Personal computer-based data acquisition system designed to perform elctrical transport characterization of high-Tc superconductors is presented. This system can measure the temperature dependence of the resistance. Four point ac method is adoped to e...
Personal computer-based data acquisition system designed to perform elctrical transport characterization of high-Tc superconductors is presented. This system can measure the temperature dependence of the resistance. Four point ac method is adoped to eliminate the effects of contact resistance and thermal volatge. The temperature is measured by copper-constantan thermocouple with resolution and accuracy of 0.1 K and ± 0.6 K, respectively, which are the limit of c-c couple. And method of couple-EMF to temperature converting is presented. The system can be easily modified to measure the critical current of the superconductor.