RE: Kalmus Amplifier

From: Ahmad Fallah [mailto:emcesd2...@yahoo.com] Sent: Wednesday, April 14, 2004 3:39 PM To: emc-p...@majordomo.ieee.org Subject: Kalmus Amplifier Hello all, Would anyone in the group know of a shop that can repair and calibrate Kalmus amplifiers? We have sent our broadband amplifier out for

Re: Product Safety Symbol Legalities

Jo, While I agree with Bob and Rich that the use of markings will not provide you with an immunity from prosecution, some infer from such replies that providing warnings on the product or in the user instructions is a waste of time: this isn't so. Safety standards may require certain informat

Re: Defining an ESD Threat

After looking at the triboelectric series, it seems that the only time a human would charge negatively is after falling off an airplane! Otherwise, you are likely to be positevily charged. Hans Mellberg

Kalmus Amplifier

Hello all, Would anyone in the group know of a shop that can repair and calibrate Kalmus amplifiers? We have sent our broadband amplifier out for repairs, but the response has been very slow. Thanks, Ahmad Fallah

Re: laminated capacitor source

Eric Lifsey wrote: > > At 11:50 AM -0700 4/13/04, Fred Townsend wrote: > >> John Woodgate wrote: >> >>> I read in !emc-pstc that Chris Maxwell >>> wrote >>> (in >>> <39F7 60a00b5e946b51626

RE: Defining an ESD Threat

http://esda.org/esdbasics1.htm and ttp://www.rfcafe.com/references/electrical/triboelectric_series.htm give further details of the effect of distance apart on the triboelectric series chart. From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behal

Measurements under EN 61000-3-2 and 3-3

Did anyone already perform measurements under the directives EN 61000-3-2 and 3-3 using the equipment PHFx from Haefely? Other equipment suggestion? Many Thanks, Djonny -- UFSC - Universidade Federal de Santa Catarina GEMCO - Grupo de Engenharia em Compatibiliade Eletromagnética Caixa

RE: Product Safety Symbol Legalities

You are not going to get a clear answer. You liability is a probability calculation, no a yes or no answer. You can provide an attendant to personally warn users as they do the wrong thing and still have liability. If your product is attractive enough to distract someone's glance as they walk thro

RE: Rechargeable and Non-Rechargeable batteries

Chris - You might be able to find a barrel connector with a switch mechanism built in that will remove the batteries from the circuit automatically, as the plug is inserted. This won't allow for charging NimH or other secondary cells, but it's safer for primary cells. Long ago, I owned a few p

Re: Product Safety Symbol Legalities

Hi Joe: > As a manufacturer, are we covered from any liability as a result of the > user not being aware of what the symbol means? Do we assume that users > know to refer to the manual when they see that symbol? Are there any court > cases that have set precedents on this issue or r

emc-pstc Administrative Message

We are changing our listserver software from Majordomo to ListServ. We will announce the date for the change in future message. We anticipate no interruption in service; the changeover should be transparent. ListServ has a number of user-selectable features that are not provided by Majordomo

RE: Defining an ESD Threat

Ah yes, things get more complicated as usual... There is something called the Triboelectric series, which gives you some idea of the charging possibilities between materials There further apart two materials are in the series, the more charge you get from rubbing them together -- the mor

Re: Rechargeable and Non-Rechargeable batteries

Totally anecdotal reply. I have a Fluke 97 Scopemeter I purchased perhaps ten years ago. It has a wall-wart supply that recharges internal C-cell batteries, but it can also run on alkaline or other non-rechargeable C-cells. To the best of my knowledge, it is up to me to remember what batteries

Re: Defining an ESD Threat

That makes sense, but it only addresses half of the ESD environment question, which is how high a potential can something be charged up to, and how long will it hold the charge. The other half of the question is the charge-generating mechanism. If the surfaces one walks on are largely metal or co

Re: Rechargeable and Non-Rechargeable batteries

I read in !emc-pstc that Chris Maxwell wrote (in <39f7060a00b5e946b516261c077441c002a...@utexch1w.gnnettest.com>) about 'Rechargeable and Non-Rechargeable batteries' on Wed, 14 Apr 2004: >We generally test our equipment to EN 61010-1. We usually have >rechargeable batteries in our product; and

RE: Defining an ESD Threat

In addition to what Mike stated below the chances of an ESD even occurring in a high humidity environment is less, not to mention the charges of an even occurring in a high humidity environment will be smaller (ie not likely to reach 25kV for example). I agree with the comments made that the dis

Product Safety Symbol Legalities

Greetings, A common product safety symbol, the exclamation point within a triangle, is used to refer the user to the manual. General questions: As a manufacturer, are we covered from any liability as a result of the user not being aware of what the symbol means? Do we assume that users know

Re: Rechargeable and Non-Rechargeable batteries

Hi Chris: > 1. A case designed with a wall wart power input and a spot for AA sized > batteries. > > 2. The product would be designed to recharge AA sized NiMh batteries, > if installed. > > 3. Alternatively, the user could install AA sized alkaline batteries; > but they

RE: Defining an ESD Threat

Simple thing to do is take an ESD simulator and try charging some objects in that environment and see if they will hold a charge In high humidity, I'd expect charges to bleed off very quickly on most objects, which is why the ESD threat would be low In low humidity, of course, the charged

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Rechargeable and Non-Rechargeable batteries

Hello good people of the group. We generally test our equipment to EN 61010-1. We usually have rechargeable batteries in our product; and they’ve never really been a safety problem, other than adding diodes and “approved” charging methods. Usually the batteries that we use are so oddly shaped

Defining an ESD Threat

Esteemed List Members, I am working a problem where it would be helpful to define an ESD threat level in a particular high humidity, metallic surroundings environment - expectation is that ESD levels would be much lower than typical. I have a very high level concept of how it might be done, some

Re: zincor EMI contact

I read in !emc-pstc that Jan Vercammen wrote (in ) about 'zincor EMI contact' on Wed, 14 Apr 2004: >Because it is lower in the electrochemical table zinc oxide will protect >the iron. No, it doesn't work like that. Zinc is a 'sacrificial coating', unlike nickel, chromium etc. The zinc dissolv

zincor EMI contact

__ emc-pstc list, I have a question concerning Zincor, which I think is a trade name for steel coated with zinc. The zinc will protect the steel (iron) from oxidation. Because it is lower in the electrochemical table zinc oxide will protect the iron. The steel is coated wi

RE: NRTL vs. NRTL, NCB vs. NCB

Peter, NOTE: THIS EMAIL DOES NOT REPRESENT THE POLICY OR OPINION OF MY EMPLOYER. Thanks for your thoughtful response. Based on the many responses that I have received both on and off-line, it is evident that much of the compliance engineering community is now faced with NCBs and NRTLs that are

Re: laminated capacitor source

I read in !emc-pstc that Fred Townsend wrote (in <407c73c3.1080...@dctolight.net>) about 'laminated capacitor source' on Tue, 13 Apr 2004: >I don't understand. Xc and ESR are not normally related to each other. Are you >using modern math? It's an example of Q = 10^-6. -- Regards, John Woodgat

Re: laminated capacitor source

At 11:50 AM -0700 4/13/04, Fred Townsend wrote: >John Woodgate wrote: > >>I read in !emc-pstc that Chris Maxwell >> wrote >>(in >><39F706 a00b5e946b516261c077441c002a...@utexch1w.gnnettest.com