Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1997-08-15
1999-11-02
Ballato, Josie
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
G01R 3108
Patent
active
059777737
ABSTRACT:
A non-intrusive electrical cable tester determines the nature and location of a discontinuity in a cable through application of an oscillating signal to one end of the cable. The frequency of the oscillating signal is varied in increments until a minimum, close to zero voltage is measured at a signal injection point which is indicative of a minimum impedance at that point. The frequency of the test signal at which the minimum impedance occurs is then employed to determine the distance to the discontinuity by employing a formula which relates this distance to the signal frequency and the velocity factor of the cable. A numerically controlled oscillator is provided to generate the oscillating signal, and a microcontroller automatically controls operation of the cable tester to make the desired measurements and display the results. The device is contained in a portable housing which may be hand held to facilitate convenient use of the device in difficult to access locations.
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Medelius Pedro J.
Simpson Howard J.
Ballato Josie
Borda Gary G.
Sundaram T. R.
The United States of America as represented by the Administrator
Vrioni Beth A.
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