Just how many to test...???

Hi all, I've been approached and asked to advise on just how much to test... remember I'm a test lab so my answers may be biased. My client has three designs, the only difference is the transformer. A 24 V version for low voltage control systems ( about 49.5% sales volume ) A 120 V version for

RE: Meeting CISPR in Fast Ethernet board

If you are only using 2 pairs per connection in the RJ-21 cable, your problem may be that you are not taking advantage of the (Bob Smith) terminations on the unused 2 pairs that you could have in a standard RJ-45, 8-conductor cable. Just a few points we came across here with a 24-port card (2

Re: Books / EMC in Installations

The direct link to articles in the EMC Compliance Journal is http://www.compliance-club.com/archive1/archindex.html Happy Reading Alan E Hutley Editor www.compliance-club.com - Original Message - From: Wojciech Babij wojciech_ba...@nmss.com To: Gibling, Vic

RE: Apples and Oranges of FCC Data Correlation / Verification

Ken, I guess I stand corrected ! I spoke with Thomas Philips of the FCC, he gave me addition info. I had asked the same question to him that I had asking the group. Apparently I was mixing Apples with Oranges. With our products we are dealing (Information Equipment ) Class A part 15 sub part

RE: Circuit Breakers

Scott, I have not heard of surge protection device (SPD) being a requirement for circuit breakers, but I do know that SPDs are required to be after the main over-current protective device of a facility as per NEC 2002, article 285 and UL 1449, regardless if the SPD contains integral fusing or

Re: Radiation formula

Re: Radiation formulaLooks like Ott formulas. Personally I have trouble with those equations. There's obviously some trig functions that should be included in those equations to denote directionality or directivity, or there's some assumption(s) going on not stated. Those equations in general

Re: Creepage on PCB Internal Layers

In a message dated 8/15/2002, Gary McInturff writes: Okay, now don't everyone write to my layout guys, but I never bothered to tell them they could change the constraint files for closer routing on inner layers, so they do apply the spacings. I have try to keep an eye for it causing us

minimum distance for PWB inner layers (was creepage)

Hi Tom: In 60950, applicable clauses are 2.10.5.3 and 2.10.5.1 (I'm not reading genuine IEC/EN 60950, and I'm sorry if I'm wrong) - the former states that distance through insulation would be applied in such situation, and the latter set minimum thickness of 0.4mm for

Re: 48 Volt Telco Power Supply

Hi Jim, Transistor Devices makes standard and custom power supplies for many applications including Telecom. http://www.tdipower.com/ Good luck. Ed From: Jim Robson Reply-To: Jim Robson To: "'EMC-PSTC - forum'" Subject: 48

Re: Books / EMC in Installations

Hello Amund, See www.safetylink.com/bookshop.html and more specifically, www.safetylink.com/bookshop/william2.txt Regards, Art Michael On Thu, 15 Aug 2002 am...@westin-emission.no wrote: Looking for books which describes

(Fwd) Medical devices, current limit

Kim, This type of product may be covered by IEC 60601-2-10, PARTICULAR REQUIREMENTS FOR THE SAFETY OF NERVE AND MUSCLE STIMULATORS, or possibly, IEC 60601-2-14, PARTICULAR REQUIREMENTS FOR THE SAFETY OF ELECTROCONVULSIVE THERAPY EQUIPMENT I don't have a copy of these standards, but they

RE: Telecom Tests in Russia

Dear All, For telecom tests in Russia, please contact the following person. He's a real expert and is representing many Israeli and international telecom related companies. Youry Guinossian General Manager CEDICOM J. S. COMPANY 16 Mitischenskaya 3th str., Bld47, office 1101, Moscow, 129626,

RE: Books / EMC in Installations

In the EMC Compliance Journal there was a series of 6 articles on this subject. In the link below you can find them. They also mention other books and resources in those articles. http://internet.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Fwww.emc-journal.co.uk%2F Good reading,

RE: Books / EMC in Installations

Amund Try EMC for Systems and Installations by Tim Williams and Keith Armstrong. ISBN 0 7506 4167 3 Published by Newnes Thanks Ian Gordon -Original Message- From: am...@westin-emission.no [mailto:am...@westin-emission.no] Sent: 15 August 2002 14:25 To: emc-p...@majordomo.ieee.org

Circuit Breakers

Hi All, Does anyone have any information concerning the requirement for surge protection on circuit breakers that came into effect this June? This may just be for the EU and Laboratory equipment. Regards, Scott --- This message is from the IEEE EMC

Books / EMC in Installations

Looking for books which describes Good EMC practise when building a system / installations. Any suggestions ? Bets regards Amund Westin, Oslo / Norway --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion

RE: requirements for ITE power cords

George, the ITE safety standards require that the plug be rated for at least 125% of the equipment rating. I believe that the US National Electrical Code has the same requirement. Richard Woods Sensormatic Electronics Tyco International -Original Message- From: George Stults

RE: Canadian EMC

Compliance is legally required ofr ICES-003. You will find that the requirements are the same as FCC part 15 except for user information and equipment marking. You can download the standards at http://strategis.ic.gc.ca/SSG/sf01751e.html Richard Woods Sensormatic Electronics Tyco International

Commercial Water Purification System for Brazil and Russia

Dear All, I am trying to find out if there are any special safety/emc requirements for a commercial water purification system for Brazil and Russia. The system is used in commercial establishments such as laundromats, to purify the dirty water and re-use it over and over again. There may be

RE: Noise Levels for Household Appliances / Medical Devices

John, I am intersted in acoustic noise levels. This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail

Medical devices, current limit

Hi all I have a medical device under EU directive 93/42/EEC. It is a class IIa product and sends some small electrical pulses through the body for treatments. Does anyone know of any limit for the current ? (voltage is generated from battery and is max. 16Vdc) Does anyone have the

Re: Canadian EMC

You may try the following link for information http://strategis.ic.gc.ca/SSG/sf01698e.html or http://strategis.ic.gc.ca/SSG/sf01372e.html#MiscellaneousDocuments to look for what you need. Joe P Martin marti...@appliedbiosystems.com 08/15/02 03:11am Greetings, Canadian EMC standard for

Re: Meeting CISPR in Fast Ethernet board

Hi Bob, Is it broadband noise? Maybe a DC-DC converter on the board? Or do you have a peak at 62.5MHz? The 8B/10B encoding gets you to 125MB/s, and an 0101 idle pattern effectively gives you 62.5MHz. Best regards, Dave Bob Patel wrote: Hi! I had a question regarding meeting EMI on my board for

Re: Meeting CISPR in Fast Ethernet board

Based on little info you have provided, I am making the following assumptions. 1) The noise is broadband noise coming from MLT3 signal (by fast you mean 100 Mbps?). 2) It is not from the power supplly, which can also radiate similarly looking noise in this portion of the spectrum. You can

RE: Creepage on PCB Internal Layers

On Wed, 14 Aug 2002 15:22:21 -0400, John Juhasz john.juh...@ge-interlogix.com wrote: While a different standard was originally referenced in this thread, I'd like to consider for a moment Chris Maxwell's question ...there should be some minimum distance... on an inner layer of the

Re: Laser Warnings

Richard, Another good one is http://www.freetranslation.com/;. I usually translate the same text using both and compare the differences. There usually are some. I find this one easier to use when translating from another language into English if you are having to type text directly as it has

Re: Laser Warnings

Hi Richard, Try this URL. http://babelfish.altavista.com/translate.dyn I have used this in the past and it fairly accurate. I suggest do the translation and get someone who speaks the lingo to look at it for technical correctness. This is an inernational form, and I'm sure someone will be able