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:
Dec. 13, 1994
Filed:
Mar. 27, 1992
Applicant:
Inventors:
Paul T Schreiber, Fort Worth, TX (US);
Douglas R Curtis, Los Gatos, CA (US);
Assignee:
Tandy Corporation, , TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 56 ; 361 91 ; 361119 ;
Abstract
A relatively large protection resistor is connected between the measurement in-out terminal and the internal circuitry of a digital multimeter. A clamping circuit at the input to the internal circuitry insures that any voltage applied to the input terminal will be dropped across the protection resistor, thereby avoiding an over-voltage condition which could damage the internal circuitry. A resistive divider network used to make measurements is connected between the protection resistor and the clamping circuit and is designed to take the protection resistor into account during measurements.