I fear Mr. Murphy is looking over my shoulder. We just replaced a resistor because it fused too many times, in a product that has been in production for years. I wonder now if the engineer intended it to do just that. expletives deleted...
John Woodgate <[email protected]> wrote: In message <[email protected]>, dated Wed, 18 Jul 2007, Scott Xe writes: >I am wondering if this method is deem to be acceptable as a reliable >means to prevent overheating. Indeed, it does work, but unfortunately it's normally acceptable only if the resistors are specified as 'fusible resistors'. The reason is that, if they are just ordinary resistors, those from some manufacturers will fail open circuit without problems whereas others may burn up and burn the printed board. Some test houses consider that they have discretion to accept resistors of specified types that do always fail open-circuit without significant burning. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc _____ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites <http://farechase.yahoo.com/promo-gener c-14795097;_ylc=X3oDMTFtNW45amVpBF9TAzk NDA3NTg5BF9zAzI3MTk0ODEEcG9zAzEEc2VjA21haWx0YWdsaW5lBHNsawNxMS0wNw--> to find flight and hotel bargains. - ---------- ----------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
