论文部分内容阅读
用惠斯通电桥测电阻的原理如图1,电桥平衡时下式成立 (1)应用合分比原理可进一步得到 (2) 由于导线电阻和接触电阻的存在,给测量带来很大误差,尤其是测量低电阻时(低电阻用双电桥),误差更大。为了消除导线电阻和接触电阻给测量带来的误差,我们利用电桥的多次平衡法测量,
The principle of measuring the resistance with a Wheatstone bridge is shown in Fig. 1. When the bridge is balanced, the following equation is established: (1) The application of the combination ratio principle can be further obtained. (2) Due to the presence of wire resistance and contact resistance, it brings a great error to the measurement. Especially when measuring low resistance (double bridge with low resistance), the error is even greater. In order to eliminate the errors caused by the wire resistance and the contact resistance, we use the bridge’s multiple balancing method to measure