FIELD: instrumentation. SUBSTANCE: invention refers to determination of technical condition of thyristors incorporated in rectification circuits of power supply sources. Magnetic field meter recording kinetics of outer magnetic field of induction elements which output is connected through amplifier to formers of logic signal is located near induction elements ( transformer, chokes of rejection or ripple filters ) which are parts of power supply source. Signal from outputs of formers is fed after amplifiers-converters to input of logic information processing unit connected to information display. EFFECT: reduced time of test. 2 dwg, 1 tbl
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