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:
Jan. 03, 1978
Filed:
Sep. 09, 1976
Applicant:
Inventors:
Gerhard Rumold, Bubenreuth, DT;
Georg Russ, Erlangen, DT;
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DT;
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ;
U.S. Cl.
CPC ...
324 51 ; 324 62 ;
Abstract
A measuring circuit for measuring the ground resistance of an ungrounded power circuit, particularly a d-c system supplied from a converter circuit in which a series circuit including an a-c voltage generator, a measuring resistor and a coupling member is connected between the object of the measurement and ground and an evaluation circuit including a phase sensitive rectifier circuit forms the unknown ground resistance by dividing the active component of the current driven by the generator voltage through the series circuit into the voltage between the measurement object and ground.