Turn-tester for windings with a magnetic core

A turn-tester for windings on a magnetic core is described. A temporary winding is wound on the core to form a current transformer. Based on the principle of current comparators for calibrating current transformers, the error of the current transformer thus formed is measured. The number of turns can be correctly determined from the characteristics of this current transformer. With an error of 2*10/sup -5/ , the accuracy of this type of turn testing is very high, especially for cores made of iron-nickel alloy. An error on the order of 0.1% to 0.01% is attainable, which means that an error of less than 1 turn is possible when the number of turns is less than 1000 to 10000.< >