EMC for medical devices
Hi Kevin. You asked: <1-What are the immunity standards used in Europe for medical devices? > I think you'll find that the IEC601 covers all the EMC requirements as well. Sorry, can't help with US requirements. Chris Dupres Surrey, 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).
RE: Lead Banned in Europe & Japan?
Hi Mel. You wrote: I get the impression, from various sources, that the removal of lead from the environment is a politically driven thing, in the same way that lead was driven from petrol. No one can doubt that Lead in petrol has environmental risks, but the headless chicken charge towards removing it with a blindfolded view on what comes in it's place seems to have left us in a worse position. I've read vatious learned articles about the use of long chain polymers, phenols, metals, etc. in either 'Super Unleaded or 'Lead Replacement Fuel' causing long and very long term environmental time bombs. Lead has been made illegal for use in UK domestic plumbing systems for a few years now, I think, and lead free solders seem to work OK, but according to one chap are more difficult to work with - causing additional time/cost, need higher temperatures - causing more fires to be started, , are more prone to leaks (presumeably due to the difficulties) - causing more insurance claims and house and property damage, and there seems to be some doubt about the safety of the fumes during soldering. The point is that I can't see how the world has benefitted overall. A secondary advantage of the need to remove solder may be to force companies to produce thick film designs, or cram more onto silicon with attendant positive effects on reliability, but not necessarily reduced cost - at least for low quanties. I read somewhere of PCB's composed of screen printed conductive polymer inks which would melt and 'glue' the SM component to the track thereby removing the need for solder at all, but I've never seen any products made like this. Maybe they are out there somewhere, I'm no expert. Lead also appears in the environment in many other ways of probably equal amounts. For instance free turning steels are made with added lead, 'C12 modified' is one that comes to mind, This sort of stuff is used to make mass produced articles - there must be millions of tons of this stuff made every year, and as it rusts (as it surely will) the lead is put into the environment. I applaud the activities of the Poliitically Correct, Environmental police, Nature preserving amongst us, but I sometimes wonder if their enthusiasm is insufficiently tempered with a longer term view, or what used to be called Wisdom. Charging ahead blindly into doing the right thing today may well be laying the foundations of catastrophe for the future, the truth is we probably don't know. Just a few moments of completely self opinionated, uninformed, hunch. Chris Dupres Surrey, 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).
Re[2]: electronics used in refueling
Hi Group. This stuff is covered in the UK by BASEEFA rules, and the various areas described variously as Ex and EEx etc. As an aside, whenever I have designed Intrisically safe equipment, I have left behind all the EEx equipment, the BASEEFA approved housings, the safety relays, and Zener barriers and so on, and simply used compressed air operated machines. These were primarily in the packaging industry filling containers with mysterious things like perfume, rubbing ointments, cough mixtures, even Gripe Water for babies, all amazingly flamable! Control logic was by fluidic logic elements (anyone here remember THOSE turkeys?). And I don't recall there being an EMC problem with that stuff either! Nor was there a problem with IEC1010. Now, there's an interesting thing... A control system which complies with the EMC directive, the Low Voltage Directive and the various Flammability regulations. Wonder if it will ever catch on? Food for thought. :-) Chris Dupres Surrey, 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).
Re: Copy of: GROUND COLOR CODE FOR CE MARK (EN60204-1)
Hi Rich. You wrote: I totally agree with your views, which you put much better than I. Just to be different/arkward, I always insist that the green/yellow wires have their own terminal. I'm sure that's not a 'requirement' and not always practicable, but I just don't want people fiddling with the protective wires, losing nuts, etc. Cheers, Chris Dupres Surrey, 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).
Copy of: Re: Copy of: GROUND COLOR CODE FOR CE MARK (EN60204-1)
-- Forwarded Message -- From: Chris Duprés, 100014,3703 TO: "Paul J Smith", INTERNET:paul_j_sm...@notes.teradyne.com DATE: 15/12/99 18:11 RE: Copy of: Re: Copy of: GROUND COLOR CODE FOR CE MARK (EN60204-1) Hi Paul. Totally agree. Tho' in practice I get people to put in seperate terminals for non-fault-current ground coinnections, but that's just me being picky. I also reckon that Green/Yellow is a reserved colour, and if you see it, then you don't fiddle with it, or give people a reason to fiddle with it, as it's there to protect. Chris Dupres Surrey, 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).
Copy of: GROUND COLOR CODE FOR CE MARK (EN60204-1)
-- Forwarded Message -- From: Chris Duprés, 100014,3703 TO: Christian Martí, INTERNET:cma...@efinet.com DATE: 14/12/99 18:36 RE: Copy of: GROUND COLOR CODE FOR CE MARK (EN60204-1) Hi Christian. You asked. My interpretation of the scene is that ALL wires that are there to provide a path for fault currents for the purposes of protective grounding, should be green/yellow, and should be given their own terminal. Any other wires, whether analogue reference grounds, screening, power returns, anything, should be the colour most related to their purpose. E.g. if the wire carries an a.c. control voltage common, then red. If the wire carries a d.c. control or power return, then blue. If an analogue reference then black. etc. etc. I do not expect to see different colour wires on one terminal post. Just an opinion, and the way I've been doing it for years. Chris Dupres Surrey, 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).
Fwd:CE DOC for "multiple listings"
Hi Jim/John. You asked: The regulatory authorities, and customs, simply need a declaration that the equipment complies... So the original equipment documentation stands. all you need do is make a declaration (A) for the technical files (not necessarily the TCF) that the equipment as sold is the same as the equipment that the D of C refers to, and make a new declaration of compliance but with the new manufacturer and type numbers. The equipment compliance is easily established by going back down the audt trail you have set up by the cross refering declaration.(A) Chris Dupres Surrey, 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).
warning label overkill?
Hi Sean. You wrote: Aha! Modern drinks are getting very complicated with their delivery chemistry... Guinness, and many other beers, are actually fizzed up on Nitrogen rather than Carbon Dioxide. This has commercial advantages in storage life and so on. In the UK, beer is dispensed, not with CO2 as in days of yore, but with something called Brewing Gas, a sterile cocktail of CO2 and N2. Does nothing for flavour but makes the beer last longer. Before the days of gas delivered beer we did, of course, have buxom barmaids working their pectorals on Hand pumped Ale, which delivered a foaming pint of fresh Bitter into a crystal clear jug. But that isn't the subject of this mail, sadly. In the UK, and maybe in the rest of the world too, beer is often packed in cans that contain a 'widget' (Guinness initiated term for these devices). When the can is opened, the Widget releases a stream of high velocity gas which stirs up the beer, so that when it is poured it develops a 'head' or a thick layer of sticky unpleasant foam, which the marketing people will have the proletariat believe is a good thing. The gas used in thick beers like Guinness is in fact artificially introduced Nitrogen, but as this stuff stays in solution much more readily than CO2 it needs a higher velocity gas stream to excite the beer to lose some gas and therefore form the glutinous 'head' so beloved of advertisers, but not of Ale afficianado's. The N2 in Guinness is also blamed for the fact that one gets Hiccups more easily from getting drunk on Guiinness than say a 'proper' live warm flat Ale like Brakespears 'Old Peculiar', which is brewed with yeast and Malt and is fizzy because of the natural CO2 produced by the fermentation process. But I digress. The point of all this is that your Giant Bottle of Dr. Pepper may be fizzed up on a different gas than Coke, and may have a much different rate of evolution of dissolved gasses, whatever they are. The warning label may be there to protect against law suits etc., or even used as an implied sales aid, as in "Our sugar solution with flavourings is much more fizzy than THEIR sugar solution with flavourings". Just a few ramblings on a subject dearer to my heart than most... Chris Dupres Surrey, 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).
RE: internet information
Hi Laura. You mention wire type: This looks like 0.75mm2 cross section area cable, and should be protected by a 5A fuse. Chris Duprés Surrey, 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).
Copy of: D of C - Who Signs?
-- Forwarded Message -- From: Chris Duprés, 100014,3703 TO: "Tony Reynolds", INTERNET:reyno...@pb.com DATE: 11/11/99 20:31 RE: Copy of: D of C - Who Signs? Hi Tony. You asked... < In other words is it acceptable to issue D of C's to suppliers/customers which have been signed by someone who has left the company.> In the case of EMC in the UK, the Electromagnetic Compatibility Regulations, statutory instrument SI 1992/2372, state that the declaration be signed by a 'esponsible person',. But in the 'Definition of Terms in the front, the term 'responsible person' is defined as a company! If the person who signs the documents retires, moves, dies, or whatever, resposibility for the declaration simply moves upwards to the next responsible person or a Director. Basically, Directors still get the blame if the original signer goes, after all, it is their company. Chris Dupres Surrey, 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).
Fans; m3/h to CFM
Hi Peter. 1 m3/h = 0.59 cfm. 1 cfm = 1.7 m3/h Chris - 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).
