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Measuring the heterogeneity of the cable "P5-8" was produced presumably since 1970. Designed to detect wave impedances inhomogeneities in cables, determine the distance to the defect. Measured distances: 0 ... 2000 m. Time delay range: 0 .... 20 μs. The minimum distance is 0.5 ... 0.6 m. Power supply from the AC network with a frequency of 50 Hz (400 Hz), voltage of 220 V or from the built-in power source (batteries), ensuring continuous operation for 3 hours. Power consumption: 20 VA from AC mains; 4 W from 12.6 V. The dimensions of the device are 125x245x270 mm. Weight 5.5 kg.