伏安法测电阻是测量电阻值的常用方法。但是,不论是采取安培表内接法还是外接法,由于安培表和伏特表在测试电路中不可避免地要分流分压,从而改变被测电路的状态,产生系统误差。如何减小或消除电压表、电流表内阻的影响,获得准确的测量值?首先,我们要对伏安法测电阻产生误差的原 Volt-ampere resistance is a common method of measuring resistance. However, regardless of whether the ammeter is connected internally or externally, the ammeter and the voltmeter must inevitably be shunted in the test circuit to change the state of the circuit under test, resulting in systematic errors. How to reduce or eliminate the influence of internal resistance of voltmeter and ammeter and obtain accurate measurement value? First of all, we need to measure the resistance of the voltmeter method to generate the error.