利用零点定理进行电桥实验的平衡调节  

Balance Adjustment in Electrical Bridge Based on Zero-point Theorem

作　　者：宋瑞肖 陈寅 闫雨轩 SONG Rui-xiao;CHEN Yin;YAN Yuxuan(School of Information Engineering,Xi'an University,Xi'an Shanxi,710065,China;AVIC Shaanxi Dongfang Aviation Instrument Co.,Ltd.,Hanzhong 723102,China)

机构地区：[1]西安文理学院,信息工程学院,陕西西安710065 [2]陕西东方航空仪表有限责任公司,陕西汉中723102

出　　处：《内蒙古石油化工》2023年第8期15-17,44,共4页Inner Mongolia Petrochemical Industry

摘　　要：在大学物理实验中,电桥实验需要进行平衡调节,为避免调节过程中的盲目性,提出利用零点定理进行平衡调节,并以双臂电桥的调节为例,加以说明。首先,调节电桥桥臂的可变电阻为两个极值,观察检流计的光标偏转方向,当两个极值电阻对应的检流计偏转方向不同时,表明电路正常;接着,从电阻的最小值出发,逐步接近最大值,同时观察检流计光标的偏转方向,取当前档位光标偏转方向不改变的极大电阻,再进行下一档位的调节,依次调节电桥,使之平衡。该方法简单,调节速度快。而且该方法也可应用于其它的平衡调节中。In college physics experiments,there are some experiments that need balance adjustment.In order to avoid adjusting aimlessly,based on zero-point theorem,a new method of adjusting balance is in-troduced in this paper.This method is illustrated to take adjusting double bridge for an example.At first,the cursor deflection directions of galvanometer are observed as soon as the bridge arm resistance is modu-lated to the extreme values.If the extreme values are corresponding to different cursor deflection directions of galvanometer,the electrical circuit will be right.And then,beginning from the minimum resistance and gradually approaching the maximum value,at the same time,the cursor deflection directions of galvanom-eter are observed and the resistance is equal to the maximum value which make the cursor deflection direc-tion not change,then next tap position will be modulated one by one until the electrical bridge is in bal-ance.This method is simple and is used quickly.It also can be used in other ba lance adjustm ent.

关 键 词：零点定理 平衡调节 电桥 物理实验 电路 

分 类 号：O4-33[理学—物理]