Patent ID: 6288552
Filing Date: 2001-09-11
Classification: G01R

Abstract:
An apparatus for detecting energization of individual electrical conductors of a plurality of generally parallel, adjacent electrical conductors, comprising:a magnetic sensor passed over the electrical conductors, the magnetic sensor generating an output signal in accordance with variation in the magnetic field as the sensor passes over the electrical conductors;a delay element, the delay element receiving the output signal and delaying the output signal for a predetermined period to define a delay signal;an adder, the adder determining the difference between the output signal and the delay signal to define a difference signal;a high window comparator, the high window comparator determining whether the difference signal is above a predetermined threshold and generating a high window signal in accordance therewith;a low window comparator, the low window comparator determining whether the difference signal is below a predetermined threshold and generating a low window signal in accordance therewith;a control circuit, the control circuit comparing the high window signal and the low window signal and generating an increment signal in accordance with the low and high window signals; anda counter receiving the increment signal, the counter incrementing in accordance with the increment signal.