service-dat/qc-dat/qc-dat.md
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# qc-dat.md
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-## 电源类
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-
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-- 检测电源是否短路: 万用表测试 输入端, 阻值是多少, 过小的话是短路
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-
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-## 新号端
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-
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-RS485
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-And also measure resistance between RS485 A and B
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-A bad board will have a clear values outside the normal range
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-
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-
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## ref
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- [[qc]]
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