... level crossing 平面交叉，平交道 level detecting 电平测试 level detection 水平检测 ...
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承载高测试电压的导体也应该采用屏蔽，以防止与邻近的低电平电路发生干扰。
Shielding may also be applied to a conductor carrying a high level test voltage to prevent interference with nearby low level circuits.
一旦查出问题后，调制解调器需要重新连接和测试，来验证正常的传输电平。
Once the problem is fixed, the modem is reconnected and tested to verify normal transmit levels.
如果测试电路是浮动的﹐示波器的地也可以接到除地以外的其他直流电平处。
Scope ground may be connected to other DC level in the circuit other than ground provided the circuit under test is floating.
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