Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1989-08-28
1992-02-11
Karlsen, Ernest F.
Electricity: measuring and testing
Plural, automatically sequential tests
324523, 324524, G01R 2714
Patent
active
050878743
ABSTRACT:
An apparatus can locate a short between a first and second network with a pair of probes, a measurement device and a current source. The measurement device can measure the potential between the probes. The current source can be connected to the first and second network for injecting between them a current in excess of 1/8 Amp. A larger system can use a matrix connected between a plurality of probes and the measurement device. The matrix can selectively connect a selected one of the probes to the measurement device. This larger system includes a manual keyboard for manually producing a command signal indicating selected pairs of the probes. A processor is coupled to the matrix and the manual keyboard for operting the matrix in response to the command signal to record the potential differences between selected pairs of the probes. A display can spatially display the selected pairs of probes and can also display the polarity of the potential between each of them, as measured by the measurement means. In using the forgoing apparatus one can predict the direction of a short between a first and second network in relation to the polarity between a pair of spaced points in the first network. Another prediction places the short as in a predicted direction where the magnitude of current appears to either increase or sharply fall toward zero.
REFERENCES:
patent: 3299351 (1967-01-01), Williams
patent: 3986116 (1976-10-01), Smith et al.
patent: 4377782 (1983-03-01), Metcalf et al.
Adams Thomas L.
Karlsen Ernest F.
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