Patent ID: 6369591
Filing Date: 2002-04-09
Classification: G01R

Abstract:
A tester for testing an electrical trace on a board capable of test without physically contacting the electrical trace comprising:a board having a first planar side and an opposing second planar side and an electrical trace formed on at least one planar side, said electrical trace having electrical continuity with both said first planar side and said second planar side; an electromagnetic source to direct a first beam of electromagnetic radiation on said first planar side to contact said electrical trace thereby producing a photoelectric effect thereon and to direct a second beam of electromagnetic radiation on said second planar side to contact said electrical trace thereby producing a photoelectric effect thereon; an electrode circuit including a first grid electrode disposed near said first planar side and a second grid electrode disposed near said second planar side; said electrode circuit for maintaining said electrode as a given potential for collecting electrons liberated by the photoelectric effect of the beams on the electrical trace; a meter for measuring photoelectric current between said electrode circuit and the electrical trace.