Had a mechanical engineer stop me in the hallway yesterday with an interesting question about a 9 volt battery. He has an electronic safe that wouldn’t open. It wouldn’t release the locking bar after the proper code was entered. He went out and bought a famous brand of battery and replaced the old one. No luck, called the manufacturer and they wouldn’t even talk to him until he installed a second famous brand of battery. A battery being a battery he then decided that the manufacturer was nuts and called a locksmith. He got the same answer from the locksmith. He took has new famous batteries back to the store and exchanged them for new second famous batteries. Put them in the electronics and click – whirr the safe opens.
Batteries are rated for voltage and amp hours. Those were identical between famous 1 and famous 2 but only famous 2 would supply enough power to drive the motor on the locking rods. I think car batteries have an additional rating of cranking amps is there something similar on 9 volt batteries? What’s the root cause in performance difference – internal bulk capacitance? The circuit logic would determine the max current flow out of the battery so the battery type shouldn’t matter – right? Maybe the R of the logic and the C of the battery changes the di/dt? The whole list may not be as curious about this as I so probably just going off line works best on the response. Plus if I’ve missed the absolutely obvious pointing out my mental inflexibility is less painless when not done in the open :-) Gary McInturff Reliability/Compliance Engineer Advanced Input Systems Esterline Corporation 600 West Wilbur Avenue Coeur d' Alene, Idaho 83815 Tel: 208 635 8306 Fax 208 635 8706 - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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 <emcp...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
