Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1986-10-02
1988-09-13
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Plural, automatically sequential tests
2504841, 324158F, G01R 3102
Patent
active
047712309
ABSTRACT:
A method and system for the electrical and electro-optical inspection and testing of unpopulated electronic printed circuit boards, ceramic substrates and other like items which have conductive pathways formed thereon, vias, through-connectors and other interconnected conducting surfaces. The item under test is placed within a sealable gastight chamber filled with an ionizable gaseous atmosphere, such as argon, at low pressure. An electro-luminescent gas plasma discharge is produced within the chamber between a grid placed either over or below the item under test by application of a positive polarity potential to the grid and selective application of a constant current negative potential to particular test points on the item to be tested via a computer controlled movable probe. In one embodiment of the invention, the resulting electro-luminescent gas plasma discharge resistance is measured and compared by a computer to a standard resistance value for the particular item under control at a particular setting of the movable probe as a measure of the conductivity characteristics of the item under test. Other embodiments of the invention, may also include computer controlled electro-optic scanning of the surfaces of the item under test by a scanning photometer detector. The output from the scanning photometer detector is supplied to a computer for comparison to a standard prestored in the computer from a previously tested good board or substrate. The two techniques may be combined in a single system which can inspect either one or both sides of a test circuit board or substrate.
REFERENCES:
patent: 3044007 (1962-07-01), Akers
patent: 3436651 (1969-04-01), Helms et al.
patent: 3559190 (1971-01-01), Bitzer et al.
patent: 3991302 (1976-11-01), Danner
patent: 4104696 (1978-08-01), Cochran, Jr.
patent: 4335420 (1982-06-01), Mitsuo et al.
patent: 4507605 (1985-03-01), Geisel
patent: 4527119 (1985-07-01), Rogers et al.
patent: 4600878 (1986-07-01), Doemens et al.
Burns W.
Eisenzopf Reinhard J.
Helzer Charles W.
Testamatic Corporation
LandOfFree
Electro-luminescent method and testing system for unpopulated pr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electro-luminescent method and testing system for unpopulated pr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro-luminescent method and testing system for unpopulated pr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-808247