Apparatus for measuring the number of turns of a toroidal coil

摘要

Apparatus for measuring the number of turns on a toroidal coil includes a conductive member adapted to receive the coil to be tested; circuitry for energizing the coil to be tested including an oscillator and coupler circuitry connected in circuit between the oscillator and the coil energizing terminals; and circuitry connected to the conductive member including a comparator having first and second inputs and an output. Circuitry responsive to the connection of the conductor member in circuit applies a reference voltage signal to a first input of the comparator; circuitry responsive to the voltage induced in the conductive member by the energized toroidal coil to be tested applies a signal proportional to the induced voltage to the second input of the comparator; and circuitry responsive to the output of the comparator stabilizes the voltage applied from the oscillator to the toroidal coil when the input signals to the comparator are equal. An output device responsive to the voltage applied to the toroidal coil provides an output indicative of a number of turns on the coil under test.