惠斯通电桥灵敏度的实验研究

The Experimental Investigations for Wheatstone Bridge′s Sensitivity

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.文章对惠斯通电桥的灵敏度进行实验研究.通过惠斯通电桥测电阻实验,获得了大量的实验数据,并给出电桥灵敏度Smax与比例臂r的关系.结果表明:电桥灵敏度Smax的增大随比例系数r而增大.这为用惠斯通电桥测电阻的选取实验参数、提高电阻的测量精度和获取最大灵敏度提供了依据,从而具有参考价值和可操作性.

Wheatstone bridge＇s sensitivity is regarded as a key factor to affect its measuring precision. The experimental investigations for the Wheatstone bridge＇s sensitivity were carried out in this paper. After carrying out Wheatstone bridge, plenty of observations were obtained and the relation between the maximum bridge sensitivity Smax and the proportional coefficient r. The result shows that bridge sensitivity Smax gradually increases as the ratio coefficient r increases. Therefore, it is important and maneuverable for us to choose the experimental parameters, to enhance the measured accuracy of electric resistance, and to obtain the largest sensitivity, which provide a reliable warrant for measuring the electric resistance using Wheatstone bridge.