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:
Feb. 04, 1992
Filed:
Feb. 22, 1991
Applicant:
Inventors:
Hideki Wakamatsu, Tokyo, JP;
Shinya Goto, Tokyo, JP;
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324605 ; 324650 ; 324613 ; 330149 ;
Abstract
The circuit element being measured is connected to a signal source, a volt meter, a zero detection amplifier and a voltage controlled current source for drawing an electric current through the device to be measured in accordance with the output of the zero detection amplifier. Means are provided for changing the operating point of the zero detection amplifier in response to a measuring condition of the apparatus.