Physical parameter sensor having a self-testing circuit which re

Details Physical parameter sensor having a self-testing circuit which re Physical parameter sensor having a self-testing circuit which re

1998-02-27

2000-10-24

Patidar, Jay

Electricity: measuring and testing

Electrical speed measuring

32420712, 327 42, 327 4, G01P 348

Patent

active

061372870

ABSTRACT:
A sensor for detecting a physical parameter is capable of detecting an error state in which normal physical parameter detection is not possible even though the output voltage is within a normal output voltage range is disclosed. Errors such as a normal reference frequency signal not being output from an oscillation circuit for some reason, or the frequency of the reference frequency signal output from the oscillation circuit not being within a particular frequency range, can occur. The physical parameter sensor of the invention comprises a self-testing circuit for detecting such error states, and outputting a signal indicating such error detection.

REFERENCES:
patent: 5686835 (1997-11-01), Watanabe et al.
patent: 5736852 (1998-04-01), Pattantyus

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