Hi David,

its not so funny for us, to waste time because you too lazy to tell your task so precise as needed. :-(

I assume "high accuracy" means 100ppm (0.01%) or better.

To measure very low resistance, the four-wire-method should be used. To eleminate the influence of thermo voltages AC measurement should be used.

But its unable to tell all these tricks used in a high cost professional equipment.
Also not only the schematic tell it. The selection of used devices, the real building of the pcb and of the whole gadget was important.
And also the software with its several error correction algorithm.


Peter