[en] Using on-line system, one investigates the effect of low-temperaturre (up to 4.2 K) cooling on magnetic properties of electrotechnical steel samples. Dependence of hysteresis losses in proper cycles of reverse magnetization with values of magnetic induction in a sample, which reach saturation induction, is studied. Application of the system allows to carry out routine monitoring of magnetic characteristics of different steels and to choose the most fitting one for application as a superconducting-dipole yoke of the IHEP accelerating storage complex. The system includes the 100 W programmable bipolar current source, analogue integrator, programmable timer and reference voltage generator, two-channel programmable amplifier, two bipolar 12-th bit ADC with 4K memory buffer, SUMMA interface and microcomputer CM-4