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51问答网 > 为什么led贴片灯珠用万用表测量，有蜂鸣声的就坏了？

为什么led贴片灯珠用万用表测量，有蜂鸣声的就坏了？

2025-03-15 06:49:00

推荐回答（2个）

回答1：

用一个合适的电阻串联一个4~6伏电源接在led两端，就能判断led的正负极以及是否能发光。

回答2：

用二极管档(高端的该测试电压都在3V以上)可点亮LED并判断
正负极
，如FLUKE系列表。
如果在断电状态下测，蜂鸣响就是击穿了(很多万用表蜂鸣档
阻值
在50欧姆以下就响)。

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