This UM is a document certifying guaranteed by the manufacturer the basic parameters and technical characteristics of the сable fault locator TDR-TA4.7 (hereinafter the TDR-TA4.7). UM is intended for acquaintance with the TDR-TA4.7 device and the principle of operation and sets the operating rules, compliance with which maintains the device in constant readiness for action. TDR-TA4.7 is used for cables up to 256 km. It locates the most complicated and high impedance faults. It stores all the measurements in its internal memory. This device has a bank of commonly used cables uploaded for the best accuracy of location. TDR-TA4.7 is intended for the following measurements on power cable lines: cable length measurement and cable integrity tests; measurement of the distance to the heterogeneity of the cable impedance or low-resistance fault, using TDR method; measurement of the distance to the high-resistance fault, using the Arc Reflection Method (ARM) in complex with the high-voltage pulse generator (HVPG); measurement of the distance to the high-resistance fault, using the Impulse Current Method (ICM) or Decay Method in complex with the high-voltage pulse generator (HVPG); measurement of the velocity factor of the line at a known length.