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The DC bridge "MVU-49" has been produced since 1950. The bridge is designed to determine the nature and location of damage in overhead and cable lines and to measure resistance on direct current from 10 to 100,000 ohms with an error of ± 0.2%. The device allows you to make the following types of measurements and tests: Measurement of resistance at a constant current. Determining the nature of damage to the air or cable lines: earth fault; circuit between wires. Determination of the asymmetry of the wires. Determining the location of the circuit of one wire to earth: by the method of three measurements; by loop method; according to the method of three wires. Determining the location of a short circuit between the wires to the ground. Determination of short circuit between wires. Identification of the place of break of the four-wire cable. Determining the location of the wire breakage overhead lines. In addition, it is possible: using the bridge comparison arm as a resistance store; using the internal galvanometer of the bridge separately as a zero instrument.