The present magnetic field is applied, the more like non-destructive inspection (NDT Test, Non-Destructive) in mechanical maintenance task of hearing aids for persons with disabilities. The earthquake monitoring instruments and medical diagnosis by means of x-ray by electromagnetic wave (Magnetic Resonance Imaging, MRI), etc. Electrical equipment for power plants had an induced magnetic field used as many as generators (Generator), transformer or an electric motor vibration measuring instruments (Vibration) and the Solenoid Valve (SV), etc.Knowing the intensity of the magnetic field of the device makes it possible to forecast whether it still works correctly. The measure of the intensity of this magnetic field is created by using the properties of the event Hall (hall effect) appears by a recognized Hall (hall sensor) is an integrated circuit that produces voltage that is proportional to the magnetic field intensity in the vertical and when brought to the Hall with Volt recognition meter. And placed near a magnetic field, we know the intensity of the magnetic field in the area.
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