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:
Oct. 13, 1981
Filed:
Dec. 04, 1979
Applicant:
Inventor:
Jorma Ponkala, Helsinki, FI;
Assignee:
Vaisala Oy, , FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ; 324 / ; 324120 ; 34087037 ;
Abstract
The output of each of a plurality of CMOS inverting amplifiers is connected to a corresponding one of a plurality of impedances to be measured. A stepping circuit is connected to the inputs of the amplifiers. A voltage supply is connected to the amplifiers and provides a signal to be measured which is directed via a corresponding one of the amplifiers to an impedance measuring circuit connected to the impedances to be measured in common. The impedance measuring circuit produces an output impedance proportional to the impedances to be measured.