505 UTEC it is intended for testing the technical parameters of the current transformers and voltage without de-energizing them. Instrument makes it possible to measure the admittance, the transformation ratio, the phase shift of the currents of primary and secondary windings, the current and the voltage. So it can determine the full-load saturation curves of the secondary winding of transformer and produce the demagnetization of wires. Instrument measures the current of the primary winding from 10 to 3000[A], second from 0,1 to 10[A], stress from 10 to 600[V] instrument feeds by alternating voltage from 10 to 530[V] or from the built-in storage battery, has 4[kh] small 40[razryadnyy] display. Instrument has a built-in memory and a connection for the sake of the computer.