(四) 計算機串行接口The test apparatus is according to the national standard GB3048.2 - 2007provisions of the successful development of the, is the latest installment ofdetermination of metal conductor resistance performance of wire and cable,its performance meets the requirements of GB3048.2 2007 technology, is anew inligent electronic technology, micro processor, automatic detection technology and a new type of sample clamping device in one of the high-tech technology products, to solve the resulting from unilateral double arm bridge traditional detection in the complicated operation, balance time,artificial calculation, work efficiency is low, the current high precision voltageadvanced down four terminal measuring method, eliminating the error caused by connecting wire resistance and contact resistance, high precisiondetermination of solid copper or aluminium and its alloy conductor volume resistivity, the quality of resistivity and resistance per unit length.