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在检定电位差计时,要求标准电位差计的最小步值不得大于被检电位差计的最小步值。因为只有在标准电位差计的最小步值小于或等于被检电位差计的最小步值时,标准电位差计才能对被检电位差计的末盘步值进行逐步检测。然而,在实际工作中会遇到标准电位差计的最小步值大于被检电位差计的最小步值的情况。此时应怎样进行检测呢?本文就这一问题进行一些探讨。一、原理为了实现用大步值的电位差计检定小步值的电位差计,我们采用如图所示的方法。图中E_3是辅助回路的工作电源;R_m是电阻箱,用以调节辅助回路的工作电流;R_(N1)和R_(N2)是标准电阻。当回路中有电流I流过时,就会在
When checking the potential difference meter, it is required that the minimum step value of the standard potentiometer should not exceed the minimum step value of the tested potential difference meter. Because the standard potentiometer step-by-step detection of the potentiometer can be detected only when the minimum step value of the standard potentiometer is less than or equal to the minimum step value of the potentiometer being inspected. However, in practical work, the minimum step value of the standard potentiometer will be greater than the minimum step value of the detected potential difference meter. At this point how to test it? This article on the issue of some discussion. First, the principle In order to achieve large step value potentiometer test small step potentiometer, we use the method shown in the figure. E_3 is the working power supply of the auxiliary circuit; R_m is the resistance box, which is used to adjust the working current of the auxiliary circuit; R_ (N1) and R_ (N2) are the standard resistances. When the circuit in the current I flow through, it will be