何震,贺六连,曹文

• 1:大庆石油学院务处 ,大庆石油学院科研处 ,大庆石油学院基础处

摘要：

惠斯通电桥灵敏度与检流计灵敏度及电源电压有关,但这要受到设备的条件限制。而电桥各桥臂电阻的选择,也要影响电桥灵敏度。本文通过理论推导并用实验验证,当桥臂电阻R_1=R_x(实际上数量级相当即可)时,减小R_2阻值,可以提高电桥的灵敏度。

关键词： 惠斯通电桥;灵敏度;桥臂电阻

Abstract: Thesensibility of Wheatstone bridge depends on the sensibility of cure-rent detector, the voltage applied and the values of the resistance in th-arms. The former ones are limited by the equipment available. The later enaebles us to improve the sensibility by choosing the value of resistance. Wfind that the sensibility will be greatly improved, if we take R_1≈R_Xand a small value of R_2.

Keywords: Wheatstone bridge;sensitivity analysis;resistance in the bridge arms

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参考文献：

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• [2] 李继凡,罗远瑜等,《精密电气测量》哈尔滨工业大学P332～P336
• [3] 《物理实验,基础部分(工科用)》P94