一、引言用电桥测量四端电阻之所以有困难,不仅是由于电位引线上流有电流,而且还因为连接未知电阻与标准电位点的跨接片本身有电阻。电位引线的电流问题可通过辅助桥路平衡方法来解决,而开尔文所提出的在跨接片二端附加接一对比率臂的方法足以补偿跨接片电阻的影 I. INTRODUCTION The difficulty of measuring the four-terminal resistance with a bridge is not only because of the current flowing through the potential leads, but also because of the resistance of the jumper connecting the unknown resistance to the standard potential. The problem of the current in the potential leads can be solved by the Auxiliary Bridge Balance Method, and the method proposed by Kelvin to add a contrast ratio arm at both ends of the jumper is sufficient to compensate for the jumper resistance