Electricity: measuring and testing – Magnetic – Displacement
Patent
1990-08-03
1992-04-07
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
Displacement
324161, G01B 730, G01P 356
Patent
active
051031710
ABSTRACT:
An adaptive revolution-measuring apparatus which includes a magnetic revolution sensor and an apparatus for comparing and evaluating the sensor signal of the revolution sensor to generate a digital output signal (U.sub.A) corresponding thereto, which despite large offset voltage tolerances and shifts uniquely identifies and evaluates the periodic sensor signal. The measuring apparatus contains a window comparator (17) with a controllable window as the apparatus for comparing which via at least one logic switching element (20, 21) drives a flip-flop (25) to produce the output signal (U.sub.A). Further apparatus are provided downstream of the window comparator which continuously generate corresponding reference voltages (U.sub.R1, U.sub.R2) for the window comparator as a function of the raised or lowered values of the sensor signal.
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Edmonds Warren S.
Franzblau Bernard
U.S. Philips Corporation
Wieder Kenneth A.
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