polarity checking circuit
... 极性检查电路 polarity checking circuit 指示灯检查电路 lampcheckcircuit 错误检查电路 error checking circuitry ...
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当单位自动地被塞住入ac出口它自检、检查对于正确极性和测试设备地面的正直，即。绿色导线在分支电路。
When the unit is plugged into an AC outlet it automatically self-tests, checks for correct polarity and tests the integrity of the equipment ground, i. e. the green wire in the branch circuit.
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