FIELD: educational aids for colleges and universities. SUBSTANCE: device has shared switch, ammeter, and measuring coil, as well as n coils and switches which are connected in series and in parallel current source through serial circuit of shared switch and ammeter. In addition device has serial circuit of direct current amplifier, peak detector and voltage detector. Measuring coil which is connected to n inductance coils inductively, is connected to input of direct current amplifier. EFFECT: increased functional capabilities. 5 dwg
