piclist 1998\10\29\164807a >
Thread: Good way to measure resistance
www.piclist.com/techref/index.htm?key=good+way+measure
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face BY : Gabriel Gonzalez email (remove spam text)



Hi PICers,

What would be a good way to measure resistance (0 to 5 ohms) with 3 decimals
and get good accuracy +-0.001 ohm?

I discarded the A/D of a PIC 'cause it's only 8 bits, and intend to use 14
bits (at least), but I was thinking that I can use a lower bit count with
some kind of autoranging (maybe controlling a current source).

Another thing I am worried about is applying too much gain on an amplifier
(don't want to amplify noise).

Any suggestions to accomplish this?

TIA

Calvin

P.S.: All this will be controlled by a PIC obviously.

<002c01be037d$08bdbbc0$36cbe994@tgo> 7bit

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