Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1998-02-24
2000-11-21
Metjahic, Safet
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324756, 324761, 324537, 324500, G01R 3100, G01R 3102, H01H 3102
Patent
active
061508276
ABSTRACT:
An automatic adjustment method is described for elimination of the centering error during the electrical test on printed circuit boards, in particular SMT (surface mounting technology) printed circuit boards, in which metal surface bump contacts or pads are used for connection of the components to the PCB. The method includes the step of associating each pad of a centering profile by a function .rho.=f(.theta.). An electrical test is performed which classifies the pads as open and okay. The .rho..sub.max and .rho..sub.min curves are determined corresponding to a lower envelope of the centering profiles of the pads found to have no errors of open circuit and an upper envelope of the centering profiles of the pads found to have an error of open circuit, respectively. A zone A is determined of possible displacements to the test needles with respect to the nominal points of contact between needles and pads. An optimal correction .rho..sub.opt and .theta..sub.opt is determined. A control means is operated to carry out this optimal correction.
REFERENCES:
patent: 5065092 (1991-11-01), Sigler
patent: 5381104 (1995-01-01), Kimura et al.
patent: 5523698 (1996-06-01), Antonello et al.
patent: 5574668 (1996-11-01), Beaty
patent: 5614819 (1997-03-01), Nucci
Antonello Gianpaolo
Bagioni Graziano
Pavoni Giovanni
Circuit Line SPA
Hollington Jermela M.
Metjahic Safet
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