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使用电流天平复现安培是由电流天平和与电流天平线圈串联的安培计实现的。图5—9是用以复现安培的计量基准——电流天平的电路。由于一般指针式仪表只能达到1×10~(-3)的测量不确度,不能满足复现安培的需要,因此采用如图5—9所示的电路,以电位差计法控制被测电流,靠手动或自动调节镇流电阻,使电阻器 R 上的电位降和韦斯顿电池的电动势 E 相平衡。因此,电流便保
Using current balance Reproducing amperes is achieved by a current balance and an ammeter in series with a current balance coil. Figure 5-9 is a circuit used to reproduce the ampere meter-current balance. As the general pointer instrument can only reach 1 × 10 ~ (-3) of the measurement uncertainty, can not meet the needs of the reappearance of amperes, so use the circuit shown in Figure 5-9, with potentiometer method to control the measured Current, manually or automatically adjust the ballast resistance, so that the potential drop on the resistor R and Westington battery EMF balance. Therefore, the current is guaranteed