本刊2012年第9期“伏安法测电阻创新实验”(以下简称原文),围绕着如何减小伏安法测电阻实验中的系统误差,提出了作差法、等效替代法、还原法三种创新方法,有一定的实践指导意义.但笔者总觉有些方面未及本质或有些欠缺,特撰文说明和补充,不妥之处,望同行斧正.一、作差法的本质在伏安法测电阻实验中,电表的接法有图1甲、乙两种,如要消除电表影响,甲中需知电流表内阻,乙中需知电压表内阻,相关内容这里不再赘述.原文的例1原理如图2所示,S_2置a时,与图1甲电流表内接法相同,在图1甲中两表读数之比U/I=R+R_A,故 “Journal of Electrical Engineering” 2012 年 9 期 “” Volt-ampere Resistance Measurement Experiment "(hereinafter referred to as the original), around how to reduce the systematic error in voltammetry resistance measurement experiment, the proposed difference method, equivalent replacement method , Reduction method of three innovative methods, there is some practical guidance, but I always felt that some aspects of the essence or lack of some, special explanation and supplement, inappropriate, hope colleagues are positive. In the voltammetry resistance test, the meter connected to Figure 1 A, B two, in order to eliminate the meter effect, A need to know the ammeter resistance, B need to know the voltmeter resistance, the relevant content here no longer Repeat the original text of the principle of Example 1 shown in Figure 2, S_2 set a, with the same internal Figure A ammeter connection method, in Figure 1 A table two meter reading ratio U / I = R + R_A, so