论文部分内容阅读
一、电表(电压表、电流表)的双重作用伏安法测电阻的实验中,安培表是外接还是内接是有条件的,即当电压表内阻R_V远大于待测电阻Rx时,安培表外接;当安培表内阻R_A远小于待测电阻Rx时,安培表内接。安培表不论内接还是外接,实验中都会存在误差,我们称为系统误差。电表内阻给定时,电表具有双重作用,即可作为定值电阻使用,来分压限流,又可作为测量仪器使用,测电压、电流,由电压表的读数可求出流过电压表
First, the dual function of the meter (voltmeter, ammeter) Voltammetry resistance test, the ammeter is external or internal conditions are qualified, that is, when the voltage meter internal resistance R_V much larger than the resistance to be measured when the ammeter External; when the ammeter R_A resistance is much smaller than the resistance to be measured Rx, the amp meter connected. Whether the internal or external ammeter table, the experiment there will be errors, we call the system error. Ammeter resistance given, the meter has a dual role, that can be used as a fixed value resistor to divide the current limit, but also as a measuring instrument to use, measuring voltage and current, the voltmeter readings can be obtained through the voltmeter