RE: IEC950 vs. EN 60950
What Pete is describing is quite fitting for Europe and the US.However, in the rest of the world, what is accepted and/or required varies as much as the different flora and fauna around the world. South Africa, for example, does not care for compliance to an EN60 950 document, but will accept compliance via a CB Scheme report to IEC 950 (but not to EN60 950!). What we do, therefore, is have the CB report and Certificate reference both EN60 950 and the IEC 60 950 document!!! There are other countries (and since their requirements are constantly changing, I will not point them out here) that will accept US safety and/or FCC Part 15 compliance.Other countries will require compliance and/or testing to their own national standards in their own country. You need to approach each case individually at any given time since requirements, agencies, addresses, and even governments are constantly changing. Tania Grant, Lucent Technologies, Octel Messaging Division tgr...@lucent.com -- From: Peter E. Perkins [SMTP:peperk...@compuserve.com] Sent: Tuesday, July 20, 1999 1:46 PM To: Biggs, Daniel (IndSys, GEFanuc, NA) Cc: PSNetwork Subject: IEC950 vs. EN 60950 Daniel PSNet, IEC 950 - now IEC 60950 - is an international standard, meaning that all countries participating in the development of the standard bring their codes and practices to the table and some subset of the same is included in the final standard. EN 60950 is the European version of that standard. It includes specific Euro codes and practices which were not agreed to by the international community. These differences are important and must be adhered to in complying with the standard. You cannot claim compliance to the EN for CE marking purposes without meeting these deltas. In the same way, UL 1950 is the American version of IEC 950. It includes many American changes that result from our codes and practices here. In order to get NRTL certification to this standard, the equipment must comply with these deltas, too. From a certification point of view, the IEC standard is not important. The equipement must meet the locally adopted version for compliance. From a standards development or future looking viewpoint the IEC standard is driving the local standards in the highest or most general way. The manufacturer's dream is to see all of these standards be exactly equal in wording - i.e. no local deltas. Probably not in my lifetime - there are some basic underlying requirements in each market. In America, for instance, the NEC contains basic requirements which will not change soon; plus there are legally driven requirements based upon case law that companies have to meet in America - such as the use of ANSI labels else the product markings are deficient. So, get the local standards and comply with them... that's the requirement. :) br, Pete Perkins - - - - - Peter E Perkins Principal Product Safety Consultant Tigard, ORe 97281-3427 +1/503/452-1201 phone/fax p.perk...@ieee.org email visit our website: http://ourworld.compuserve.com/homepages/peperkins - - - - - - 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: double the pleasure
Sometimes it happens to me too... Muriel Knighten, Jim L wrote: To All: Am I the only one receiving two identical copies of postings to this news group? Jim Knighten Dr. Jim Knightene-mail: jim.knigh...@sandiegoca.ncr.com mailto:jim.knigh...@sandiego.ncr.com Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 858-485-2537 Fax: 858-485-3788 * Notice the Area Code change from 619 * - 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). -- == Muriel Bittencourt de Liz GRUCAD - Grupo de Concepção e Análise de Dispositivos Eletromagnéticos Universidade Federal de Santa Catarina Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL Fone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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: Computer classification in EN61000-3-3
IMO - Section A. List some test parameters on a variety of equipment: Photocopiers, Hairdryers or portable tools, etc and may cause voltage spikes when turned on. The test limits describe the acceptable amount of voltage drop as 3 or 4% depending( steady state and max relative voltage change). There is a time limit imposed as well, but sort of a rule of thumb if your equipment is suddenly demanding a lot of power that could cause the overhead lights to flicker (this flicker isn't always perceivable on a onsy-twosy basis) you probably need to comply to these limits. This isn't video flicker etc or switch mode power supply stuff. I don't foresee a lot of ITE equipment falling into this category. The occasionally firing of the disk drives etc shouldn't be drawing this kind of power. I have my asbestos underwear on just in case I'm wrong; somebody will let me know. Gary . -Original Message- From: David Gelfand [SMTP:gelf...@memotec.com] Sent: Wednesday, July 21, 1999 10:27 AM To: emc-p...@majordomo.ieee.org Subject:Re: Computer classification in EN61000-3-3 Bonjour Benoit et al, EN 61000-3-3 section 6.1 states: Tests shall not be made on equipment which is unlikely to produce significant voltage fluctuations or flicker. How do you interpret the phrase? David. David Gelfand P.Eng Approvals Group Leader Memotec Communications Inc. Montreal Canada -Original Message- From: Benoit Nadeau bnad...@matrox.com To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org Date: Wednesday, July 21, 1999 12:36 PM Subject: Computer classification in EN61000-3-3 Bonjour de Montreal, After a careful reading of EN61000-3-3, we tried to identify the testing conditions for computer devices and peripherals. Appendix A of the standard details the conditions for various household equipments. In section A.11 they specify that the test condition for consumer electronic devices is to measure only the dmax (maximum 4% of voltage variation). Are computer and peripheral considered as consumer electronic device ? If it is the case, then we don't need a flikermeter to meet the EN61000-3-3. Any comments ? -- Benoit Nadeau, ing. M.ing. (P.Eng., M.Eng) Gerant du Groupe Conformite (Conformity Group Manager) Matrox http://www.matrox.com/ -- 1055, boul. St-Regis Dorval (Quebec) Canada H9P 2T4 Tel : (514) 822-6000 (x2475) FAX : (514) 822-6275 Internet : bnad...@matrox.com, mailto:bnad...@matrox.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). - 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: double the pleasure..RE: double the pleasure
No you're not ! No you're not ! I get them too, but not all the time.. George -Original Message- From: Knighten, Jim L [SMTP:jk100...@exchange.sandiegoca.ncr.com] Sent: Wednesday, July 21, 1999 1:15 PM To: emc-pstc list server (E-mail) Subject: double the pleasure To All: Am I the only one receiving two identical copies of postings to this news group? Jim Knighten Dr. Jim Knighten e-mail: jim.knigh...@sandiegoca.ncr.com mailto:jim.knigh...@sandiego.ncr.com Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 858-485-2537 Fax: 858-485-3788 * Notice the Area Code change from 619 * - 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).
Career Opportunities - Hillsboro OR, San Jose CA, Redmond WA
Greetings, CKC Laboratories currently has career opportunities available for qualifies individuals to join our compliance teams at our Fremont CA, Hollister CA, Hillsboro OR, and Redmond WA locations. CKC Laboratories is a full service certification facility specializing in EMC, Wireless, Safety and Telecom certifications for Worldwide product acceptance. Interested applicants are welcome to e-mail, fax or send resumes for the following positions. Please see our web site for further details about our company. http://www.ckc.com POSITIONS AVAILABLE: Hillsboro, OR - EMC Engineer - Intermediate Level - Technical Service Advisor - Administrative Assistant Fremont CA - EMC Engineer - Entry or Intermediate Level - Technical Service Advisor Hollister, CA - EMC Engineer - Entry or Intermediate Level Redmond, WA - Technical Service Advisor DESCRIPTION: EMC Engineer ? Independently evaluate, select, and apply test standards, EMC testing techniques, test procedures, and criteria, using judgment in making minor major adaptations and modifications. ? Understand basic EMC theory as it relates to testing, troubleshooting, and retrofitting. ? Assignments usually include the following: Troubleshooting and retrofitting a design to comply with standards using filters, ferrite's or grounding principles, preparation of test specifications, research investigations, report preparation, and other activities of limited scope requiring knowledge of principles and techniques commonly employed by EMC Engineers. ? May supervise or coordinate the work of EMC Engineers and / or Test Engineers who will assist on specific assignments. Technical Service Advisor Examination of a customers certification needs. Preparation of formal written quotations. Involving an EMC consulting engineer for design consultation when necessary. Follow-up on existing potential customer leads in-person sales calls. Coordination with Customer Service (Scheduling) to obtain test engineering time for the customer. Certification / project management as necessary. Service follow-ups to ensure customer satisfaction. Send Resume to: CKC Laboratories, Inc. Human Recourses Department 5473-A Clouds Rest Mariposa, CA 5338 Fax 209 742-6133 lphill...@ckc.com http://www.ckc.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: Lightning and GFCI - OOPS!
OOPS! In my recent posting, I proved that human memory is a very fallible thing. I stated that in the failed GFCI outlet I examined, the sense coil measured current in the GROUND conductor. Thankfully, Jim Eichner pointed out that such a circuit would not fulfill the most important need for a GFCI. This forced me to sweep away some of the cobwebs and peer more closely into the gray matter filing cabinet. I now remember that the HOT and NEUTRAL leads both passed through the sense coil. Otherwise, the device was exactly as described. My apologies for posting incorrect information, and thanks to Jim for getting me back on track. Scott Lacey *** Jim Eichner responded: I was under the impression that the sense coil does NOT sense current in the ground wire, but rather it senses any imbalance between the currents on the Line and Neutral conductors. The difference is crucial, in that only the latter can detect fault current going directly to ground (e.g. by a water pipe) rather than back to the receptacle ground. *** - 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: Computer classification in EN61000-3-3
Bonjour Benoit et al, EN 61000-3-3 section 6.1 states: Tests shall not be made on equipment which is unlikely to produce significant voltage fluctuations or flicker. How do you interpret the phrase? David. David Gelfand P.Eng Approvals Group Leader Memotec Communications Inc. Montreal Canada -Original Message- From: Benoit Nadeau bnad...@matrox.com To: emc-p...@majordomo.ieee.org emc-p...@majordomo.ieee.org List-Post: emc-pstc@listserv.ieee.org Date: Wednesday, July 21, 1999 12:36 PM Subject: Computer classification in EN61000-3-3 Bonjour de Montreal, After a careful reading of EN61000-3-3, we tried to identify the testing conditions for computer devices and peripherals. Appendix A of the standard details the conditions for various household equipments. In section A.11 they specify that the test condition for consumer electronic devices is to measure only the dmax (maximum 4% of voltage variation). Are computer and peripheral considered as consumer electronic device ? If it is the case, then we don't need a flikermeter to meet the EN61000-3-3. Any comments ? -- Benoit Nadeau, ing. M.ing. (P.Eng., M.Eng) Gerant du Groupe Conformite (Conformity Group Manager) Matrox http://www.matrox.com/ -- 1055, boul. St-Regis Dorval (Quebec) Canada H9P 2T4 Tel : (514) 822-6000 (x2475) FAX : (514) 822-6275 Internet : bnad...@matrox.com, mailto:bnad...@matrox.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).
double the pleasure
To All: Am I the only one receiving two identical copies of postings to this news group? Jim Knighten Dr. Jim Knightene-mail: jim.knigh...@sandiegoca.ncr.com mailto:jim.knigh...@sandiego.ncr.com Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 858-485-2537 Fax: 858-485-3788 * Notice the Area Code change from 619 * - 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).
Product Safety -Australia and UL1950 ITE
Greetings. This is my first post here. I do both EMC testing and product safety, but primarily product safety testing and filings through Underwriter's Laboratories acting as both reviewer and submitter [Technical Administrator] in a two-person safety department. Reason I present here before you is a bit of a problem I am having with UL concerning an obscure requirement. I am wondering if UL is singling me out over an issue that has to do with the Australian/New Zealand specification for DC Component from AC Equipment. Specifically this is AS/NZS 3260:1993 appendix 3 (pp 366-67) or IEC 60950 appendix 3. I have an AC powered ITE product that uses two switch mode power supplies output connected in current sharing redundancy with AC input full wave rectification i.e. 'balanced input' design that I have certificates for but in which do not specify compliance with the appendix 3 criteria. Lab tests show these to comply with the 5ma limit for DC neutral leakage but readings are extremely fluctuating and difficult to pin down, but compared to other power supplies that do have certification, reads within limits. The problem is I supply UL with schematics that prove the supply has AC input full wave rectification (balanced input according to the spec and therefore exempt from testing) yet they are demanding test data. Up to that point, I was using a Voltech PM3000A power analyzer for all consumption related measurements including DC component (harmonic zero). When I submitted test measurement data, UL rejected it claiming (correctly) that the meter used had insufficient specs to perform the measurement according to the appendix 3 spec for test equipment. (Voltech had no idea what the PM3000A's series rejection ratio was until I inquired and had them perform cal lab tests to determine the figure -which was dismal at best) Since then, I have acquired a Fluke 8842A DMM (with 85dB NMRR) and attempted measurements but these readings are so wildly fluctuating that I would have to tally and average the data manually (or through GPIB) -which would destroy the accuracy of the measurements taken by a 5.5 digit meter!! Incidentally, the difference in accuracy (or believable numbers) between the Fluke and Voltech is nearly the same. I favor the Voltech with its 'data dump' feature straight to printed copy -very handy. Ok, so now I've got more questions than UL Northbrook or Melville can answer...I ask them how to accurately take measurements of a fluctuating phenomenon and they answer me with something to the effect that their QAS department is negotiating with Australia's counterpart in efforts to gain better understanding. Meanwhile, I've got a product that has been waiting since December '98 to gain full CB for the AS/NZS market. In contrast, I have taken measurements using both Voltech and Fluke meters of all our products and found one product that seems to fail the measurement but has certified compliance to appendix 3 through a New Zealand NRTL. When I asked the failing product's power supply vendor what test instrument they used to submit data they reported 'Voltech PM3000A' so I know they are not being honest. When I talk with the lab in New Zealand they claim 'balanced input' design and therefore no test needed, which UL has accepted. Is anybody else having a ride with UL like this? -I'm dipped in hogwash here... how 'dat for openers? Kyle Ehler kyle.eh...@lsil.com mailto:kyle.eh...@lsil.com Assistant Design Engineer LSI Logic Storage Systems Division 3718 N. Rock Road U.S.A. Wichita, Kansas 67226 Ph. 316 636 8657 Fax 316 636 8889 Fax 316 636 8315 - 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).
Computer classification in EN61000-3-3
Bonjour de Montreal, After a careful reading of EN61000-3-3, we tried to identify the testing conditions for computer devices and peripherals. Appendix A of the standard details the conditions for various household equipments. In section A.11 they specify that the test condition for consumer electronic devices is to measure only the dmax (maximum 4% of voltage variation). Are computer and peripheral considered as consumer electronic device ? If it is the case, then we don't need a flikermeter to meet the EN61000-3-3. Any comments ? -- Benoit Nadeau, ing. M.ing. (P.Eng., M.Eng) Gerant du Groupe Conformite (Conformity Group Manager) Matrox http://www.matrox.com/ -- 1055, boul. St-Regis Dorval (Quebec) Canada H9P 2T4 Tel : (514) 822-6000 (x2475) FAX : (514) 822-6275 Internet : bnad...@matrox.com, mailto:bnad...@matrox.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: Lightning and GFCI
Yes, lightning can damage GFCIs I had one destroyed in my house. It punched a hole from a phase electrode right into the side of the solenoid and out the other to ground. Not much that lightning can't take out. The test you suggested is just that done by the test button. It connects a resistor from load side phase to ground. You could go further with a variable resistance to characterize the exact trip point, but I doubt the setpoint is likely to change much. Lightning would be more likely to destroy it or not, instead of readjust it. GFCIs come in at least a couple varieties. Some trip when activated. Most residential ones are this type. The disconnect solenoid needs to be tripped to disconect. With these, testing is necessary to verify they are able to measure and trip under leakage conditions. Others have a solenoid which is energized while set. They have to be manually set after power is on. These will trip if power fails or the electronics otherwise fails to keep the solenoid energized. These types are favored if there is a chance of an open neutral on the supply side of the GFCI, for example GFCIs used at the end of extension cords. Bob Johnson Ned Devine wrote: Hello, Recently my house got struck by lightning. One of the things that happened was that all of the GFCI's tripped. I reset them and tested them (pushed the little test button) and they seem to work. My neighbor stated that when their old house got struck by lightning all of the GFCI's were damaged. They did not find out till they went to sell it 3 years later and it failed the electrical inspection. Now, she is a software engineer, so I am taking her comments with a grain of salt :-), but Does anyone know if lightning could damage the GFCI's so that they would test OK but still not work? If I want to test the GFCI's, could I just hook a 15 k ohm, 5 Watt resistor from line and neutral to ground? Has this happened to anyone else? Ned Devine Entela, Inc. Program Manager III Phone 616 248 9671 Fax 616 574 9752 e-mail ndev...@entela.com PS The EMC testing you do is working. Most of the new electronics survived. The only newer items that died were the garage door opener and the cordless answering machine. - 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). ---BeginMessage--- Yes, lightning can damage GFCIs I had one destroyed in my house. It punched a hole from a phase electrode right into the side of the solenoid and out the other to ground. Not much that lightning can't take out. The test you suggested is just that done by the test button. It connects a resistor from load side phase to ground. You could go further with a variable resistance to characterize the exact trip point, but I doubt the setpoint is likely to change much. Lightning would be more likely to destroy it or not, instead of readjust it. GFCIs come in at least a couple varieties. Some trip when activated. Most residential ones are this type. The disconnect solenoid needs to be tripped to disconect. With these, testing is necessary to verify they are able to measure and trip under leakage conditions. Others have a solenoid which is energized while set. They have to be manually set after power is on. These will trip if power fails or the electronics otherwise fails to keep the solenoid energized. These types are favored if there is a chance of an open neutral on the supply side of the GFCI, for example GFCIs used at the end of extension cords. Bob Johnson Ned Devine wrote: Hello, Recently my house got struck by lightning. One of the things that happened was that all of the GFCI's tripped. I reset them and tested them (pushed the little test button) and they seem to work. My neighbor stated that when their old house got struck by lightning all of the GFCI's were damaged. They did not find out till they went to sell it 3 years later and it failed the electrical inspection. Now, she is a software engineer, so I am taking her comments with a grain of salt :-), but Does anyone know if lightning could damage the GFCI's so that they would test OK but still not work? If I want to test the GFCI's, could I just hook a 15 k ohm, 5 Watt resistor from line and neutral to ground? Has this happened to anyone else? Ned Devine Entela, Inc. Program Manager III Phone 616 248 9671 Fax 616 574 9752 e-mail ndev...@entela.com PS The EMC testing you do is working. Most of the new electronics survived. The only newer items that died were the garage door opener and the cordless answering machine. - This message is coming from the emc-pstc discussion list.
Re: Japanese requirements
Dear Paul, For the Japanese EMI requirements go to the VCCI website and look up their information. Some is free and some has to be ordered. They are pretty responsive people when asked a question. The Website address is: http://www.vcci.jp/vcci/vccie/. For safety Japan follows the CB scheme for some requirements. You need to check with JETRO as to what the requirements are for your product. If it is CB scheme I strongly recommend that you either order or get yourself a copy of the CB Bulletin's as these give very clear guides on the national deviations for various product type requirements in the CB scheme countries. JETRO web site address is: http://www.jetro.co.uk/ and for the CB scheme it is http://www.cbscheme.org. Some manufacturers mistakenly assume that CB scheme means the standard is identical and all you need to do is submit reports and certificates in each country. This is not the case in part because the electrical systems are not the same in all countries. I hope this helps. Regards G. Rae Dulmage, B. Comm., President TelApprove Services Corporation 1+613 257 3015 http://www.angelfire.com/on/telapprove Paul Smith wrote: Hello All, I'm curently looking into requiremetns for Japan (both EMC Safety). I guess it's VCCI for the EMC and IEC specs. for safety (presuming Japan are part of the CB scheme?). The product in question will be a dimmer for use in theatre/TV studios (large rack type 70+ ways, not the small 6 ways portable type). Can anybody point me in the right direction for the required standards and if special (i.e. in Japanese) then a UK based agency where I can buy them from/get a translation of. Thanks Paul This E-mail brought to you by Excite's free E-mail service. Get your own E-mail address at http://www.excite.co.uk - 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).
FW: CISPR 22 / EN 55022
EMC Regulations, standards and specs (particularly CISPR) relating to commercial electronic equipment are aimed at controlling the pollution electromagnetic spectrum and protecting radio communications against radiated and conducted(MAINS PORT) spurious emissions . In particular, CISPR 22 addresses the emissions limits at Mains Port in Table 1 and 2 of clause 5.1. Mains relates to a public utility supplying generally AC power, the corruption of which would create a havoc particularly with AM reception, possible Aircraft/.Airport comms and remote toys operating at 27 MHz. Historically, in the civil sector, the parameters of the LISN were determined by analysing the RF impedance of domestic, Industrial and other mains supply systems. The mean values were found to be well represented by an equivalent circuit of 50 ohm in parallel with 50uH. Since good agreement was possible between several countries this LISN network was adopted by CISPR in publication 16 as being suitable for AC supply. CISPR 14 treats DC ports as additional terminals, with the relaxed limits of Table 1 and recommends the use of a HV Probe (where a LISN cannot be used). So, the measurement and limits of DC Ports have been specified in a CISPR publication, which could at least provide a guideline and be consistent with the general CISPR philosophy. You could always use a HV Probe with the tighter Class B limits, but at the end of the day (and noting your commercial environment and not domestic) economic realities would prevail and perhaps you would opt for the more lenient Additional terminals limits of CISPR 14. We note that DC Port measurements have not been mandated in any CISPR 22 publication. In the interim period and if required by the client, I would tend to go this way. Regards Arun Kaore EMC Engineer ADI Limited Systems Group Test Evaluation Centre Forrester Road, St Marys NSW 2760 P O Box: 315, St Marys NSW 1790 Tel: 61 2 9673 8375 Fax: 61 2 9673 8321 Email: kao...@sg.adi-limited.com.au mailto:kao...@sg.adi-limited.com.au -Original Message- From: VENTER, Francois [SMTP:fven...@alcatel.altech.co.za] mailto:[SMTP:fven...@alcatel.altech.co.za] Sent: Tuesday, 20 July, 1999 15:44 To: emc-p...@majordomo.ieee.org mailto:emc-p...@majordomo.ieee.org Subject:CISPR 22 / EN 55022 Hi All Due to local demand for the test, we have started to conduct conducted emission tests on dc supply lines to the equipment. The reason why it is demanded is that in a telecoms centre one does not have the equipment connected to a dc battery. It is most of the time connected in parallel with other equipment to a vast dc network. This test is of course not a requirement in CISPR 22 or EN 55022. My question relates to the limit lines in CISPR 22/EN 55022. Would you say that it is valid to apply the limits in the standard to a conducted emission test on a dc line. I currently use the same test procedure and LISN for both ac and dc tests - Rhode Schwarz (Receiver) Scwarchbeck (LISN). I get very repeatable results. Your comments would be appreciated. Yours faithfully FA Venter (PR. Eng.) Alcatel Altech Telecoms Senior Development Engineer - EMC fven...@alcatel.altech.co.za mailto:fven...@alcatel.altech.co.za PO Box 286, Boksburg, 1460, South Africa Tel +2711 899-6658 Fax +2711 899-6590 - 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).
