by Kai Wendler, Roberto Roca Profet, Keil Gallinger, Kyle Coleman, Alessio Pollarolo
The accurate measurement of dc current from 1 A to 3000 A is of interest in many fields, including metrology, power generation, and multiple industries. Current measurement is often performed using Hall sensors, Anisotropic Magneto-Resistive (AMR) sensors, and dc resistance shunts. Each of these devices have limitations and all require calibration to provide traceable current measurements. This paper examines the difficulties encountered when making accurate current measurements using dc resistance shunts at currents up to 300 A. The shunt measurements are compared with measurements made using a direct current comparator transformer (DCCT) and the advantages in stabilization time, stability and reduced uncertainties are discussed.
