Re: ITE Class A vs B Emissions
I read in !emc-pstc that Charles Grasso chasgra...@hotmail.com wrote (in f109fkprctci90gp8yj0...@hotmail.com) about 'ITE Class A vs B Emissions', on Tue, 5 Feb 2002: Has the CE+CE=CE idea been adopted? Absolutely not in general, only for electrical switchboards, AIUI. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: ITE Class A vs B Emissions
Thanks to everyone that responded to my query. Here is my original question and a synopsis of the replies. Question: We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Replies: My business/commercial/industrial ITE clients have usually aimed for Class B but if they did not get there, Class A has always been accepted by their customers. Most customers do not know the difference very few will insist on Class B (tending toward laoratories and such locations where small signals are involved, and interference would be likely). Class A business ITE is the norm from my perspective. I see very few products of this category subjected to the more severe Class B limits. I surveyed our customers and changed from Class B to Class A a few years ago, and have had no issues. We are an OEM provider and have not had any issues marketing and selling class A products. We have found that the requirement of being Class B Certified was a perception of our marketing department and was not consistent with our customer's requirements or needs. As such, we have found it viable and feasable to move Class A ITE product to customers in all parts of the world without issue. We have sold class A video products (intended for business use only) via distributors for the whole life of the EMC Directive and have never been questioned. There are many business products that are labeled or otherwise identified as Class A when used in a commercial environment and Class B when used in a residential environment. Although it can be argued that my products are Class A, we design our products to meet Class B. I have had the occassion where I was at the limit and was under pressure to release the product that I have taken Class A. Primarily we've designed for Class B as a 'specmanship'game with the competitors who mostly have Class A. Thanks again to all who replied. Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: ITE Class A vs B Emissions
I read in !emc-pstc that John Juhasz jjuh...@fiberoptions.com wrote (in 2a1845f4cde8d511b4400090279c703b938...@bctexc10.na.ilxi.net) about 'ITE Class A vs B Emissions', on Tue, 5 Feb 2002: I believe the push to ensure Class B for other than 'heavy' industrial, 'Push' is not the appropriate word. It is *established* in the Generic Standards that Class B is for residential, ***commercial and light industrial** environmentS (plural); in the process lumping all three together as one homogenous EMC environment, which they certainly are not. results from the fact that real estate is (or is becoming) a premium in many areas in Europe and you find 'light' industrial directly in a residential environment. This is even apparent within many metropolitan areas in the U.S. Indeed, that is the reason why the three environments were lumped together, but it is an over-simplification. For example, if John Doe complains that he can't listen to his radio at work, he will probably be told that he doesn't come to work to listen to the radio, but to search for pictures of ladies on the Web. (;-) -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: SV: ITE Class A vs B Emissions
Isn't there a another gotcha? I recall a connection between with the Class A emissions being coupled to the Heavy Industrial Immunity standard. My old company shipped with Class A emissions and 024 as the immunity. We based our decision on our installed base prior to the EU having acceptable EM performance. From: am...@westin-emission.no Reply-To: am...@westin-emission.no To: emc-p...@majordomo.ieee.org Subject: SV: ITE Class A vs B Emissions Date: Tue, 5 Feb 2002 09:29:30 +0100 From chapter 4.1 in CISPR 22:1997: Class B ITE is intended primarily for use in the domestic environment and my include: - equipment with no fixed place of use; for example, portable equipment powered by built-in batteries; - telecommunication terminal equipment powered by a telecommunication network; - personal computers and auxiliary connected equipment From chapter 4.2 in CISPR 22:1997: Class A ITE is a category of all other ITE which satisfies the class A ITE limits but no the class B ITE limits. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use: WARNING - This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures. So, you have the possibility to go for Class A. But I also recall that may test laboratories / notified body classifies class A as a heavy industrial environment. Business/office environment are often classified as residential, commercial and light industrial and therefore class B. Amund -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av richwo...@tycoint.com Sendt: 4. februar 2002 22:40 Til: emc-p...@majordomo.ieee.org Emne: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. _ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: ITE Class A vs B Emissions
Hi - I must ask: Has the CE+CE=CE idea been adopted? If so then the discussion on emissions levels is moot as non-compliant products are being released on the market place anyway. From: CE-TEST cet...@cetest.nl Reply-To: CE-TEST cet...@cetest.nl To: am...@westin-emission.no, emc-p...@majordomo.ieee.org Subject: RE: ITE Class A vs B Emissions Date: Tue, 5 Feb 2002 10:22:36 +0100 For export to Europe: The CISPR22 Class A limits are equal to the ones for Generic heavy Industrial equipment. Using (not selling) CISPR22 Class A equipment in a residential or light industrial equipment may very well be contrary to the essential requirements of the EMC directive and the CISPR22/EN55022 Class A limits may not automatically create presumption of compliance with them. This may lead to prosecution if your equipment is causing interference and is being checked by the authorities. I do not say the risk is very high, but this clause in the EN55022 has already drawn attention from the EC EMC consultant as being different from the generic class system, and may be modified in the future. (in spite of CENELEC objections). For now selling and using Class A ITE is allowed, but *I* would not rely on that for future developments. Gert Gremmen -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of am...@westin-emission.no Sent: dinsdag 5 februari 2002 9:30 To: emc-p...@majordomo.ieee.org Subject: SV: ITE Class A vs B Emissions From chapter 4.1 in CISPR 22:1997: Class B ITE is intended primarily for use in the domestic environment and my include: - equipment with no fixed place of use; for example, portable equipment powered by built-in batteries; - telecommunication terminal equipment powered by a telecommunication network; - personal computers and auxiliary connected equipment From chapter 4.2 in CISPR 22:1997: Class A ITE is a category of all other ITE which satisfies the class A ITE limits but no the class B ITE limits. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use: WARNING - This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures. So, you have the possibility to go for Class A. But I also recall that may test laboratories / notified body classifies class A as a heavy industrial environment. Business/office environment are often classified as residential, commercial and light industrial and therefore class B. Amund -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av richwo...@tycoint.com Sendt: 4. februar 2002 22:40 Til: emc-p...@majordomo.ieee.org Emne: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server
RE: ITE Class A vs B Emissions
Although it can be argued that my products are Class A, we design our products to meet Class B. I have had the occassion where I was at the limit and was under pressure to release the product that I have taken Class A. Primarily we've designed for Class B as a 'specmanship' game with the competitors who mostly have Class A. Additionally I believe there's still debate in Europe that unless your product is 'heavy'industrial, it should be Class B - this reinforces my desire toward avoiding Class A entirely. I am certain the Class B will prevail. As a Boy Scout leader I believe in the scout motto 'Be Prepared'. I believe the push to ensure Class B for other than 'heavy' industrial, results from the fact that real estate is (or is becoming) a premium in many areas in Europe and you find 'light' industrial directly in a residential environment. This is even apparent within many metropolitan areas in the U.S. John Juhasz Fiber Options Bohemia, NY - Original Message - From: richwo...@tycoint.com To: emc-p...@majordomo.ieee.org Sent: Monday, February 04, 2002 1:40 PM Subject: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: SV: ITE Class A vs B Emissions
I read in !emc-pstc that am...@westin-emission.no wrote (in LFENJLPMMJB mhpeibnilkejlccaa.am...@westin-emission.no) about 'SV: ITE Class A vs B Emissions', on Tue, 5 Feb 2002: But I also recall that may test laboratories / notified body classifies class A as a heavy industrial environment. Business/office environment are often classified as residential, commercial and light industrial and therefore class B. This is true. However, we know that a lot of Class A equipment IS used in commercial, light industrial and even residential environments, in Europe as well as elsewhere, and, AFAIK, the level of complaints of interference is not excessive. I presume that this is due to the low usage of AM reception now, in most areas, and the low expectations of those that do receive it, on $10 trannies or $50 boom boxes, not magnificent Grundig-type table radios with 4.495 kHz overall bandwidth. So there are good grounds, IMO, for a single set of limits, nearer Class A than Class B. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: ITE Class A vs B Emissions
I read in !emc-pstc that Enci e...@cinepower.com wrote (in 3.0.6.32.2 0020205082333.00aed...@mail.cinepower.com) about 'ITE Class A vs B Emissions', on Tue, 5 Feb 2002: I have often wondered exactly why there are two classes in EN55022. The limits are pretty similar, does a 13dB difference in conducted emission QP limits really make a difference above 5MHz? I know the 23dB difference 5MHz (conducted emissions) helps with products that have a SMPS, for example. In the radiated emissions the difference is 10dB. In the real world is there really a need for two limits? Probably not. The CISPR Class B limits were probably (even I am too young to know!) influenced by the situation in Germany in the 1950s, when their AM (only sort available) broadcasting was severely restricted to low powers and frequencies that no-one else wanted. Consequently, man-made noise had to be kept low as well. I suppose CISPR/H is considering a single set of limits, but that might be the Class B limits if people who want something else don't bother to take part in the work. Note that this is a matter of general interest, not just for ITE, so it should not be a matter for CISPR/I alone. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: ITE Class A vs B Emissions
For export to Europe: The CISPR22 Class A limits are equal to the ones for Generic heavy Industrial equipment. Using (not selling) CISPR22 Class A equipment in a residential or light industrial equipment may very well be contrary to the essential requirements of the EMC directive and the CISPR22/EN55022 Class A limits may not automatically create presumption of compliance with them. This may lead to prosecution if your equipment is causing interference and is being checked by the authorities. I do not say the risk is very high, but this clause in the EN55022 has already drawn attention from the EC EMC consultant as being different from the generic class system, and may be modified in the future. (in spite of CENELEC objections). For now selling and using Class A ITE is allowed, but *I* would not rely on that for future developments. Gert Gremmen -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of am...@westin-emission.no Sent: dinsdag 5 februari 2002 9:30 To: emc-p...@majordomo.ieee.org Subject: SV: ITE Class A vs B Emissions From chapter 4.1 in CISPR 22:1997: Class B ITE is intended primarily for use in the domestic environment and my include: - equipment with no fixed place of use; for example, portable equipment powered by built-in batteries; - telecommunication terminal equipment powered by a telecommunication network; - personal computers and auxiliary connected equipment From chapter 4.2 in CISPR 22:1997: Class A ITE is a category of all other ITE which satisfies the class A ITE limits but no the class B ITE limits. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use: WARNING - This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures. So, you have the possibility to go for Class A. But I also recall that may test laboratories / notified body classifies class A as a heavy industrial environment. Business/office environment are often classified as residential, commercial and light industrial and therefore class B. Amund -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av richwo...@tycoint.com Sendt: 4. februar 2002 22:40 Til: emc-p...@majordomo.ieee.org Emne: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson
SV: ITE Class A vs B Emissions
From chapter 4.1 in CISPR 22:1997: Class B ITE is intended primarily for use in the domestic environment and my include: - equipment with no fixed place of use; for example, portable equipment powered by built-in batteries; - telecommunication terminal equipment powered by a telecommunication network; - personal computers and auxiliary connected equipment From chapter 4.2 in CISPR 22:1997: Class A ITE is a category of all other ITE which satisfies the class A ITE limits but no the class B ITE limits. Such equipment should not be restricted in its sale but the following warning shall be included in the instructions for use: WARNING - This is a class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures. So, you have the possibility to go for Class A. But I also recall that may test laboratories / notified body classifies class A as a heavy industrial environment. Business/office environment are often classified as residential, commercial and light industrial and therefore class B. Amund -Opprinnelig melding- Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]På vegne av richwo...@tycoint.com Sendt: 4. februar 2002 22:40 Til: emc-p...@majordomo.ieee.org Emne: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: ITE Class A vs B Emissions
I have often wondered exactly why there are two classes in EN55022. The limits are pretty similar, does a 13dB difference in conducted emission QP limits really make a difference above 5MHz? I know the 23dB difference 5MHz (conducted emissions) helps with products that have a SMPS, for example. In the radiated emissions the difference is 10dB. In the real world is there really a need for two limits? Enci - Original Message - From: richwo...@tycoint.com To: emc-p...@majordomo.ieee.org Sent: Monday, February 04, 2002 1:40 PM Subject: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: ITE Class A vs B Emissions
Hi Richard, My business/commercial/industrial ITE clients have usually aimed for Class B but if they did not get there, Class A hass always been accepted by their customers. Most customers do not know the difference very few will insist on Class B (tending toward laoratories and such locations where small signals are involved, and interference would be likely). Mike Harris/Teccom - Original Message - From: richwo...@tycoint.com To: emc-p...@majordomo.ieee.org Sent: Monday, February 04, 2002 1:40 PM Subject: ITE Class A vs B Emissions We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
ITE Class A vs B Emissions
We currently design our products to comply with the Class B emissions limits of EN 55022, but I am getting a lot of pressure from engineering to allow the limits to be raised to Class A. The equipment is intended for business use only. I understand that Class A is legal in the EU for business equipment, and our customers don't seem to understand or care if the equipment is Class A or B. So, the question is this - Are you successful in marketing your business ITE as Class A? Richard Woods Sensormatic Electronics Tyco International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
