Abstract: An electronic circuit for demagnetizing ferromagnetic material includes a voltage source and a conductor loop connected thereto, a demagnetizing resonant circuit is arranged in the conductor loop for forming a decaying alternating magnetic field. In the conductor loop, a resonant circuit battery switch is arranged in series with the demagnetizing resonant circuit, and a recharge resonant circuit for pulsed recharging of a charging current into the demagnetizing resonant circuit is arranged in parallel with the demagnetizing resonant circuit and with the resonant circuit battery switch. A recharge store which is arranged in parallel with the voltage source, with the recharge resonant circuit and with the demagnetizing resonant circuit, as well as a recharge switch for interrupting a charging current from the recharge store are located in the conductor loop. The circuit can be operated by a controller for controlling the voltage source and all switches.

Abstract: A method and apparatus for measuring magnetic fields with a magnetically sensitive probe which is introduced into a magnetic field and which transmits a measuring signal to a measuring device for evaluation. After activating the measuring device, a zero point is measured and automatically set and a correction value is calculated and stored. The probe is introduced into the magnetic field and the polarity of the magnetic field automatically determined. A peak value of a plurality of measured values is automatically stored and the measurement range of the device is automatically adjusted to the range of the magnetic field. Thereafter, the measured values are read out, the probe is removed from the magnetic field and the device is switched off.