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The AC compensator "K-509" has been produced since 1978. Designed to measure the orthogonal components of the parameters of linear electrical circuits at frequencies from 40 to 10,000 Hz by comparing the voltages on the elements of these circuits with a compensating voltage generated by the in-phase and quadrature measuring circuits of the compensator. The value of the operating current is 0.5 A and the corresponding final values "‹"‹of the compensating voltage limits of each measuring circuit are 161.1 and 1611 mV. The normal values "‹"‹of the input voltage of the voltage divider is 1.5; 3; 7.5; 15; thirty; 75; 150; 300; 600 V, the nominal value of the current divider 1.5 mA. Normal operating frequency frequency: 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 50; 51; 52; 53; 54; 55; 56; 57; 58; 59; 60; 100; 150; 200; 400; 1000; 2000; 4000; 10,000 Hz. Note. At frequencies from 100 to 10000 Hz, use a null indicator, a voltage divider and an ammeter corresponding to the required frequency range and not included in the package. The overall dimensions of each of the measuring blocks K516 and K517 and does not exceed 490x386x 210 mm, transformer I57 120x230x190 mm. The mass of the K516 in-phase circuit unit is 12 kg, the K517 quadrature circuit unit is 14 kg, the I57 transformer is 6 kg.