Low voltage continuity tester

Details Low voltage continuity tester Low voltage continuity tester

1985-09-20

1987-07-28

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324 62, 324 65R, G01R 3108

Patent

active

046834222

ABSTRACT:
A continuity tester specifically for tracing wiring and circuit paths on electronic printed circuit board assemblies that will not harm semiconductors or respond to resistances of more than a few ohms. The invention electronically divides the probe voltage down to less than 0.25 volts so that semiconductors cannot be biased into conduction when probed resulting in zero induced test current through them. A low impedance input responses to low resistance wiring continuity only, eliminating false responses that can be caused by measuring through a component. A grounding means is provided to prevent damage from static electric discharges by connecting the probes through a high value resistor to workstation ground.

REFERENCES:
patent: 3919631 (1975-11-01), Brown
patent: 4163937 (1979-08-01), Laass
patent: 4233560 (1980-11-01), Blenman
patent: 4580091 (1986-04-01), Robinson
Logan: "Test Probe . . . " Electronic Design--Feb. 1, 1977, p. 72.
Longborg: "Continuity/Isolation Checker"-JPL Report NPO-15632, Winter 1983.
Cockrum: "Analysis of a Diode-Protected Failure"--Electronic Test, May 1985--pp. 33-35.

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