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一、安培表改电流计。如图1,R_2是分流电阻器,在与负极相接处断开,接一个开关。断开时,只用表头,可做灵敏电流计。接通时,仍做安培表。改装后,为了不使安培表灵敏度降低,把分流电阻线接入开关时,先把其它接头焊好。把标准表,改装表、滑动变阻器串接,再接入电源。调节滑动变阻器,改变电流强度。同时调节分流电阻(R_2)与开关接头,使每次改变电流强度后两表指针指示刻度一样,选出最佳点,再把分流电阻线焊死。
First, ammeter to change the ammeter. As shown in Figure 1, R_2 is a shunt resistor, which is disconnected at the junction with the cathode, followed by a switch. When disconnected, only sensitive meter can be used as a sensitive galvanometer. When switched on, the ammeter is still done. After the modification, in order not to reduce the sensitivity of the ammeter, when the shunt resistor wire is connected to the switch, the other connectors are first welded. Connect the standard meter, conversion meter, and sliding rheostat, and then connect the power supply. Adjust the sliding rheostat to change the current intensity. At the same time adjust the shunt resistor (R_2) and the switch connector so that each time the current intensity is changed, the pointers of the two tables indicate the same scale, the best point is selected, and the shunt resistor wire is then welded.