Two-stage inductive voltage dividers

The paper examines the theory of the 2-stage voltage transformer and shows that it not only provides a very accurate primary/secondary voltage ratio but also increases the effective input impedance of one of its primary windings to a very high value. It is shown theoretically and experimentally that these characteristics enable inductive voltage dividers to be made which have extremely small errors of voltage division within individual decades and in which the errors due to interconnecting the decades are virtually eliminated. Single-decade dividers having in-phase errors of less than 5 parts in 109 of the input over the frequency band 40¿400 Hz have been constructed.