Patent ID: 6414495
Filing Date: 2002-07-02
Classification: G01D

Abstract:
A method for generating an event marker from the periodic input voltage, Vin, received from a notch in the shaft of a rotating machine comprising the steps of:a) detecting and attenuating a positive peak in said periodic input voltage to produce a voltage Vinpk+/2; b) detecting and attenuating a negative peak in said periodic input voltage to produce a voltage Vinpkâˆ’/2; c) combining said produced voltages Vinpk+/2 and Vinpkâˆ’/2 to provide a bias cancelling voltage, Vbias as follows: Vbias=((Vin))/2+((Vin)pkâˆ’)/2; â€ƒand d) subtracting said bias cancelling voltage from said periodic input voltage to provide an output voltage representative of said event marker.