David, others, I don't know what happened - I just used "Reply" but noticed that the message looked weird letter type, even in my Outlook client. I hope this message is just plain text, so all can see it now.
Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: cwa...@proxim.com Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Cor van de Water via EV Sent: Tuesday, August 19, 2014 11:54 AM To: Electric Vehicle Discussion List Subject: Re: [EVDL] CALB bolt terminals getting hot - It is not a problem to create a known current in the order of 10 Amps either by using the existing charger on the vehicle or an external power supply. That produces a 1mV drop for a 0.1 Ohms resistance. Since the measurement does not need to be extremely accurate, you just want to verify that all connections are in the 0.1 mOhm range and none are more than double that, you can suffice with pretty simple instrumentation that allows you to distinguish between 1 and 2 mV, while you send that approx 10 Amps through the connection, either by actually charging or with external means. You just need to take care to always probe on the same spot on the battery terminal (preferably as close as possible to the cell themselves, so the Alu or copper contact would be good if you can reach it, the alu nut around that contact would be the next best thing. Read up on 4-point resistance measurement (Kelvin sensing) if you are not familiar with how the sensing points will influence the measurement: http://www.allaboutcircuits.com/vol_1/chpt_8/9.html Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: cwa...@proxim.com Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
