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The Universal Measuring Bridge "UM-3" from I quarter of 1957 produced the Velikiy Luki Radio Plant. Since 1963, the universal measuring bridge "E12-2" produced the Leningrad plant "Meter". Both devices are similar. The universal measuring bridge '' UM-3 '' subsequently '' E12-2 '' is designed to measure resistances at direct current, capacitances, tangents of coal losses, inductances and Q-factors of coils at frequencies of 100 and 100 Hz. When using an external generator, coil measurements can be made at other frequencies. Read more about the device below.