Development of a simple and low cost magnetic field measurement equipment up to 400 kHz

In this paper the design, realization and operative ratings of a new simple and low cost magnetic field measurement equipment in the frequency range from 10 Hz to 400 kHz are reported. The design specifications of this device have been chosen following the indications given for the magnetic field reference sensor in Standard EN 50366, concerning emissions of household and similar electrical appliances with reference to human exposure to electromagnetic fields. The developed equipment consists of three mutually perpendicular concentric coils, each one of two turns, for magnetic field analysis up to 400 kHz. By using operational amplifiers, an electronic elaboration of the coil signals has been done and is described. The characterization of the equipment has been performed by using a laboratory set-up, where the test magnetic field configuration has been obtained with a single layer solenoid in house developed.