CURVE TRACER FOR ELECTROPHYSICAL STUDIES

A curve tracer for the analysis of the electrophysical properties of s uperconductors and related structures is described. The curve tracer c an record data in a triangle current scan. The output current range +/ -2 A is determined by the voltage-to-current converter. The control vo ltage parameters are amplitude +/-7.5 V, integral nonlinearity of the triangular voltage less-than-or-equal-to 0.03%, trigger spike amplitud e at the inflection points of the triangular voltage +/-350 mu V, asym metry between the rise and fall rates of scanning less-than-or-equal-t o 0.05%. The scan current has good temperature stability with respect to period and magnitude because only a single reference-voltage source is used. An arbitrary selected region of a characteristic can be scan ned both periodically and aperiodically.