An Electronic Ratio Error Set for Current Transformer Calibrations

A direct-reading electronic ratio error set for currenttransformer calibrations is described. It is capable of generatingdirect and quadrature error currents from 1 ppm to 5 percent of| STANC1 MJULfSTANDARDtransformer secondary currents up to 10 A. The uncertainty is lessthan one percent of the generated current. The set features electronicdisplay of the direct and quadrature components with three digitseach and is direct reading at 50, 60, and 400 Hz.