提高惠斯通电桥灵敏度的方法

惠斯通电桥的灵敏度是影响其测量精确度的一个重要因素.为了分析影响惠斯通电桥灵敏度的因素,推导了惠斯通电桥灵敏度的公式,对惠斯通电桥的灵敏度进行实验研究.利用惠斯通电桥灵敏度的实验,从电源电压E、电源内阻rE和限流电阻RE、检流计灵敏度、检流计内阻RE和限流保护电阻R保护、检流计和电源接入线路的位置、R'E和桥路两端等效...

Methods of Improving Wheatstone Bridge's Sensitivity

Wheatstone bridge’ s sensitivity was regarded as a key factor to affect its measuring precision.In order to analyze influence factors of Wheatstone bridge’ sensitivity,expression of the electric bridge’s sensitivity was deduced.The experimental investigations for the Wheatstone bridge’s sensitivity were carried out in this paper.After carrying out the experiment,there are many factors that influence sensitivity of the electric bridge.There these factors are analyzed in the paper:supply voltage,internal resistance of supply voltage and current-limiting resistor,sensitivity of galvanometer,internal resistance of galvanometer and current-limiting protective resistor,on-position of galvanometer and supply circuit,relation between in the bridge and the equivalent resistance at the ends of the bridge,sum of resistances in bridge arms and ratio of resistance in corresponding bridgearm and,and so on.And then we derived the relation between the sensitivity and these factors by the experiment.From the analyses,we found methods of improving the sensitivity of electric bridge.