The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1989
Filed:
Aug. 05, 1987
Naoyuki Matsumoto, Kyoto, JP;
Horiba, Ltd., Minami, JP;
Abstract
A processing circuit for use with DC-voltage-output type sensors comprising: a preamplifier; an automatic polarity-switching means coupled to the sensor and the preamplifier for switching the connection condition between a non-polarity-inversion condition and a polarity-inversion condition; and a controlling-measuring means for controlling the automatic polarity-switching means in carrying out the switching alternately between the non-polarity-inversion condition and the polarity-inversion condition, and for measuring the difference between the output of the preamplifier under the non-polarity-inversion condition and the output of the preamplifier under the polarity-inversion condition, thereby cancelling the effects of the input offset voltage of the preamplifier and the offset voltage of the preamplifier and the offset voltage generated by the input bias current and the resistance of said DC-voltage-output type sensor.