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众所周知,运用伏安法测电阻值有两种电路,即安培表外接法与内接法。为了减小测量的系统误差,提高测量的精度,在待测电阻值较小时,应采用外接法,在待测电阻值较大时,应采用内接法。因此,在选择测量电路之前,应该知道待测电阻的大概值。而在实际情况中,有时并不能事先知道待测电阻的大概值,这时应采用什么办法选择测量电路呢?一般是采用试接法。如图
As we all know, there are two kinds of circuits that use the volt-ampere method to measure the resistance value, that is, the ampere meter external connection method and the internal connection method. In order to reduce the system error of measurement and improve the accuracy of measurement, when the resistance value to be measured is small, an external method should be used. When the resistance value to be measured is large, the in-line method should be adopted. Therefore, before choosing the measurement circuit, you should know the approximate value of the resistance to be measured. In actual situations, the approximate value of the resistance to be measured is sometimes not known in advance. What method should be used to select the measurement circuit? The test method is usually used. Pictured