描述
测量直流电流的原理电路图如图2所示。被测电流从“+”,“-”两端进出。RA1~RA5是分流器的电阻,它们和微安表连成一个闭合电路。改变转换开关的位置,就改变了分流器的电阻,从而也就改变了电流的量程。例如,放在50mA挡时,分流器电阻为RA1+RA2,其余则与微安表串联。量程愈大,分流器电阻愈小。图中的R为直流调整电位器。
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