摘要
应用基尔霍夫定律,推导出开尔文电桥非平衡时流过检流计的电流表达式,同时分析了影响开尔文电桥灵敏度的主要因素有:工作电流;所用检流计的灵敏度、内阻;各桥臂上的电阻;比例臂系数等,进而得出开尔文电桥灵敏度达到最大值的条件。
Based on the Kirchhoff ＂s law, we deduce the Kelvin bridge unbalanced expression of the current through the galvanometer, then analyze the influencing factors of Kelvin electric bridge sensitiv- ity, these are working current, the galvanometer sensitivity and resistance, the resistance of each bridge arm, and the arm ratio coefficient. At last, we derive the requirement of the maximum sensitivi- ty.
出处
《实验室科学》
2012年第3期101-103,共3页
Laboratory Science
关键词
开尔文电桥
灵敏度
电阻
Kelvin bridge
sensitivity
resistance
