RE: FCC Importation Issue

Yes on two recent occasions. But we were able to get them released - before the steamroller! G From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Don Clayton Sent: Friday, January 31, 2003 2:36 PM To: emc-p...@majordomo.ieee.org Subject: FCC Importatio

RE: BeCu problem

I worked on a 1 MW, 160 GHz Gyrotron in 1982 that used a diamond waveguide window. Yes diamond is the up-and-coming power electronics material with 50X the thermal conductivity of copper. It is also starting to be used as a protective thinfilm material. Dave Cuthbert From: Fred Townsend [mail

Re: single fault conditions

Hi John: > >For example, at a previous employer, I observed several instances of FETs > >(in a 3kVA instrument) exploding and sending molten metal (mostly from the > >leads and the lead's solder pads) through chassis vents, that subsequently > >caused the surrounding cheesecloth to ig

Re: EN60950 protective conductor test (was Re: Circuit Breaker

Hi Nick: > >There is a proposed amendment to IEC/EN 60950-1 requiring a test of the > >protective conductor network at *prospective short-circuit current* for > >the time it takes for the mains circuit protective device to operate. > >The details are controversial at present, because

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that Pettit, Ghery wrote (in ) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003: >Cameras, monitors, etc are not ITE. CISPR 22 does not apply to them. *Video* cameras and *video* monitors are not ITE but either consumer products (IEC/EN 55013/55020) or profession

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that richwo...@tycoint.com wrote (in <846BF526A205F8 4BA2B6045BBF7E9A6A04675BD1@flbocexu05>) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003: >Even the standard for professional >video equipment, EN55103-1, references EN 55022 as does the generic >standard. Yes; thi

Re: single fault conditions

I read in !emc-pstc that boconn...@t-yuden.com wrote (in ) about 'single fault conditions' on Fri, 31 Jan 2003: >For example, at a previous employer, I observed several instances of FETs >(in a 3kVA instrument) exploding and sending molten metal (mostly from the >leads and the lead's solder pads)

Re: Unity Power Factor

I read in !emc-pstc that Rich Nute wrote (in <200301311805.kaa24...@epgc264.sdd.hp.com>) about 'Unity Power Factor' on Fri, 31 Jan 2003: > > > >Hi John: > > >> >Yes, delta-wye distribution transformer overheating >> >does occur due to the circulation and dissipation of >> >the triplen har

Re: BeCu problem

I read in !emc-pstc that Gregg Kervill wrote (in <004001c2c959$eb0daed0$7100a8c0@MENHADEN>) about 'BeCu problem' on Fri, 31 Jan 2003: >Good point John - then we can justify the $5,000 screwdriver. You can buy Japanese loudspeakers with cones coated in VPD diamond now. Not cheap, but not in the m

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that Wagner, John P (John) wrote (in <4203D61676D0AE468AA5CEA90A891C130288EEE8@cof110avexu4.global. avaya.com>) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003: >Ground loops Sorry, that's insufficient. What *safety* issue arises from ground loops? I agree that the

Re: Unity Power Factor

I read in !emc-pstc that Rich Nute wrote (in <200301311957.laa25...@epgc264.sdd.hp.com>) about 'Unity Power Factor' on Fri, 31 Jan 2003: >Fluke has a good explanation of the deleterious >effects of harmonics. See: > >http://www.fluke.com/ElectricPower/elec.asp Thank you. -- Regards, John W

Re: BeCu problem

John, tubes are like vacuum deposition chambers. I have difficulty believing that a fancy form of carbon would be of any use in molded structures, HV, or HVAC. These conditions are all found in radar tubes. Also, thanks to Greggs comment about fancy screw drivers, I remembered that BeCu screw dr

RE: Circuit Breaker Tripping Dring Fault Tests

The approach that CSA takes is sensible in that it includes both the long duration overload and high-current short circuit capabilities of the source. Depending on your situation you can end up needing to do one or both of the following: 1. Bond Impedance - run a current equal to 200% of the bran

Re: single fault conditions

I read in !emc-pstc that Rich Nute wrote (in <200301311743.jaa24...@epgc264.sdd.hp.com>) about 'single fault conditions' on Fri, 31 Jan 2003: >So, the failure of switching FETs could give rise >to both fire and shock, but should not do so if the >equipment construction is according to our variou

FCC Importation Issue

Has anyone out there had any problems with U.S. Customs holding a product for lack of FCC report or a declartion >from a manufacturer that product is indeed compliant? Thanks in advance, Don Clayton ESR Engineering Inc. This message is from the IEEE EMC Society Product Safety Technical Commit

RE: Country Deviations to IEC 60950

Richard, the national deviations of countries participating in the CB scheme can be found in the CB Bulletin that can be purchased from the IEC. Richard Woods Sensormatic Electronics Tyco International From: Richard Meyette [mailto:meye...@pacbell.net] Sent: Friday, January 31, 2003 12:54 PM T

EN60950 protective conductor test (was Re: Circuit Breaker Tripping Dring Fault Tests)

At 12:22 + 31/1/03, John Woodgate wrote: > >There is a proposed amendment to IEC/EN 60950-1 requiring a test of the >protective conductor network at *prospective short-circuit current* for >the time it takes for the mains circuit protective device to operate. >The details are controversial at

RE: EN55022:1998 and telecom ports

It is my understanding that such ports ARE included in the scope. Comments >from experts on CISPR/I indicate that digital TV tends to have higher emissions than "traditional" TV signals. The intent of the standard is clearly to limit emissions from cabling structures. Unless test data shows oth

Re: Unity Power Factor

Hi John: > Thank you for that and the rest of the information, which could prove to > be very helpful indeed. I would like to use it in my continuing efforts > to defuse the arguments between the former TC74 experts in TC108 and the > SC77A/WG1 people. May I say that the information c

RE: EN55022:1998 and telecom ports

Ground loops John P. Wagner Regulatory Compliance & Mandatory Standards AVAYA Regulatory Compliance Laboratory 1300 W. 120th Ave, Room B3-D16 Westminster, CO 80234-2726 Phone/Fax: (303) 538-4241 johnwag...@avaya.com From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Friday, January

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that Wagner, John P (John) wrote (in <4203D61676D0AE468AA5CEA90A891C1302A01467@cof110avexu4.global. avaya.com>) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003: >By the way, CISPR/F has nothing whatsoever to do with ITE. It is CISPR/I and >formerly CISPR/G OOPS

Re: EN55022:1998 + A1:2000

I read in !emc-pstc that drcuthbert wrote (in ) about 'EN55022:1998 + A1:2000' on Fri, 31 Jan 2003: >How can a ferrite clamp be called a CMAD Common Mode Absorption Device? It >reduces EM radiation >by reducing the current through the "antenna", not by absorbing RF. It >could, however, be called

RE: EN55022:1998 and telecom ports

GR-1089 does allow a get-out for intra-building surges for STP if grounded at both ends of the STP cable. Some customers still insist that intra-building Surges are applied to the conductors regardless of the cable type, STP or UTP. [We 'design in' Intra-building surge protection (as a mimimum) fo

Re: BeCu problem

I read in !emc-pstc that don_borow...@selinc.com wrote (in ) about 'BeCu problem' on Fri, 31 Jan 2003: >I have seen stainless steel used as battery contacts. The contacts >developed an oxide on them that made it difficult to get power from the >battery. Seems to me that some plating could solve t

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that richwo...@tycoint.com wrote (in <846BF526A205F8 4BA2B6045BBF7E9A6A04675BCE@flbocexu05>) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003: >The standard also includes tests for coax and >alludes to emissions caused by imperfect shielding. That seems to imply that

RE: BeCu problem

Good point John - then we can justify the $5,000 screwdriver. Gregg From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Woodgate Sent: Friday, January 31, 2003 10:35 AM To: emc-p...@majordomo.ieee.org Subject: Re: BeCu problem I read in !emc-pst

RE: EN55022:1998 + A1:2000

Dave Cuthbert wrote >> The nick name for MFJ is "Mighty Fine Junk". << Yes it is -- or has been. But I'll jump in here to add that while I've in the past often been underwhelmed by the quality of some MFJ equipment, I was favorably impressed with my MFJ-259B. And it is quite useful. I have one

RE: Proposed new EMC Directive.

Ian, I recommend that you visit the European Commission's EMC web site: http://europa.eu.int/comm/enterprise/electr_equipment/emc/index.htm You will find a guide that describes the file requirements and your obligations for reselling a private branded product. The basic requirements are not going

RE: EN55022:1998 and telecom ports

Unfortunately, EN 55022 is the only available emissions standard for CCTV products used for security applications. Even the standard for professional video equipment, EN55103-1, references EN 55022 as does the generic standard. Perhaps the CISPR ITE committee is not aware that they are affecting a

RMCEMC Bonus Feb Meeting Reminder

To all interested parties: Announcing the RMCEMC Bonus February Meeting Presenter: Colin Brench, HP Principal Member of technical Staff (Bio) Date : Feb 5th 2003 Location : Front Range Community College, Westminster Colorado. Room Timberline (S117) Times : 5:30 -6:30 Social Hour at the Commu

RE: EN55022:1998 and telecom ports

David Sterner wrote: >> UTP has been repeatedly shown to radiate less than STP. << Telcordia GR-1089 exempts STP from intrabuilding surges; the shield is assumed to carry them. This makes it attractive for US telecom designers whose equipment uses Ethernet. Cortland This message is from t

Re: ISM Equip

Hi Bill, Can you let me know which type of ISM equipment you need info on? For Medical equipment there are requirements but not Scientific. Industrial depends. Thanks, Kind Regards, Tian Wang-Mendez / Sr. Program Manager EMC Compliance Management Group 670 National Avenue, Mountain View, C

Re: Unity Power Factor

Hi John: > >Yes, delta-wye distribution transformer overheating > >does occur due to the circulation and dissipation of > >the triplen harmonics in the primary (delta) winding. > > Thank you for that and the rest of the information, which could prove to > be very helpful indeed

Country Deviations to IEC 60950

Group, I have a question regarding the country deviations to IEC 60950, 3rd Edition. Some of the country specific differences are referenced in the IEC standard as notes to the Subclause. For example, 4.3.6 has notes regarding the testing of direct plug-in equipment in Australia and the United K

Re: single fault conditions

Hi John: > >The Bad: some FETs fail very violently, and can actually be a fire hazard > >and/or shock hazard in open-frame switchers; > > Really? There doesn't seem to be enough combustible material to cause a > fire hazard, and an open-frame switcher always has to be in some sort

RE: Tektronix AM503 question

LO - internal backup battery weak 50 - not listed 81 - not listed if the error was actually 580, the amp was not able to complete a probe offsett adjustment. Make sure the probe jaws are completly closed. the firmware for my units only displays error codes > 260. Brian -Original Messag

RE: Circuit Breaker Tripping Dring Fault Tests

John - This proposal is based on a North American D1 Deviation to IEC60950, Subclause 2.6.3.3, and is derived from CSA 22.2 No 0.4. I have a product in my lab that this applies to and two more products coming in to which it will also apply. Regards, Peter L. Tarver, PE Product Safety Manager

RE: single fault conditions

>The Bad: some FETs fail very violently, and can actually be a fire hazard >and/or shock hazard in open-frame switchers; >>Really? There doesn't seem to be enough combustible material to cause a >>fire hazard, and an open-frame switcher always has to be in some sort of >>outer enclosure, does

Re: BeCu problem

Hi Jan, In addition to health aspects, BeCu is incompatible with most enclosure materials and coatings (to prevent rust and corrosion) used in equipment. After a couple of weeks a BeCu finger in contact with a chassis will leave a black smudge, the corrosion byproducts resulting >from the bat

RE: EN55022:1998 and telecom ports

David, Where in article 3.6 of CISPR 22 is the term "multi-user" used? Also, please keep in mind that the ferrite clamps are used only for testing radiated emissions from table top EUTs. This telecom port conducted emissions issue (hence the need for article 3.6) is entirely separate. Ghery

Proposed new EMC Directive.

Hi everyone. We have been working through consequences of the New Proposed Emc Directive. As we are not a large electronics company so we will not be able to quote all the standards we quoted today as we don't use equipment detailed in that said standard. The new directive states we will have

Re: BeCu problem

I read in !emc-pstc that Fred Townsend wrote (in <3e3a35fb.6ecc...@poasana.com>) about 'BeCu problem' on Fri, 31 Jan 2003: >BeO has seven times better thermal conductivity than AlO (alumina). There is >no real substitute for BeO at high power levels. It is still used by the >Military in high po

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that david_ster...@ademco.com wrote (in <2DF7C54A75B dd311b61700508b64231002c5b...@nyhqex1.ademconet.com>) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003: >Earthing STP shields at both ends is potential safety hazard, How does a safety hazard arise? -- Regards, J

RE: EN55022:1998 and telecom ports

Richard, Cameras, monitors, etc are not ITE. CISPR 22 does not apply to them. Ghery Pettit Intel From: richwo...@tycoint.com [mailto:richwo...@tycoint.com] Sent: Friday, January 31, 2003 7:20 AM To: emc-p...@majordomo.ieee.org Subject: RE: EN55022:1998 and telecom ports OK, so "widely dis

RE: EN55022:1998 and telecom ports

As the requirements for conducted emissions on "telecom" ports developed, definitions changed repeatedly -- all intended to describe the same cabling. At one point, "extensive networks" was used which I think better describes the situation. However, then the question is "What is extensive?" Als

Tektronix AM503 question

Does anyone out there have a service manual for a Tektronix AM503A current probe amplifier? I need to know what error code 50 followed by "LO" followed by 81 means. Thanks in advance, Brent DeWitt This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussio

RE: EN55022:1998 and telecom ports

OK, so "widely dispersed" is a key element in determining if a network needs to be tested. That is consistent with the problem of long balanced pairs having common mode emissions. The standard also includes tests for coax and alludes to emissions caused by imperfect shielding. That seems to imply

RE: EN55022:1998 + A1:2000

The MFJ-259B is available from MFJ Enterprises, a ham radio accessory company. The nick name for MFJ is "Mighty Fine Junk". Autek also makes a similar device although I haven't tried one. The MFJ-259B SWR analyzer is basically a handheld impedance meter. It's also good for checking the input Z of

RE: BeCu problem

Jan - Both Be and BeO pose health risks. While I can't point to anything to support the claim, BeCu will probably become a part of the product take back/recycling. I did text searches of the WEEE and the RoHS Directives and found no mention of Be in any form. Be and its compounds are looked a

RE: EN55022:1998 + A1:2000

How can a ferrite clamp be called a CMAD Common Mode Absorption Device? It reduces EM radiation by reducing the current through the "antenna", not by absorbing RF. It could, however, be called a CMAD Common Mode Attenuation Device. Dave Cuthbert From: John Woodgate [mailto:j...@jmwa.demon.co

Re: BeCu problem

I have seen stainless steel used as battery contacts. The contacts developed an oxide on them that made it difficult to get power from the battery. Seems to me that some plating could solve that problem however. There are no good substitues for BeO in all applications. AlN is better than alumina

RE: Helmholtz article

See the May 2002 issue From: drcuthbert [mailto:drcuthb...@micron.com] Sent: Friday, January 31, 2003 6:55 AM To: emc-p...@ieee.org Subject: Helmholtz article Here is the link to the Conformity magazine article: Magnetic Field Calibration: Unwinding The Helmholtz Coil, by Isidor Straus http:/

ISM Equip

Treggers, I understand there are compulsory safety and EMC requirements for ITE in Korea. What about ISM equipment? Bill Bill Wilson W.W.Wilson Associates 508-651-1388 wwwil...@rcn.com www.wwwilsonassoc.com

Re: Unity Power Factor

I read in !emc-pstc that Rich Nute wrote (in <200301292324.paa09...@epgc264.sdd.hp.com>) about 'Unity Power Factor' on Wed, 29 Jan 2003: >Yes, delta-wye distribution transformer overheating >does occur due to the circulation and dissipation of >the triplen harmonics in the primary (delta) windi

Re: Unity Power Factor

I read in !emc-pstc that Rich Nute wrote (in <200301301638.iaa15...@epgc264.sdd.hp.com>) about 'Unity Power Factor' on Thu, 30 Jan 2003: >As Ken Javor described, in the USA, voltage >distortion is largely a local (privately-owned >wiring) premises problem due to "excessive" >series resistance

FW: #18328: Engineer (TEMPEST); Grand Rapids, MI

Forwarding for Pauline, please reply to her. Jim From: Pauline Rodela [mailto:paul...@midcom.com] Sent: Thursday, January 30, 2003 4:06 PM Subject: #18328: Engineer (TEMPEST); Grand Rapids, MI Hello, I obtained your name and email from the IEEE EMC Society Directors listing at http://www.iee

Re: EN55022:1998 + A1:2000

I read in !emc-pstc that Gert Gremmen wrote (in ) about 'EN55022:1998 + A1:2000' on Thu, 30 Jan 2003: >The official name is CMAD Common Mode Absorption Device. >(before John makes one himself ;<)) You mean me? And do you mean before I make a name for the device or before I make a DIY device it

Re: single fault conditions

I read in !emc-pstc that boconn...@t-yuden.com wrote (in ) about 'single fault conditions' on Wed, 29 Jan 2003: >Yes sir, this is another thing I've wondered about; i.e., simulating the big >bus cap (short) SFC by applying a mechanical short accross the terminals. >Does not really de

Re: Translations: Chinese to English

I read in !emc-pstc that Collins, Jeffrey wrote (in <1d4e6e0235bdf84bb58bace5086d9c518...@wntcsdexg03.oni.com>) about 'Translations: Chinese to English' on Wed, 29 Jan 2003: >Can you recommend a company or individual who is competent ( and reasonable >$$$ ) in translating technical documents from

Re: Unity Power Factor

I read in !emc-pstc that Ken Javor wrote (in <0h9j008afer...@mtaout03.icomcast.net>) about 'Unity Power Factor' on Thu, 30 Jan 2003: >Yes I am in the US so clearly I must have been mistaken. Seriously, when >that business started in 1989 there were relatively few PCs in use there. >"PC cubes" w

Re: EN55022:1998 + A1:2000

I read in !emc-pstc that drcuthbert wrote (in ) about 'EN55022:1998 + A1:2000' on Wed, 29 Jan 2003: >And I have used an MFJ-259B (only >$260) to measure ferrites from 1.7 to 170 MHz. What is an MFJ-259B and where can I buy one? -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jm

Re: EN61000-3-2/3 applicability

I read in !emc-pstc that richwo...@tycoint.com wrote (in <846BF526A205F8 4BA2B6045BBF7E9A6A04675BB7@flbocexu05>) about 'EN61000-3-2/3 applicability' on Thu, 30 Jan 2003: >Sam, Section 5 of EN61000-3-2 lists examples of the environments and a >partial listing include houses, shops, offices, cinemas

Re: EN55022:1998 and telecom ports

I read in !emc-pstc that richwo...@tycoint.com wrote (in <846BF526A205F8 4BA2B6045BBF7E9A6A04675BB4@flbocexu05>) about 'EN55022:1998 and telecom ports' on Thu, 30 Jan 2003: >EN55022:1998 defines telecommunication ports as " Ports which are intended >to be connected to telecommunications networks (

Re: Circuit Breaker Tripping Dring Fault Tests

I read in !emc-pstc that Peter L. Tarver wrote (in ) about 'Circuit Breaker Tripping Dring Fault Tests' on Thu, 30 Jan 2003: > >John - > >That impedance value is suprisingly high, It applies to 230 V 50 Hz systems only. SC77A/WG2 has been given a too limited amount of data on 120 V 60 Hz syste

Re: single fault conditions

I read in !emc-pstc that boconn...@t-yuden.com wrote (in ) about 'single fault conditions' on Wed, 29 Jan 2003: >The environment being considered is a switching power supply. The technique >that safety agencies use to simulate a SFC on a power FET does not seem, >IMHO, to simulate the actual fail

Re: single fault conditions

I read in !emc-pstc that boconn...@t-yuden.com wrote (in ) about 'single fault conditions' on Thu, 30 Jan 2003: >I am also concerned that there are products on the market, tested in good >faith, that would be unsafe for a more probable SFC, that would not be >tested for, in accordan

Re: Circuit Breaker Tripping Dring Fault Tests

I read in !emc-pstc that John Woodgate wrote (in ) about 'Circuit Breaker Tripping Dring Fault Tests' on Wed, 29 Jan 2003: >I read in !emc-pstc that Peter L. Tarver >wrote (in ) >about 'Circuit Breaker Tripping Dring Fault Tests' on Wed, 29 Jan 2003: >>In a typical household operating at 120V, i

Re: UK DTI applying generic standard to test hair dryer for conformity

I read in !emc-pstc that Paul Chan wrote (in <006901c2c801$82c70a00$27086...@tuvglobal.com>) about 'UK DTI applying generic standard to test hair dryer for conformity' on Thu, 30 Jan 2003: >I have read a news regarding on 3 Sept 02, UK Department of Trade Industry >(DTI) applied EMC Generic stand

Helmholtz article

Here is the link to the Conformity magazine article: Magnetic Field Calibration: Unwinding The Helmholtz Coil, by Isidor Straus http://www.conformity.com/featurearticlesarchive.html#June%202002 I used the formulas in this article to design and build an active ELF loop antenna. Dave Cuthber

RE: EN55022:1998 and telecom ports

Ghery - Ethernet on coax (10Base2) is indeed multi-user. Calling Ethernet/FE on twisted pair 'multi-user' ignores the fact each cable conect two and only two units. Hub/switch ports receive the signal, then reconstitute the signal before re-transmitting to the next unit. With EN55022:1998 +A:2

RE: request sources for UL and/or IEC accessibility probe (test finger)

Paul, Try this place. A good place to do business. http://www.productsafet.com/pages/main.html Scott Douglas Senior Compliance Engineer Narad Networks 515 Groton Road Westford, MA 01886 phone: 978 589-1869 dougl...@naradnetworks.com www.naradnetworks.com A

Re: BeCu problem

I can't help you with the regulations but I can clarify the usage of Beryllium a bit. When Beryllium is added to copper it makes it very hard. It is used in gaskets to make them springy. Stainless steel is a poor substitute because it lacks both the electrical and thermal conductivity. So far

BeCu problem

Hello EMC/PSTC-list, I have a question concerning Berylium Copper (BeCu). Even though this is not a direct EMC oriented question, it is or could be, indirectly, a serious problem in the EMC shielding of our products. I have been asked if BeCu can still be used in Europe and the USA (and the res