Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1988-01-29
1989-06-20
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 73PC, 324133, 324537, G01R 104, G01R 3102
Patent
active
048412406
ABSTRACT:
A determination of whether each of a pair of interconnected nodes (22) on a circuit board (12) is connected to a corresponding one of a pair of nodes (28) on a translator board (14) via a test fixture pin (18) is had by coupling one of the translator board nodes to circuit ground. The other of the pair of nodes on the translator board is coupled to the gate of a field effect transistor (FET) (34) whose gate-to-source portion is shunted by a capacitor (38). The drain-to-source portion of the FET (34) is coupled in series with a resistor (36) between circuit ground and a voltage source supplying a potential below ground potential. When continuity exists between each of the pair of nodes (22 and 28) and each of the pair of pins (18), the FET(34) conducts, causing the voltage across the resistor (36) to change. By monitoring the voltage across the resistor (36), an indication can be had as to whether continuity exists.
REFERENCES:
patent: 3427534 (1969-02-01), Maxwell
patent: 4025850 (1977-05-01), Spiteri
patent: 4101826 (1978-07-01), Horsitmann
patent: 4289975 (1981-09-01), Rolfe
patent: 4292586 (1981-09-01), Longmuir et al.
patent: 4406985 (1983-09-01), Phillips et al.
patent: 4463310 (1984-07-01), Whitley
patent: 4503390 (1985-03-01), Wells, Jr.
patent: 4508405 (1985-04-01), Damon et al.
Hsue Ching-Wen
Lee Wha-Joon
American Telephone and Telegraph Company AT&T Bell Laboratories
Burns W.
Eisenzopf Reinhard J.
Levy Robert B.
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