A fully automated precise electrical resistance measurement system

A fully automated precise electrical resistance measurement system for more than one sample has been constructed. Conventional four‐probe measurements with van der Pauw and Montgomery configurations are possible with this system. Resistance measurements in the range of a few μΩ to a few GΩ are possible for six samples at a time from room temperature down to liquid‐helium or liquid‐nitrogen temperatures with a temperature control accuracy of better than 10 mK. The design features of the system with special reference to the low‐noise switching methods of currents and voltages are described in detail. Precision of the results thus obtained using this system are highlighted for a few superconducting and semiconducting samples.