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:
Jul. 28, 1998
Filed:
Feb. 17, 1995
Moses Khazam, Lexington, MA (US);
Steven M Blumenau, Royalston, MA (US);
Genrad, Inc., Westford, MA (US);
Abstract
A method for testing for short circuits between UUT pins that are nominally connected to nodes on a circuit board which the UUT is mounted and open circuits between pins and nodes nominally connected thereto. The method is used in a system that responds to the capacitances between a plate positioned above the UUT and respective nodes to which the pins are connected. A group of pins are selected such that no two pins of the group are nominally connected together. The pins are connected together in the tester and if the capacitance between the plate and the pin group is less than a first threshold an open circuit is indicated. The presence of a short circuit is indicated by a capacitance greater than a second threshold that is greater than the first threshold.