Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1992-09-30
1995-06-13
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324538, 324639, G01R 3102, H01H 3104
Patent
active
054246334
ABSTRACT:
This application describes a method of testing for manufacturing faults and quality of unpopulated or inactive populated electronic printed circuit boards (PCB). This method can be used to develop a new contactless test system (CTS). An electromagnetic field is generated by an energizing plate connected to an AC signal. When a board under test (BUT) is placed within the electromagnetic field, perturbation of the original field by conducting elements on the BUT is solely a function of the geometrical layout of the conducting elements on the BUT. Therefore, measurement of the perturbed electromagnetic field produces a characteristic pattern for the BUT. Such a pattern can then be compared to a known pattern for the same type of board to determine whether the BUT is faulty (shorts or opens) or not faulty. The most distinctive feature of this method is that testing PCBs by this method requires no electrical contact with the BUT due to the use of the energizing plate.
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Ade Stanley G.
Advanced Test Technologies Inc.
Battison Adrian D.
Karlsen Ernest F.
Thrift Murray E.
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