电压表内阻对测试电路影响一例分析

Effect of Internal Resistance of Voltmeter on Measuring Electric Circuit——A Case Analysis

由单管放大电路实验分析电压表内阻对放大电路的影响．内阻越大，对电路影响越小．当电压表内阻较小而不能忽略时，就应对测量结果加以修正．

In this article,through an experiment on a single tube magnified circuit,the author analyses the effect of internal resistance of voltmeter on the magnified circuit being measured,coming to the conclusion that the greater the resistance is,the less it will affect the circuit.When the internal resistance of voltmeter is so small that we can not neglect its effect,we have to modify our measuring results in order not to draw incorrect conclusions.