POTENTIOMETRIC RESISTANCE MEASURING SYSTEM

摘要

A system for measuring the resistance of a current-carrying inductive element comprises a pair of coupled, self-balancing potentiometers and an adjustable voltage delay circuit. One of the potentiometers is adapted for measuring the element voltage (after it is subjected to a predetermined time delay) by comparing it with a constant reference voltage. The other potentiometer is adapted for measuring the element resistance by comparing this measured element voltage with a voltage corresponding to the current through the element. The time delay introduced in the voltage measurement is chosen to delay voltage transients by a time equal to the inductive time lag of the element current, so that the resistance measurement is not significantly affected by such transients.