Tagged Questions

4
votes
1answer
798 views

How does autoranging work in a multimeter? What is the circuit?

I was curious how this is done. It seems you would have to vary the voltage and current to measure resistance from 1ohm to 10Mohm.
1
vote
1answer
263 views

What's the low voltage displayed by a voltmeter when only one of its probes is connected?

Recently I was toying with a digital multimeter and observed the following. The multimeter was set to measuring AC voltage with the upper limit of 750 volts. It has two probes which I will call "red" ...
1
vote
1answer
512 views

Is there an Amp + Volt-meter on a chip or should I use the Arduino Analog?

I'm thinking of building a general purpose battery charger. It would charge LiPo packs, 9V, AA, AAA, etc... I've been doing a bit of Googling and read that the internal Phone charging circuits tend ...
3
votes
2answers
1k views

Circuit for testing LiPo batteries?

I have some lipo batteries I'd like to test. Ideally it would do the following: how much time does it take to discharge to minimum allowed voltage? how flat is the discharge curve? how many mAh ...