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多用电表,也就是通常所说的万用表,是一种可以测量交流电压、直流电压、交流电流、直流电流以及直流电阻甚至电容、电感的多功能仪表,是一种常用的电工仪表,生活中使用广泛。在这里谈一下它的另外一个用途——用它来判断低压交流电的火线和零线。我们通常是用验电笔来判断低压交流电(220 V)的火线与零线的。在我们身边没有验电笔的情况下如何使用多用电表判断交流电的火线和零线呢?下面是我个人的一点实践经验及相应的解释。
Multimeter, which is commonly referred to as the multimeter, is a multi-function instrument that can measure AC voltage, DC voltage, AC current, DC current, and DC resistance or even capacitance and inductance. It is a kind of commonly used electrical instrumentation used in life widely. Here’s another use of it - use it to determine the live and neutral lines of low voltage AC. We usually use a test pencil to determine the live and neutral of a low voltage AC (220 V). How can we use Multimeter to judge the live line and neutral line of alternating current without checking the pen in our side? Here is my personal practical experience and the corresponding explanation.