By means of negative feedback, the motor's speed fluctuation of the device, caused mainly by voltage fluctuation of power supply, can be controlled.

采用电压负反馈法，控制主要由供电电网产生电源电压波动而引起的储纬器电机转速波动。

youdao

Surface activation: activation plating must take positive power supply, plating document connected with negative voltage 8-15v, time, 60-90s.

表面活化处理：活化时镀件必须接电源正极，化工泵镀笔接负极，电压8 - 15v，时间60 - 90s。

youdao

Depending on the polarity of an ESD event you apply to the circuit's input connector, its high-voltage spike discharges through diode D1A or D1B into the positive or the negative power-supply rail.

依靠ESD适用电路输入连接器的极性，其高电压放电通过二极管d 1a或d1b进入供电正向或负向电源。

youdao