MEASURING DEVICE OF VOLTAGE/CURRENT CHARACTERISTICS

PURPOSE: To obtain a measuring device of voltage/current characteristics which suppresses a spike and an overshoot appearing in an output at the time of alteration of setting of a voltage/current to be supplied to an object of measurement and, besides, enables high-speed alteration of setting. CONSTITUTION: In a measuring device of voltage/current characteristics, a V- hold loop having a capacitor 1, an error amplifier 3, an FET switch 5, a voltage/current converter 7, an integrating means 41, a power amplifier 42, a current range resistance means 43 and a buffer amplifier 45 is provided. At the time of an ordinary operation, the FET switch 5 is turned ON and an output voltage is stored in the capacitor 1. At the time of alteration of setting of a voltage/ current, a feedback circuit of the V-hold loop is formed by turning the FET switch 5 OFF, the output voltage is maintained at a value just before the alteration by using the voltage of the capacitor 1 as a reference, a voltage value and a current value are altered in the meantime, the feedback circuit of the V-hold loop is cut off at the time point of completion of the alteration and the measuring device of voltage/current characteristics is restored to a state of the ordinary operation.