On Dec 10, 2008, at 4:32 PM, Michael Algernon wrote: > http://us.fluke.com/usen/apps/PM/8846aapplication.htm?flukecmpgn=FPMb-12-10-08 > -------- Fluke 8846A Application > Situation: > Using two wires to measure resistance is convenient, but causes > measurement error. You can virtually eliminate this error by using > four leads and a multimeter with separate source and measure I don't quite understand their patent. I use a Ballantine milliohm meter at work, and it's a four-lead ohmmeter that terminates to two for measurement. Not complicated if the test instrument is designed to work that way. Joe -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist