Patent ID: 9551761
Date: 2017-01-24
CPC Classifications: G01R

Claim:
1. A personal monitoring device comprising: a first magnetic field sensor aligned with an X axis coupled to first magnetic field signal conditioning circuitry for processing a first output signal from the first magnetic field sensor to obtain a first conditioned output signal; a second magnetic field sensor aligned with a Y axis coupled to second magnetic field signal conditioning circuitry for processing a second output signal from the second magnetic field sensor to obtain a second conditioned output signal; a third magnetic field sensor aligned with a Z axis coupled to third magnetic field signal conditioning circuitry for processing a third output signal from the third magnetic field sensor to obtain a third conditioned output signal; a comparator circuit coupled to the first magnetic signal conditioning circuitry, the second magnetic signal conditioning circuitry and the third magnetic signal conditioning circuitry for comparing the first conditioned output signal, the second conditioned output signal and the third conditioned output signal to a threshold magnetic field signal value; and an alarm coupled to the comparator circuit that is actuated when the first conditioned output signal, the second conditioned output signal or the third conditioned output signal exceeds the threshold magnetic field signal value.