Method for measuring changes of magnetic resistance to e.g. measure electric current, involves changing inductance by influence factor so that direct voltage over non-linear oscillating circuit is changed

摘要

The method involves providing a frequency generator (G) with a non-linear oscillating circuit. Magnetic resistance of an inductor is changed by an influence factor i.e. external magnetic field, that displaces resonance characteristic so that direct voltage over the non-linear oscillating circuit is changed to represent a measurement for change of magnetic resistance. The inductor is comprised of a core made of a magnetic material i.e. ferrite, where the core has a hole for accommodating an X-Y-coil.