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:
Aug. 27, 1991
Filed:
Mar. 14, 1989
John M Anholm, Jr, Snohomish, WA (US);
Gerald J McMorrow, Kirkland, WA (US);
John Fluke Mfg. Co., Inc., Everett, WA (US);
Abstract
A current sensing buffer 26 for driving a digital signal line of a unit under test 12 is composed of current mirror circuits in series with output switching transistors supplying test signals to the digital signal line. The current mirror circuits 66, 72 and 80, 84 generate sample currents corresponding to the magnitude of current through the respective drivers 68 and 78 to detect drive faults caused by bus or component failures. In buses comprised of several digital signal lines, one current sensing buffer 26 is used per line, and each curent sensing buffer 26 is controlled by a programmable circuit tester 10. The current sensing buffer 26 can be incorporated into an interface pod 14 which is substituted for a control component of a unit under test 12.