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乡镇企业的许多电器设备和各种车辆的启动设备都需用直流电源.但是,由于使用时间太久或不细心等原因,而常常会使直流电源的正负极性标记磨得模糊不清或完全被磨掉.另外也经常遇到一些低压直流电源没有标明极性.因此电器维修人员经常需要判断直流电源的极性.笔者在此介绍几种直流电源正负极的判断方法.
Many electrical equipment in township and village enterprises and start-up equipment for various vehicles require DC power, however, the positive and negative polarity markings of DC power supplies are often obscured or used due to long service life or lack of care Completely worn away.Also often encountered some low-voltage DC power supply is not marked polarity.Therefore, electrical maintenance personnel often need to determine the polarity of the DC power.The author describes several positive and negative DC power supply to determine the method.