) List-Post: emc-pstc@listserv.ieee.org Date: Fri, 24 Jan 1997 12:57:06 -0600 From: Sandy Florence-ESF003 sandy_florence-esf...@email.mot.com Message-Id: Macintosh */PRMD=MOT/ADMD=MOT/C=US/@MHS Subject: Prod. Safety requirements To: emc-p...@ieee.org (Receipt Notification Requested) X400-Mts-Identifier: [ /P=MOT/A=MOT/C=US/ ; m\il02s\970124125706f ] X-Mailer: Worldtalk (4.0.2-p15)/STREAM Sender: owner-emc-p...@majordomo.ieee.org Precedence: bulk Reply-To: Sandy Florence-ESF003 sandy_florence-esf...@email.mot.com X-Resent-To: Multiple Recipients emc-p...@majordomo.ieee.org X-Listname: emc-pstc X-List-Description: Product Safety Tech. Committee, EMC Society X-Info: Help requests to emc-pstc-requ...@majordomo.ieee.org X-Info: [Un]Subscribe requests to majord...@majordomo.ieee.org X-Moderator-Address: emc-pstc-appro...@majordomo.ieee.org Does any one know if any EMC or product safety requirements for Israel? San
re Patrick Lawler and linear load in parallel with switcher
In my personal experience looking at just the 3d harmonic is going to get you in trouble. Please take the time to look all the way out to the 39th and be prepared for some unpleasent news. You might be able to create an arguement that the current wave shape falls out of the 'special D' with sufficient parallel loading and be allowed to use Table 1. Then the 3d harmonic permitted is 2.3A. And don't forget JEIDA which requires testing at 100v and 50/60 Hz. Bob
Re: Job ads OK?
I agree with Mike. GMS I think job ads belong here, it's one of the things we want to share. But they should be VERY short (one screen max) and have a clear subject line, including state or region, to avoid wasting time and bandwidth. Personal opinion only, of course. -- From: Mike Morrow To: IEEE EMC Board; me...@aol.com Subject: Re: Product Safety Positions in NC List-Post: emc-pstc@listserv.ieee.org Date: Monday, January 27, 1997 5:45AM Anyone else tired of getting this message?? Subject: Product Safety Positions in
RE: LISN, Surge and Burst
Frank, Michael Howard provides good calibration service, traceable to NIST, with very competitive prices and 3-5 days turnaround time at: Liberty Labs, Inc. 1346 Yellowwood Rd. P.O. Box 230 Kimballton, IA 51543 Tel: (712) 773-2199, Fax: (712) 773-2299 Email: mhow...@netins.net Homepage: http://www.netins.net/showcase/liberty/ They calibrate antennas, LISNs, Surge and Burst coupling/decoupling networks, attenuators, and offer volume discount for qty of 2 and up. Mirko -- From: Frank F. Goto To: 'EMC-PSTC' Subject: LISN, Surge and Burst List-Post: emc-pstc@listserv.ieee.org Date: Monday, January 27, 1997 11:40PM I am trying to find a reliable calibrator for the equipment mentioned in the subject header. Can anyone recommend a few companies? Your help is appreciated. Sincerely, Frank Goto A-pex International Co., Inc.
Re: Harmonic current measurement and input power
Hi Rich. You dropped a p.s. which caught my cynical eye... ps: My personal opinion is that the mains is to serve us, the consumer. We don't have to correct for linear non-unity power factor loads, why do we have to correct for non-linear non-unity power factor loads? My understanding is that the Committee (s) which grew IEC1000.3.2 and 3.3. were comprised of, in the majority, representatives from the Power Generating Industry, and the poor old consumer didn't get a look in. Subsequently, the principle was set that any problems with the mains supply is the users, not the makers. Perhaps that is a gross over simplification, but that's how it seems to me. They never had these problems with steam, or coal, or water mills, or windmills. maybe we should go back. Chris Dupres EMC Specialist. VG Microtech. cdup...@vgmicrotech.com tel +44 (0) 1825 761077 fax +44 (0) 1825 768343 'Opinions expressed are personal, not necessarily Corporate'
