欧姆表的工作(原理)是使一个小电流通过部件，从而测量产生的电压。
Ohmmeters work by passing a small current through the component and measuring the voltage produced.
数字式电压表在测量低于20欧姆的电阻时﹐会因为引脚的电阻而使测量不准确。除非它是一个四线欧姆表。
DVM is not accurate in measuring resistance below 20 ohm due to the lead resistance, unless it is a 4 wired ohm meter.
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