Measuring and testing – Instrument proving or calibrating – Dynamometer
Patent
1996-10-02
1998-03-31
Williams, Hezron E.
Measuring and testing
Instrument proving or calibrating
Dynamometer
73 138, 7351434, G01L 2500, G01P 1509
Patent
active
057340870
ABSTRACT:
An acceleration sensor includes a piezoelectric ceramic element (1) for detecting acceleration, a signal processing circuit (2) for processing an output signal received from the piezoelectric ceramic element (1), and a self-diagnosing circuit (20) which is connected in series with the piezoelectric ceramic element (1). The self-diagnosing circuit (20) is provided with a PNP transistor having an emitter (E) which is connected to a source voltage V.sub.cc, a base which is supplied with an externally inputted timing pulse signal, and a collector for outputting a failure diagnosing signal which is synchronized with the timing pulse signal. Further, a self-diagnosing capacitor (25) is provided between the collector of the PNP transistor (23) and the piezoelectric ceramic element (1).
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Moller Richard A.
Murata Manufacturing Co. Ltd.
Williams Hezron E.
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