RE: Precompliance Testing
Hi folks, The company mentioned, SARA, builds what they call a distributed RF analyzer named CASSPER. They have been working on it for a while now, demoed it at a couple of shows, and to the best of my knowledge the system started to ship recently. In the data sheets I analyzed, mention was made of background noise cancellation techniques by using two time and frequency synchronized receivers, one configured as the normal receiver and one as a reference receiver. The time and frequency sync between the two receivers allows for coherent simultaneous measurements of the reference signal and the measuring signal, hence allowing the system to dynamically reduce the noise level in the measurement. So far the data sheets... By the way, this noise cancellation technique will not work on ordinary receivers and spectrum analyzers because the time/frequency synchronization, which cannot be achieved with ordinary equipment, is essential. In theory this works great, but as with all noise/spurious signal cancellation techniques (common in the RCS and antenna measurement world) using a variety of mathematical principles, there will be practical limitations. Also, one of the drawbacks is that you are required to purchase another receiver for this technique to work. And of course this type of receiver with noise cancellation technique is not the kind of device the standards have made provisions for, so the question is if the data will ever be acceptable for compliance measurements per the standards. CASSPER is a very interesting device, very useful for a wide variety of RF applications. I would like to get my hands on one soon to tinker with it and find out exactly what its potential is. The company mentions as applications pre-compliance regulatory testing and EUT debugging, but as indicated it is not usable for compliance testing (yet?). Reference: http://www.sara.com/cassper Regards, -Robert Robert Bonsen Principal Consultant Orion Scientific email: rbon...@orionscientific.com URL: http://www.orionscientific.com phone: (512) 347 7393; FAX: (512) 328 9240 - 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).
FW: ETS 300 328
Senton GmbH is a test lab in Germany that is certified for ETS 300328 testing. Contact Johann Roidt at Senton GmbH EMI/EMC Test Center Aeussere Fruehlingsstrasse 45 D - 94315 Straubing Germany 49 - 9421/5522 13 j.ro...@senton.de Hope this helps. Don Umbdenstock Sensormatic -- From: DVVENTL Lizette de Vries-Vente[SMTP:dvve...@mail.sabs.co.za] Reply To: DVVENTL Lizette de Vries-Vente Sent: Thursday, May 06, 1999 10:47 AM To: emc-p...@ieee.org Subject:ETS 300 328 Hi Group I have a client who needs to have ETS 300 328 type approval testing done. It is some kind of tag that uses 2.4 or 5.8 GHz RX frequencies. The lab also needs to be accredited for this specification by the national accreditation body of the country. Can anybody make suggestions for European or US labs. Thanks, Lizette de Vries-Venter SENIOR ENGINEER Division of Electronics and Appliances SABS Tel : +27 12 428 6990 Fax : +27 12 428 6523 Email : dvve...@sabs.co.za - 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).
RE: Take my Shield Room, Please!
The shield room in question has been promised to Desmond Frasier of Rhein Tech Labs. Should Mr. Frasier decide not to take the shield room, I will contact those of you who also expressed interest in it. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Flinders, Randall Sent: Wednesday, May 05, 1999 4:57 PM To: 'emc-pstc' Subject:Take my Shield Room, Please! Greetings Compliance Professionals! We happen to have a shield room we recently dismantled available to anyone who wants to come pick the thing up. It is a single-walled, steel room with a standard size door. The measurements of the chamber are 8 feet high by 12 feet wide by 16 feet long. It is designed in such a way that it would need substantial modifications if you were to try and hang absorbers on the ceiling and/or walls. The manufacturer of the chamber is unknown. It is currently dismantled and stacked on a pallet in our shipping area. Anyone interested in acquiring the chamber should contact me at the phone number / e-mail shown below. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org application/ms-tnef
RE: Precompliance Testing
Sara will be demonstrating the Ambient Canceling System at the next Meeting of the Orange County Chapter of the IEEE EMC Society. The date of the meeting will be June 24th, and the meeting will be held at Emulex Corporation in Costa Mesa. Anyone interested in attending the demonstration should contact me at the phone number and/or e-mail shown below. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Gorodetsky, Vitaly Sent: Thursday, May 06, 1999 9:06 AM To: 'Aschenberg, Mat'; Gorodetsky, Vitaly; 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Cc: 'pparh...@sara.com' Subject:RE: Precompliance Testing It is simple and elegant patent pending solution (Cassper Div. of SARA has filed for patent). Contact Dr. Parviz Parhami of SARA : pparh...@sara.com -Original Message- From: Aschenberg, Mat [SMTP:matt.aschenb...@echostar.com] Sent: Thursday, May 06, 1999 8:31 AM To: 'Gorodetsky, Vitaly'; 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Subject: RE: Precompliance Testing What would that method be? Mat -Original Message- From: Gorodetsky, Vitaly [SMTP:vgorodet...@canoga.com] Sent: Wednesday, May 05, 1999 6:22 PM To: 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Subject:RE: Precompliance Testing In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -Original Message- From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com] Sent: Wednesday, May 05, 1999 12:23 PM To: 'Hans Mellberg'; 'emc-pstc' Subject:RE: Precompliance Testing I second that opinion. My experience shows SEVERE ambient issues with rooftop sites. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Hans Mellberg Sent: Wednesday, May 05, 1999 7:59 AM To: emc-p...@majordomo.ieee.org; bogda...@pacbell.net; Gary McInturff Cc: 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject:Re: Precompliance Testing Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription,
RE: Precompliance Testing
I discussed the idea of two channel configuration fiber-optic-based (critical trait: no additional rad. emissions) system with Dr. Parviz Parhami of Cassper Div. of SARA, Inc. I learned later that SARA has filed for a patent (it is patent pending). The original system was developed for some DoD applications. It is inexpensive and rather elegant solution considering availability of hardware from SARA. One of two antennas sould be positioned at, say, 10m (or 30m, as required) from an EUT and the second antenna is placed at the predetermined distance from the first, such that the emissions from the EUT would be relatively negligible. The rest, differential data processing, is obvious. There are some metrological issues to be resolved. For details, contact Dr. Parviz Parhami, e-mail: pparh...@sara.com. Best Regards -Original Message- From: ed.pr...@cubic.com [SMTP:ed.pr...@cubic.com] Sent: Thursday, May 06, 1999 10:00 AM To: Gorodetsky, Vitaly; 'emc-pstc' Subject: RE: Precompliance Testing Vitaly: Could you describe your ideas about inexpensive OATS automatic ambient cancellation? From: Gorodetsky, Vitaly vgorodet...@canoga.com Subject: RE: Precompliance Testing Date: Wed, 5 May 1999 17:22:12 -0700 To: 'Flinders, Randall' randall.flind...@emulex.com, 'Hans Mellberg' emcconsult...@yahoo.com, 'emc-pstc' emc-p...@majordomo.ieee.org In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -- Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 Date: 05/06/1999 Time: 08:59:57 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: Precompliance Testing
Vitaly: Could you describe your ideas about inexpensive OATS automatic ambient cancellation? From: Gorodetsky, Vitaly vgorodet...@canoga.com Subject: RE: Precompliance Testing Date: Wed, 5 May 1999 17:22:12 -0700 To: 'Flinders, Randall' randall.flind...@emulex.com, 'Hans Mellberg' emcconsult...@yahoo.com, 'emc-pstc' emc-p...@majordomo.ieee.org In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -- 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: 05/06/1999 Time: 08:59:57 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: EMC Books
Jon, I just visited your book store. Very pertinent comments on each book although brief. The first three books should be listed must read for EMC engineers. Suggestion for the book of Printed Circuit Board Design Techniques for EMC Compliance, Mark I. Montrose, 1996: The newest edition seems to be 1998? The new edition added much more materials on Signal Integrity. Barry - Original Text From: Jon D. Curtis j...@curtis-straus.com, on 5/6/99 8:02 AM: Hi Ron, I've posted reveiws of a number of EMC books at www.conformity.com/book_store.html Disclosure: I also sell the books there. ron_pick...@hypercom.com wrote: To all, I am interested in knowing (and maybe others are, too) about the really good EMC books that are out and about. They may be practical, theoretical or anywhere in between. Areas of interest are, but are not limited to PWBs, backplanes and systems with considerations for design, troubleshooting, and noise reduction. For those having such handy references up on their shelves or just knowing of any, please feel free to reply. Replies may be either posted on this forum or sent to me privately. Either way, I will post the summary of results once the responses die off. BTW, I already know about a few books and will include those in the summary. This list of EMC references will likely be a valuable asset to any EMC professional, particularly those new to the game. Who knows, maybe we all might benefit from such a list. OK, let me have it/them. Best regards, Ron Pickard ron_pick...@hypercom.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). -- Jon D. Curtis, PE Curtis-Straus LLC j...@curtis-straus.com Laboratory for EMC, Safety, NEBS, SEMI-S2 and Telecom 527 Great Roadvoice (978) 486-8880 Littleton, MA 01460 fax (978) 486-8828 http://www.curtis-straus.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). - 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: Precompliance Testing
It is simple and elegant patent pending solution (Cassper Div. of SARA has filed for patent). Contact Dr. Parviz Parhami of SARA : pparh...@sara.com -Original Message- From: Aschenberg, Mat [SMTP:matt.aschenb...@echostar.com] Sent: Thursday, May 06, 1999 8:31 AM To: 'Gorodetsky, Vitaly'; 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Subject: RE: Precompliance Testing What would that method be? Mat -Original Message- From: Gorodetsky, Vitaly [SMTP:vgorodet...@canoga.com] Sent: Wednesday, May 05, 1999 6:22 PM To: 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Subject:RE: Precompliance Testing In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -Original Message- From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com] Sent: Wednesday, May 05, 1999 12:23 PM To: 'Hans Mellberg'; 'emc-pstc' Subject:RE: Precompliance Testing I second that opinion. My experience shows SEVERE ambient issues with rooftop sites. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Hans Mellberg Sent: Wednesday, May 05, 1999 7:59 AM To: emc-p...@majordomo.ieee.org; bogda...@pacbell.net; Gary McInturff Cc: 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject:Re: Precompliance Testing Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.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). - 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: EMC Resources on the web
Randall, For a starter, check out the following URL: http://www.emclab.umr.edu/ http://www.emclab.umr.edu/ Jim Dr. Jim Knightene-mail: jlknigh...@ieee.org mailto:jlknigh...@ieee.org Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 619-485-2537 Fax: 619-485-3788 -Original Message- From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com] Sent: Wednesday, May 05, 1999 5:00 PM To: 'emc-pstc' Subject:EMC Resources on the web Hello! Greetings from Orange County! I am interested in compiling a list of valuable EMC related resources available on the web. If you kind guys and gals out there could address them to me, I will compile the results and post them for the group all at once. Thanks! -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org - 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: Precompliance Testing
What would that method be? Mat -Original Message- From: Gorodetsky, Vitaly [SMTP:vgorodet...@canoga.com] Sent: Wednesday, May 05, 1999 6:22 PM To: 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Subject: RE: Precompliance Testing In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -Original Message- From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com] Sent: Wednesday, May 05, 1999 12:23 PM To: 'Hans Mellberg'; 'emc-pstc' Subject:RE: Precompliance Testing I second that opinion. My experience shows SEVERE ambient issues with rooftop sites. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Hans Mellberg Sent: Wednesday, May 05, 1999 7:59 AM To: emc-p...@majordomo.ieee.org; bogda...@pacbell.net; Gary McInturff Cc: 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject:Re: Precompliance Testing Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.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). - 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: EMC Books
A very good book is from Henry W. Ott Noise Reduction Techniques in Electronic Systems -Original Message- From: ron_pick...@hypercom.com [mailto:ron_pick...@hypercom.com] Sent: Wednesday, May 05, 1999 9:43 AM To: emc-p...@ieee.org Subject: EMC Books To all, I am interested in knowing (and maybe others are, too) about the really good EMC books that are out and about. They may be practical, theoretical or anywhere in between. Areas of interest are, but are not limited to PWBs, backplanes and systems with considerations for design, troubleshooting, and noise reduction. For those having such handy references up on their shelves or just knowing of any, please feel free to reply. Replies may be either posted on this forum or sent to me privately. Either way, I will post the summary of results once the responses die off. BTW, I already know about a few books and will include those in the summary. This list of EMC references will likely be a valuable asset to any EMC professional, particularly those new to the game. Who knows, maybe we all might benefit from such a list. OK, let me have it/them. Best regards, Ron Pickard ron_pick...@hypercom.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). application/ms-tnef
Re: Characterizing a screen room
A reverberant chamber CAN be made to do service for precompliance; we did at a former employer. However, one must rely on experience and trickery. If you see a bump, move the antenna sideways a few feet. A reverberant chamber will have few peaks more than 6 dB above the actual value, but many deep, deep nulls, so you should move the antenna anyway. Test close; 1 meter. We ended up doing the testing with the operator inside the chamber, which was convenient for rotating manual tables, and using an older HP 141-T mainframe analyzer as the digital ones required modification to make them quiet enough. However, an 8590 only took a screen over the CRT and refurbishing the existing gasket by turning it around. We had to draw lines on the table for cable routing. Moving them away from the standard placement caused large difference in radiated fields. but this is PRE compliance, not the real thing. By using a standard cable set and routing, we were able to do good delta testing with results that proved out on later certification. A few cones or tiles strategically placed can _reduce_ though not eliminate resonances in the area of interest and this is always a help in reproducing readings. Just don't move the cones after you get them set up. Cortland == Original Message Follows Date: 05-May-99 08:52:12 MsgID: 1068-2224 ToID: 72146,373 From: Patrick Lawler INTERNET:plaw...@west.net Subj: Re: Characterizing a screen room Chrg: $0.00 Imp: Norm Sens: StdReceipt: NoParts: 1 Thanks for the responses, everyone. I was probably misleading when I used the phrase 'characterize a screen room'. It sounds too much like 'calibrate'. I was (and still am) pessimistic that we can any get decent information from a screen room. I was hoping to at least figure out a way to mark frequencies where the room was unreliable. Enough said. In light of comments made (especially the one below that mentions 20dB variations), it sounds like pre-scans to _discover_ problem spots are invalid as well. - If you saw a bump, it may be a reflection/resonance. - If you saw a quiet area of spectrum, it may be a null. It sounds like the process should be: 1) Discover frequencies by going to an OATS and doing a valid scan. 2) Put the same test setup in the screen room, and move it around until you saw the same relative amplitudes (ignore the absolute amplitudes). Mark the location of that exact test setup! 3) Work on the unit to reduce the relative amplitudes. BTW, I am going to try measurements in the parking lot. If a screen room isn't purchased, there should be lots of money available for lounge chairs and sun screen (I live in Southern California). On Wed, 28 Apr 1999 11:14:38 -0500, Patrick Lawler plaw...@west.net wrote: At 04:21 PM 4/27/99 GMT, Robert Bonsen rbon...@orionscientific.com wrote: My company is planning to purchase a screen room for radiated emissions precompliance testing. I'm aware that reflections can cause resonances and drastically influence readings. What kind of testing could I do to characterize the room (aside from simple experience)? The simple answer would be this: don't even try. You're much better off using the company parking lot to do pre-compliance radiated emissions testing. For conducted emissions/immunity, and to a certain extent radiated immunity, a shielded room is great. But not for RE. The reason for this is the reflections/resonances you get from the walls and the ceiling. You can get higher than 20 dB ripples on your measurements in an untreated (no absorber materials on walls/ceiling) shielded room. And these ripples are not very repeatable, they will change considerably with position (eg, moving your antenna or EUT less than an inch may result in field variations of much more than 10 dB). Because of these huge variations, testing cannot help you characterize your room and take these reflections into account in your emissions measurements. If you absolutely need to use a shielded room, try lining it with absorber materials. Even a few absorbers are better than none at all. Or try using another type of pre-compliance device like a GTEM or something similar. Another alternative would be to turn the shielded room into a mode-stir chamber. By rotating the properly designed mode stirrer, you will even out the variations which will result in fairly usable, repeatable numbers. The size of the room determines the usable frequency range. -- Patrick Lawler plaw...@west.net - 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 = - This message is coming from the emc-pstc discussion list.
ETS 300 328
Hi Group I have a client who needs to have ETS 300 328 type approval testing done. It is some kind of tag that uses 2.4 or 5.8 GHz RX frequencies. The lab also needs to be accredited for this specification by the national accreditation body of the country. Can anybody make suggestions for European or US labs. Thanks, Lizette de Vries-Venter SENIOR ENGINEER Division of Electronics and Appliances SABS Tel : +27 12 428 6990 Fax : +27 12 428 6523 Email : dvve...@sabs.co.za - 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: EMC Resources on the web
Randall: Please be sure to include our web site: http://www.tempest-inc.com and specially our EMC SUPPLIERS DIRECTORY: http://www.tempest-inc.com/suppliers.htm Listing in our directory is absolutely free, so it is a very complete one. We would like to build it up into the most complete definitive EMC directory in the world. We set up this site as a service to our clients, who are always asking where can I get conductive gaskets, who makes microwave absorbing material etc. This used to require us to do some research and then write a letter. Now we just say Check our suppliers directory. Lou At 05:00 PM 5/5/99 -0700, you wrote: Hello! Greetings from Orange County! I am interested in compiling a list of valuable EMC related resources available on the web. If you kind guys and gals out there could address them to me, I will compile the results and post them for the group all at once. Thanks! -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org Attachment Converted: C:\NETEMP\EMCResou - 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[2]: EMC Resources on the web
The following two sites provide a lot of very useful info links page:- http://www.emisoft.co.uk/special/links/alpha.htm You can simply search for country or type of equipment ! Infobase - on-line:- http://www.emisoft.co.uk/infobase/infobase.htm Useful list of specifications. __ Reply Separator _ Subject: Re: EMC Resources on the web Author: Alan E Hutley nutwoo...@email.msn.com at INTERNET List-Post: emc-pstc@listserv.ieee.org Date:5/6/99 7:35 AM Hi Randall Check out our web site www.emc-journal.co.uk Cheers Alan Hutley - Original Message - From: Flinders, Randall randall.flind...@emulex.com To: 'emc-pstc' emc-p...@majordomo.ieee.org Sent: Thursday, May 06, 1999 01:00 Subject: EMC Resources on the web Hello! Greetings from Orange County! I am interested in compiling a list of valuable EMC related resources available on the web. If you kind guys and gals out there could address them to me, I will compile the results and post them for the group all at once. Thanks! -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org - 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).
Re: EMC Books
Hi Ron, I've posted reveiws of a number of EMC books at www.conformity.com/book_store.html Disclosure: I also sell the books there. ron_pick...@hypercom.com wrote: To all, I am interested in knowing (and maybe others are, too) about the really good EMC books that are out and about. They may be practical, theoretical or anywhere in between. Areas of interest are, but are not limited to PWBs, backplanes and systems with considerations for design, troubleshooting, and noise reduction. For those having such handy references up on their shelves or just knowing of any, please feel free to reply. Replies may be either posted on this forum or sent to me privately. Either way, I will post the summary of results once the responses die off. BTW, I already know about a few books and will include those in the summary. This list of EMC references will likely be a valuable asset to any EMC professional, particularly those new to the game. Who knows, maybe we all might benefit from such a list. OK, let me have it/them. Best regards, Ron Pickard ron_pick...@hypercom.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). -- Jon D. Curtis, PE Curtis-Straus LLC j...@curtis-straus.com Laboratory for EMC, Safety, NEBS, SEMI-S2 and Telecom 527 Great Roadvoice (978) 486-8880 Littleton, MA 01460 fax (978) 486-8828 http://www.curtis-straus.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: Precompliance Testing
Please elaborate, as 7 of 9 would say. -- From: Gorodetsky, Vitaly [SMTP:vgorodet...@canoga.com] Sent: Wednesday, May 05, 1999 8:22 PM To: 'Flinders, Randall'; 'Hans Mellberg'; 'emc-pstc' Subject: RE: Precompliance Testing In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -Original Message- From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com] Sent: Wednesday, May 05, 1999 12:23 PM To: 'Hans Mellberg'; 'emc-pstc' Subject:RE: Precompliance Testing I second that opinion. My experience shows SEVERE ambient issues with rooftop sites. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Hans Mellberg Sent: Wednesday, May 05, 1999 7:59 AM To: emc-p...@majordomo.ieee.org; bogda...@pacbell.net; Gary McInturff Cc: 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject:Re: Precompliance Testing Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the
Re: EMC Resources on the web
Randall, In message 01be9718.c3615de0.randall.flind...@emulex.com you said: I am interested in compiling a list of valuable EMC related resources available on the web. If you kind guys and gals out there could address them to me, I will compile the results and post them for the group all at once. There is a listing at section 1.5 of the sci.engr.electrical.compliance (s.e.e.c) FAQ which may be helpful. The next issue will be posted to the newsgroup 15 May (with my usual pointer announcement to EMC-PSTC). The current (36th) issue is available per the sig. below. Please feel free to use this information. In turn, if your listing reveals resources I haven't covered, perhaps I may be permitted to add them to the FAQ? Regards, Bill. -- Bill Lyons - b...@lyons.demon.co.uk / w.ly...@ieee.org Maintainer of the sci.engr.electrical.compliance FAQ, archived at: HTML: http://world.std.com/~techbook/compliance_faq.html ASCII: http://www.lyons.demon.co.uk/seecfaq1.txt, seecfaq2.txt - 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: LFM test rig
If you just need the flow over the unit then get a good length of tube (air conditioning duct, round / square or rect in section) large enough to take your unit with space around it, a variable speed desk fan and a hot wire or mechanical (vaned) anemometer* (air velocity measuring instrument). Place unit in middle of tube, the fan at one end and if a hot wire anemometer then place thru a drilled hole in the duct positioned well down stream of unit, if a vaned type then probably just have to place at end of duct (but a little way in). The duct will need to be fairly long (wrt the UUT) to reduce turbulence effects. Knowing the air velocity, and cross sectional area of the duct you can calculate the volume flow rate. If you stick thermocouples in the duct before and after the UUT you could get a rough calculation of dissipation too, (depending on the flow rates involved). *Anemometers: http://rswww.com 188-1125 Pitot tube,Digitron,AF200,anemometer 188-1119 Anemometer,kit,Digitron,AF200 or hire one or borrow one from your local friendly heating and ventilation/ process extract company. Chris -Original Message- From: Dan Mitchell [mailto:dmitch...@eoscorp.com] Sent: Tuesday, May 04, 1999 12:50 AM To: 'emc-pstc' Subject: LFM test rig My company produces AC to DC Power Supplies. I have been directed to make a quick and dirty test rig that will allow me to put a predetermined airflow in LFM over the unit. Does anyone know of a website that describes something like this or have had experience building such a test rig and would be willing to share their expertise. Daniel W. Mitchell Product Safety Associate Engineer EOS Corp. - 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).
RE: Precompliance Testing
Jim, the noun for one who shleps is also shlep I don't know why, but as one who grew up in new york city, i can assure you that this is so. that is why you wont find shlepper maybe for the same reason that the plural for bagel is also bagel 1 bagel, 2 bagel, N bagel ( lim as n- infinity) why does this come under precompliance testing? because we'll all agree that the certification process is a shlep. Lou - 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: Precompliance Testing
In stationary case, such as OATS, there's a relatively inexpensive way of automatic cancelling ambients out . -Original Message- From: randall.flind...@emulex.com [SMTP:randall.flind...@emulex.com] Sent: Wednesday, May 05, 1999 12:23 PM To: 'Hans Mellberg'; 'emc-pstc' Subject: RE: Precompliance Testing I second that opinion. My experience shows SEVERE ambient issues with rooftop sites. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Hans Mellberg Sent: Wednesday, May 05, 1999 7:59 AM To: emc-p...@majordomo.ieee.org; bogda...@pacbell.net; Gary McInturff Cc: 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject:Re: Precompliance Testing Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.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). application/ms-tnef
EMC Resources on the web
Hello! Greetings from Orange County! I am interested in compiling a list of valuable EMC related resources available on the web. If you kind guys and gals out there could address them to me, I will compile the results and post them for the group all at once. Thanks! -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org application/ms-tnef
Take my Shield Room, Please!
Greetings Compliance Professionals! We happen to have a shield room we recently dismantled available to anyone who wants to come pick the thing up. It is a single-walled, steel room with a standard size door. The measurements of the chamber are 8 feet high by 12 feet wide by 16 feet long. It is designed in such a way that it would need substantial modifications if you were to try and hang absorbers on the ceiling and/or walls. The manufacturer of the chamber is unknown. It is currently dismantled and stacked on a pallet in our shipping area. Anyone interested in acquiring the chamber should contact me at the phone number / e-mail shown below. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org application/ms-tnef
RE: Precompliance Testing
It's always a good idea to get a spectrum analyzer some antennas and do a site survey before you build either the OATS or the shielded room. Knowing what the ambients are in advance can save you a lot of trouble and money in both cases. It makes sense, but hardly anyone does it. why? because they tend to think of the shielded room as part of the build out i.e. as office space, instead of as what it really is: an electronic instrument. like an antenna. Lou At 12:22 PM 5/5/99 -0700, you wrote: I second that opinion. My experience shows SEVERE ambient issues with rooftop sites. -- Sincerely, Randall T. Flinders EMC Engineer Emulex Network Systems V: (714) 513-8012 F: (714) 513-8265 randall.flind...@emulex.com __ __ __\ /__ __/ \__ E M U L E X Chairman Orange County Chapter IEEE EMC Society r.flind...@ieee.org -- From: Hans Mellberg Sent: Wednesday, May 05, 1999 7:59 AM To:emc-p...@majordomo.ieee.org; bogda...@pacbell.net; Gary McInturff Cc:'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject: Re: Precompliance Testing Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.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). Attachment Converted: C:\NETEMP\REPrecom - 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: Precompliance Testing
I'm betting it would be schlepee, schlepor, or dimwit. The latter being one of the irregular conjugations. Vitaly is right it would be nice to have a printable synonym for compliance engineer. The closest every used for me was some of the shift numeric keys such as #@(*$@!!! Heavy sigh! Gary -Original Message- From: Gorodetsky, Vitaly [SMTP:vgorodet...@canoga.com] Sent: Wednesday, May 05, 1999 10:03 AM To: 'Knighten, James L'; ed.pr...@cubic.com; 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org Subject:RE: Precompliance Testing Ed, Thanks for your eloquent linguistic excursion. I am wondering whether there is a noun derivative from SCHLEP. It could be a nice synonym for Compliance Engineering and schlepper would be a recognizable term in everyone's resume for compliance engineer. Best Regards -Original Message- From: Knighten, James L [SMTP:jk100...@exchange.sandiegoca.ncr.com] Sent: Tuesday, May 04, 1999 3:57 PM To: ed.pr...@cubic.com; Knighten, James L; 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org; Gary McInturff Subject: RE: Precompliance Testing Ed and Others, Thanks for the lesson in colloquial jargon. Obviously, I have been schlepping all these many years and did not realize it. Just a final note: MS Word 97's spell checker recognizes both schlep and schlepping. Jim Dr. Jim Knighten e-mail: jlknigh...@ieee.org mailto:jlknigh...@ieee.org Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 619-485-2537 Fax: 619-485-3788 -Original Message- From: ed.pr...@cubic.com [SMTP:ed.pr...@cubic.com] Sent: Monday, May 03, 1999 5:40 PM To: Knighten, James L; 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org; Gary McInturff Subject:RE: Precompliance Testing James: Schlep is a little descriptive verb I learned during a three year long exile in Northern New Jersey. It's Yiddish, meaning to haul, to drag, to sweat, to expend considerable energy with little reward and no respect. It's five steps forward and four steps back, plus you stub your toe. And there's a rock in your shoe. And you just might be developing a blister. Sisyphus was a schlepper. Yes, it's certainly a military term, although each service and era assigns a new name to it. But, now that I think about it, maybe a trip to the parking lot doesn't quite measure up to schlepping. ;-) Ed From: Knighten, James L jk100...@exchange.sandiegoca.ncr.com Subject: RE: Precompliance Testing Date: Mon, 3 May 1999 15:37:35 -0700 To: ed.pr...@cubic.com, 'Brent DeWitt' bdew...@ix.netcom.com, Allen Tudor allen_tu...@pairgain.com, emc-p...@ieee.org, Gary McInturff gmcintu...@packetengines.com Ed, I'm not familiar with the verb to schlep. Is this a specialized technical term, perhaps particular to EMC or to the military arena? Jim Dr. Jim Knighten e-mail: jlknigh...@ieee.org mailto:jlknigh...@ieee.org Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 619-485-2537 Fax: 619-485-3788 -Original Message- From: ed.pr...@cubic.com [SMTP:ed.pr...@cubic.com] Sent: Monday, May 03, 1999 2:38 PM To: 'Brent DeWitt'; Allen Tudor; emc-p...@ieee.org; Gary McInturff Subject:RE: Precompliance Testing The roof alternative has been done more than a few times. Emaco (now part of TUVPS) in San Diego had a pair of pneumatic lifts which travelled from their second floor through the roof. The test specimen and antenna could be set up on their respective elevators, pushed up through
RE: EMC Books
Ron, Check out the following URL for a list of books: http://www.emclab.umr.edu/ http://www.emclab.umr.edu/ Jim Dr. Jim Knightene-mail: jlknigh...@ieee.org mailto:jlknigh...@ieee.org Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 619-485-2537 Fax: 619-485-3788 -Original Message- From: ron_pick...@hypercom.com [SMTP:ron_pick...@hypercom.com] Sent: Wednesday, May 05, 1999 9:43 AM To: emc-p...@ieee.org Subject:EMC Books To all, I am interested in knowing (and maybe others are, too) about the really good EMC books that are out and about. They may be practical, theoretical or anywhere in between. Areas of interest are, but are not limited to PWBs, backplanes and systems with considerations for design, troubleshooting, and noise reduction. For those having such handy references up on their shelves or just knowing of any, please feel free to reply. Replies may be either posted on this forum or sent to me privately. Either way, I will post the summary of results once the responses die off. BTW, I already know about a few books and will include those in the summary. This list of EMC references will likely be a valuable asset to any EMC professional, particularly those new to the game. Who knows, maybe we all might benefit from such a list. OK, let me have it/them. Best regards, Ron Pickard ron_pick...@hypercom.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). - 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: ignition points for ...
Hi George: Can anyone point me to a resource (Book, Chart etc) that lists ignition points for various (flammable) materials ? Flash-ignition temperatures and self-ignition temperatures for various generic plastic materials are published in: International Plastics Flammability Handbook Jurgen Troitzsch Hanser Publishers, Munich, Vienna, New York Distributed in the United States and Canada by Oxford University Press ISBN 3-446-15156-7 Carl Hanser Verlag ISBN 0-19-520797-1 Oxford University Press More ignition temperatures for plastics, woods, paper, and textiles are published in: Flammability Handbook for Plastics -- Third Edition Carlos J. Hilado Technomic Publishing Company 265 Post Road West, Westport, Connecticut 06880 ISBN 087762-306-6 This book also contains data for glass transition temperatures decomposition temperatures specific heat thermal conductivity oxygen index ignition times heat release and much other data. Similar data is published in: Flammability Handbook for Electrical Insulation Carlos J. Hilado Technomic Publishing Company 265 Post Road West, Westport, Connecticut 06880 ISBN 87762-316-3 For an electrically-caused fire, there are three significant factors: 1. Temperature. The temperature of the electrical device must be greater than the self-ignition temperature of the candidate fuel material. 2. Thermal energy. The thermal energy coupled to the candidate fuel material must exceed the energy necessary to raise the fuel material to self-ignition temperature. 3. Thermal coupling. The thermal energy from the electrical device must be coupled into the fuel material at a rate very much greater than the thermal conductivity of the candidate fuel material. Without all three parameters, ignition of the fuel material is not possible. Best regards, Rich - Richard Nute Product Safety Engineer Hewlett-Packard Company Product Regulations Group AiO Division Tel : +1 619 655 3329 Effective 6/12/99: +1 858 655 3329 16399 West Bernardo Drive FAX : +1 619 655 4979 Effective 6/12/99: +1 858 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.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).
