METHOD FOR AUTOMATED MEASUREMENT AND REGISTRATION OF ELECTRIC RESISTANCE OF SOLID AND LIQUID METAL AT TEMPERATURES FROM 0 TO 1000 0 C

摘要

Method for automated measurement and registration of electric resistance of solid and liquid metal at temperatures from 0 to 1000 °C is in fact that one connects four electrodes to sample of metal, where two current-exciting outer ones are connected to source of excitation of electric current and two inner current-collecting ones are connected to device intended for measurement of voltage, with measurement of voltage drop between current-collecting electrodes at direct current and with determination of electric resistance of sample. Direct current is generated by means of controlled stabilized source of direct current. Measurement of voltage drop between current-collecting electrodes one carries out with given time separation. At abrupt change of electric resistance one automatically changes value of direct current to provide constant respective accuracy of determination of resistance. The values of electric resistance obtained are registered in carrier of permanent memory.