generally on vSENSE leads we just need to mitigate enough thermo-electric effect to get a reading that doesn't drift with saturation....when we do this in other devices, we generally use a highly stable wire, with proper terminations or joints. A lot of error can be induced into vSENSE leads, from poor terminations, and wire that drifts under load. It's really dependent on what kind of granularity the FW will contain. I am assuming the resolution is below 10 bit? on the a/d?