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. 18, 1979
Filed:
Feb. 21, 1978
Applicant:
Inventor:
Richard P Davis, Carlisle, MA (US);
Assignee:
Teradyne, Inc., Boston, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 64 ; 324 62 ; 324 / ; 324 / ; 3241 / ; 3391 / ;
Abstract
Analyzing electrical circuit boards by providing a probe having at least two contact tips close enough to each other to simultaneously contact a lead of a mounted integrated circuit element, but spaced apart from each other sufficiently to permit measurement of electrical activity in the lead segment between the tips; and measuring the voltage drop between the tips resulting from the flow of test current through the resistance of the lead segment. In preferred embodiments the test current is injected directly into the lead through a third tip of the probe while the third tip is in contact with the lead at a point farther from the IC than the other two tips.