此外，该电阻器还限制回馈安培表的交流增益。
Also, the resistor limits the ac gain of the feedback ammeter.
它可以监测从1到150安培的电流，且能转换最高135伏的交流或直流。
It monitors from 1 to 150 Amperes and switches up to 135 volts AC or DC.
最好使用交流电源供电，并为设备安装保险丝或额定电流小于2安培的自动断路器，自动断路器还必须与其他负载电流电路分离。
It is recommended that AC power supplies to instruments be protected by fuses or automatic circuit breakers rated at not more than 2 Amperes, and must be separated from any load current circuits.
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