David Alan Devine

US Patent:

42824796, Aug 4, 1981

Filed:

Aug 24, 1979

Appl. No.:

6/069485

Inventors:

Gordon J. Deboo - Sunnyvale CA
David J. Devine - San Jose CA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

G01R 3102

US Classification:

324 51

Abstract:

A test apparatus for locating electrical shorts that is especially suited for use while an electrical circuit is being fabricated or assembled. A ring counter derives input pulses from a squarewave oscillator. The outputs of the counter are fed through transistors to an array of light emitting diodes. Each diode is connected to an electrical conductor, such as a bus bar, that is to be tested. In the absence of a short between two electrical conductors the diodes are sequentially illuminated. When a short occurs, a comparator/multivibrator circuit triggers an alarm and stops the oscillator and the sequential energization of the diodes. The two diodes that remain illuminated identify the electrical conductors that are shorted.

US Patent:

D331950, Sep 5, 1989

Filed:

Nov 7, 1986

Appl. No.:

6/928292

Inventors:

David Devine - Orange CA

US Classification:

D 7 5