| 摘要 |
Circuitry, and associated methodology, for locating resistive shunt faults on a cable pair comprises DC source (120) and current sensors (121,122) which provide measured information utilized to estimate the resistance of the pair between the fault and a test position. In locating faults of a single-sided nature, two sets of measurements, either absolute or ratio type, are effected from the test position with the pair shorted at a point beyond the fault. In locating double-sided faults, three sets of current dependent measurements are taken at the measurement point. A reference pair is required for double-sided faults, and various strapping arrangements between the pair under test and the reference pair are required at a point beyond the fault depending on the required set of measurements.
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