This speed sensor has a magnet, an electric circuit board, and a hall element.
1. Is static/A.C magnetism around the environment.
2. The voltage spike that is induced as a magnetic field from the reluctor comes into closer contact with the steel poles.
3. As the reluctor points get farther away from the steel poles the magnetism decreases & voltage decreases too.
The shape of the wave form is also a good indicator of what the shape of the reluctors teeth are like.
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