Correction to details for RMCEMCS May 18 Symposium
Hello: One minor correction. The cut off date for registration is May 12th in order to be eligible for the FREE continental breakfast and lunch. Please see our website at http://www.ewh.ieee.org/r5/denver/rockymountainemc - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Colorado Product Safety Technical Committee meeting notice for M ay 5, 1999
For those who are interested in the Colorado Product Safety Technical Committee (CPSTC) meeting, please read on. + The Colorado Product Safety Technical Committee (CPSTC) will be holding the May 5, 1999 meeting at the Jackson's All American restaurant, located in the city of Thornton, Colorado. It is being hosted by Kent Shown and Richard Georgerian, both are Product Compliance Engineers at Exabyte. As a courtesy to the restaurant, I would like to give them a head. If plan to attend and have dinner, please e-mail, phone or fax me no later than Tuesday, May 4, 1999. The specifics are as follows: List-Post: emc-pstc@listserv.ieee.org Date: Wednesday, May 5, 1999 Time: 6:30pm Location: Jackson's All American restaurant 1 Grant Thornton, CO 80234 If a map is needed, let me know when you advise me of your attendance. Agenda: 1) Planning for the 1999 year 2) Reminder - meetings will be held every other month on the first Wed. 3) Topic of discussion: Continuation of our last meeting in March, regarding developing our own workshop presentations. However, our main speaker for the evening will be Ron Duffy, safety engineer from the HP facilities in Colorado Springs. Ron Duffy will be practicing, his two topics that he will be presenting at the local Rocky Mountain Chapter EMC symposium. His safety presentation is part of the RMCEMC one-day symposium that is being held on May 18, 1999. Ron's workshop Titles: "Hipotting, How and Why" "High Current Ground Testing - Is It Worth It?" It would be helpful for Ron to get some feedback, so I hope to see many of you at the meeting. Otherwise, see Ron at the symposium. For more information, the RMCEMC Web Site is: http://www.ewh.ieee.org/r5/denver/rockymountainemc/ If any of our members would rather send in their ideas for this May 1999 meeting via the NET, in lieu of attending, please do so. Hope to see you all here! Richard Georgerian, Chairman of the CPSTC Product Compliance Engineer Exabyte 1777 Expedition Drive Boulder, CO 80301 USA tel.: 303-417-7537 fax: 303-417-5710 e-mail: richa...@exabyte.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Reverberating chambers and screen rooms
Mat: Every shielded enclosure starts out as a reverberant chamber. You then pay big bucks to coat those reflective surfaces with foam or ferrite treatments that reduce the reflections. But you want to shift the three-dimensional peaks and nulls around the volume of the chamber. To do this, you have to vary the reflective pattern within the room. The easiest way is to get about 3 surplus gearmotors (each with different RPM). Mount the gearmotors on the floor or ceiling or a wall of the room. Each gearmotor turns a reflective "paddle". As the paddles rotate, the pattern shifts about the room. I did a room (12' high by 36' long by 24' wide) where I used one 4'x 8' (firring strips with aluminum foil) paddle turning about 6 RPM, one 12" x 18" (sheet aluminum) paddle turning about 40 RPM, and one 12" x 18" (sheet aluminum with the corners bent at odd angles) turning about 60 RPM. During immunity testing, I was able to see peak-to-null ratios of about 40 dB in the field strength above 1 GHz. The big problems with the reverberant testing method is time and frequency. You really should wait a few minutes at each test frequency to be sure that all rotational combinations have been cycled through. This really slows a frequency sweep. You usually have to reach some compromise between sweep speed and certainty of peak detection. And, the technique becomes less capable as frequency drops. In practical size enclosures, I don't think you will get much effect below maybe 200 MHz. For emission testing, I still have some problem grasping the concept of how you relate observed emissions to a specific antenna-to-EUT separation distance. Regards, Ed From: "Aschenberg, Mat" Subject: Reverberating chambers and screen rooms Date: Fri, 30 Apr 1999 14:36:50 -0600 To: 'emc-pstc' > I was wondering how feasible it is to convert a screen room into a > reverberating chamber? > How useful are reverberating chambers in measuring radiated emissions? > Mat > > Mathew Aschenberg > > > - > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > ---End of Original Message- -- Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 List-Post: emc-pstc@listserv.ieee.org Date: 04/30/1999 Time: 16:13:37 Military & Avionics EMC Services Our Specialty Also Environmental / Metrology / Reliability -- - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: where to buy EMC standards
If you have web-access, the FCC regulations (CFR 47) can be downloaded (free) from both the FCC website WWW.FCC.GOV and the US Government Printing Office website WWW.GPO.GOV. Some ANSI standards (but not C63.4) can be downloaded (if you pay for them!) from WWW.ANSI.ORG Some ISO and other standards can also be purchased & downloaded from ANSI. You can download a catalog for $10. Many IEC standards can be downloaded (for a charge) from WWW.IEC.CH - see below. The CENELEC website WWW.CENELEC.BE lists titles, status and (very useful!) _scope_ of EN standards. But as far as I know, there is no source for downloading EN standards. For hard-copies, the IEC website (www.iec.ch) lists "National Committees and other Sales Outlets" for most countries. For Singapore, it lists: Singapore Productivity and Standards Board (PSB) 1 Science Park Drive SG-118221 SINGAPORE TP: +65 279 39 20 TF: +65 377 06 69 E-Mail: sa...@psb.gov.sg URL: http://www.psb.gov.sg You should be able to buy some or all ISO, IEC (& CISPR?) standards from the PSB. I think you can also visit their office to read copies of the standards. The IEC standards (now numbered IEC 61000-x-x), and CISPR 22, can also be bought directly from IEC Web Store (www.iec.ch). Many IEC standards, including most EMC stds, are available as electronic files for immediate download (charged to any major credit card). You can also order a hardcopy to be mailed to you if you prefer. Either way, the price is quoted in Swiss Francs, check with your bank or a major newpaper for the current exchange rate. You will get an email confirmation of your irder, plus a hardcopy receipt will be airmailed to you from Switzerland. Last time I used this, I had the standard on my computer within 2 minutes, and I printed a hardcopy for myself. The receipt arrived by airmail 5 days later (Switzerland to USA). EXTRACT from www.iec.ch: . "Buy any of IEC's 4500 (mostly bilingual English/French) publications from the IEC Web Store in electronic (PDF) and/or hard-copy versions. Some 1000 publications are also available in Spanish. Language versions are marked in the Search results. Electronic versions (where available) can be downloaded immediately or within 5 days of placing the order for use on single-user workstations only. Hard-copy versions (all publications) will be delivered to your shipping address. Some 1000 IEC publications are now available in Spanish." PS: You didn't say which countries in Europe, but if you meant the EU or EEA, I believe officially you should be declaring compliance to the EU- harmonized versions of the standards, e.g. EN 61000-x-y etc., not to the IEC editions. However, I think that the EN 61000-series is identical in technical content (word for word) with the IEC versions? You can buy the paper editions of the "EN" standards from many sources, in several languages. The English editions can be bought from BSI (United Kingdom), ANSI (USA) and also from several commercial distributors, including Global Engineering Documents here in USA (see earlier replies). I don't know if you can yet buy "electronic" editions of any EN standards. -regards, Glyn R Garside Adept Technology, Inc. (San Jose, California, USA.) ___ Subject: where to buy EMC standards From:Qu Pingyu at Internet-Mail List-Post: emc-pstc@listserv.ieee.org Date:1999-04-30 09:31 Hello, everyone: We would like to buy the following EMC standards (US and Europe): 1. CISPR 22 2. IEC - 1000 - 1,2,3,4 3. FCC CFR 47, Vol.1 4. ANSI C63.4 I suppose that these are the most frequently-used standards in EMC testing. (Do I miss anything ?). I would appreciate if anybody could tell me where I can buy these standards. Regards Qu Pingyu - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
