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用伏安法测电阻时,有两种可供选择的电路:图1所示的安培表内接电路和图2所示的安培表外接电路。在已知安培表内阻R_A、伏特表内阻R_V和待测电阻尺_X的大约阻值的条件下,为了使系统误差较小,怎样选择电路呢?本文通过对两种电路系统误差的分析,提出一个简便易行的方法。在图1所示电路中,安培表的示数是通过待测电阻的电流强度真值,伏特表的示数是待测电阻与安培表的电压之和;所以,采
When measuring the resistance by voltammetry, there are two alternative circuits: the ampere meter internal circuit shown in FIG. 1 and the ampere meter external circuit shown in FIG. 2 . Knowing that the internal resistance of the ampere meter R_A, the internal resistance of the voltmeter R_V, and the resistance value of the resistance gauge _X to be measured are smaller, how to select the circuit in order to make the system error smaller? Analysis, put forward a simple and easy way. In the circuit shown in Figure 1, the amperemeter shows the true value of the current through the resistance to be measured, and the voltmeter shows the sum of the voltage of the resistance to be measured and the ampere meter; therefore,