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:
Jun. 22, 1982
Filed:
Jun. 26, 1980
Applicant:
Inventors:
Shotaro Shindo, Musashino, JP;
Eiji Hayashi, Musashino, JP;
Assignee:
Yokogawa Electric Works, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 62 ; 324 54 ;
Abstract
An insulation resistance tester is provided having a logarithmic conversion circuit. A simple circuit arrangement is employed making use of a logarithmic relation between forward voltage and current of a semiconductor element, such as a diode, or a logarithmic relation between the voltage and current between the base and emitter of a transistor.