On Sat, Jun 7, 2014 at 9:10 PM, Neal <nsed...@gmail.com> wrote: > On Sat, Jun 7, 2014 at 1:40 PM, Denis Heidtmann <denis.heidtm...@gmail.com> > wrote: > >> Galen suggested measuring the current through the intrusion jumper >> might help illuminate the random halts. I have measured that current >> as best I could. It appears to be about 0.1uA, the least count of my >> Fluke 87. >> >> I calculate that the CR2032 should last 250 years at this current, so >> I do not know why it is set so low. 10 uA would be too high, yielding >> only 2.5 years battery life. >> > > The battery drain is 0.1uA or the intrusion detect jumper is 0.1uA?
The latter. That comes from the battery when the computer is has no line power. > I would expect the battery current to be a lot closer to 10uA, but only > with the power supply AC cord unplugged or hard-switched off if your power > supply has a master switch on the back of it. With no AC, what does the 10 uA go to? The RTC and the BIOS memory plus anything else? So this means that I should be checking the battery every couple of years. (Unlike most on this list, I power off my machine when no one is using it, which is a significant part of the time.) > > With the computer running the battery current should be ~zero, and the > battery lasts whatever its shelf life is, probably ten years. Agreed. > > NealS -Denis _______________________________________________ PLUG mailing list PLUG@lists.pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug