Post by thread:[OT] Good way to measure resistance

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.

At 13:45 1998-10-29 -0700, you wrote: >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? Both Maxim and Analog devices make great dual slope and multislope converters with 18 bit or more resolution, and full range input down to 1/2 volts or so. /Morgan Morgan Olsson ph +46(0)414 70741 MORGANS REGLERTEKNIK fax +46(0)414 70331 H€LLEKS (in A-Z letters: "HALLEKAS") SE-277 35 KIVIK, SWEDEN spam_OUTmrtTakeThisOuTiname.com ___________________________________________________________