Analyzing electrical circuit boards

Details Analyzing electrical circuit boards Analyzing electrical circuit boards

1978-02-24

1979-11-27

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 64, G01R 2702

Patent

active

041763130

ABSTRACT:
System for analyzing electrical circuit boards, featuring, in various aspects, determining first whether there is an active driver IC on a node by examining absolute values of internal IC resistance; second, if there is an active driver, whether there is an input circuit to internal supply voltage shorting resistance, by examining the ratio of the resistance R.sub.1 of one IC to the combined resistance R.sub.2 of the other ICs on the node; and third, if that type of shorting resistance is not found, whether other shorting resistances are present, by examining the difference between actual and expected node voltage.

REFERENCES:
patent: 3048776 (1962-08-01), Logan
Curtis et al., 4-Point Probe Measurement, IBM Technical Disclosure Bulletin, Nov. 1970, p. 1697.
Stetzler, Apparatus for Measuring Small Value Resistance, Western Electric Technical Digest, Oct. 1976, pp. 51 & 52.

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