Current comparators - a new class of transformer-like devices

The merits of the inductive voltage divider are well known in the field of voltage measurement. Current comparators are analogous devices; they are highly accurate current transformers which can measure the ratio of two currents with an uncertainty ol better than one part in 106. Furthermore, this high accuracy is built in, being provided by the turns ratio. D.C. as well as a.c. measurements are possible.