AN AUTOMATED SETUP FOR MEASURING OF THE ELECTRICAL CONDUCTIVITY OF THE HIGH-RESISTANCE MATERIALS
The article describes an automated system for measuring the current-voltage characteristics of high-resistance materials with the range of the measured resistances to 10 <sup>15</sup> Ώ·sm. The setup allows the heating of the sample with a speed of 0.1-10 °C/min (accuracy of temperature measurement is not lower than 0.5 °C), the measuring of the current in the range of 10 <sup>-6</sup>-10 <sup>-12</sup>A and the changing of the voltage on the test sample in a range from 10 to 1000 V. The results of the temperature dependence study of the electrical conductivity of lithium niobate crystals are presented.