Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1993-02-04
1995-04-11
Karlsen, Ernest F.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324501, G01R 3128
Patent
active
054062098
ABSTRACT:
In methods and apparatus for non-contact testing of an electronic circuit board at least one electromagnetic emission sensing probe is disposed a short distance from a circuit board under test, the circuit board is operated while sensing electromagnetic emission from a region of the circuit board near the probe, and a time domain representation of the sensed electromagnetic emission is developed. The time domain representation of the sensed electromagnetic emission is compared to a time domain representation of electromagnetic emission of a circuit board known to be operating properly. Preferably, an array of electric field sensing probes is used to sense emissions from several regions of the circuit board simultaneously, and time domain representations of the sensed electromagnetic emissions are simultaneously developed and compared to respective time domain representations of electromagnetic emissions from circuit boards known to be operating properly.
REFERENCES:
patent: 3463007 (1969-08-01), Jones et al.
patent: 4583042 (1986-04-01), Riemer
patent: 5006788 (1991-04-01), Goulette et al.
patent: 5148102 (1992-09-01), Rose et al.
patent: 5218294 (1993-06-01), Soiferman
Goulette Richard R.
Johnson Nigel P.
Leonida Dan
Xavier Stanislus K.
Junkin C. W.
Karlsen Ernest F.
Northern Telecom Limited
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