maemo.org - Talk - View Single Post - [SFOS] Bettery voltage reported by "Btry" does not match as measured by Multimeter.

	pichlo	2017-02-27 , 16:01
	Posts: 6,445 \| Thanked: 20,981 times \| Joined on Sep 2012 @ UK	#8

Originally Posted by juiceme

Ahh, so you measure the battery separately before connecting to phone!?

THAT seems to be the right question. I had not even considered that possibility, knowing that it would obviously give different results.

Originally Posted by juiceme

The right way to do it is to have an integrating measurement, where a capacitor is repeatedly charged and discharged through a resistance and the cycle time is measured. Just about all DMM's use this method.

I always considered the integrating method a fudge, to replace an expensive 12 or 16 bit ADC with a cheap comparator and a counter. But now you mention it, it does have some advantages too

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