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:
May. 08, 1979
Filed:
Oct. 11, 1977
Applicant:
Inventor:
Earl A Grindheim, Minneapolis, MN (US);
Assignee:
Rosemount Inc., Eden Prairie, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ; 73 37 ; 361283 ;
Abstract
A digital output capacitive transducer wherein two capacitors are used, one providing a reference current and the other providing a varying signal current. The signal current is obtained from an oscillator through a capacitor, which varies in capacitance as a function of the parameter to be measured. The reference current offsets the signal current to attain a known relationship between the sampled parameter and the signal current. The circuit has a small number of components and operates on a relatively low voltage with an accurate digital output.