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读了《物理教学》1987年第6期刊登的《精测电流表内阻的简易方法》一文(以下称《精测》一文),笔者觉有偏颇,不敢苟同,特与黎宗传同志商榷。《精测》一文认为,在高中物理甲种本第二册275页所设置的“把电流表改装为伏特表”的学生实验中所介绍的测定电流表内电阻的方法(即“半偏法”),由于实验原理不完善和测试方法粗略带来的系统误差竟达10%左右,还说甚至会产生更大的误差。笔者认为,这种对“半偏法”在一定程度上的否定是不恰当的。作者接着又提出:如何消除或减小上述实验的系统误差呢?但后文并没有提出消除或减小“半偏法”实验误差的途径,而是另外提出了方法一和方法二(见原文图2和图3)。笔者认为,
After reading the article “Simple Method for Measuring the Internal Resistance of the Ammeter” published in “Physics Education” No. 6 in 1987 (hereinafter referred to as “fine measurement”), the author felt biased and disagreed, and discussed with Comrade Li Zongchuan. In the article “Accurate Survey”, the method of measuring the internal resistance of an ammeter described in the student experiment of “converting an ammeter to a voltmeter” set in the 275th book of the second edition of the senior high school physics class (that is, semi-bias The law “), due to the imperfect experimental principle and the coarseness of the test method, can lead to a system error of about 10%. It also says that even larger errors will occur. The author believes that this negation of the ”half partial method“ to a certain extent is inappropriate. The author then proposes: How to eliminate or reduce the systematic errors of the above experiments? However, there is no way to eliminate or reduce the experimental error of ”half partial method" but to propose methods 1 and 2 ( See original figure 2 and figure 3). the author thinks,