如果屏蔽和测量仪器之间存在一个交流电势差，则可能有电容性电流通过测量电路，增大干扰。
If there is an ac potential difference between the shield and the measuring instrument, there may be capacitive currents flowing through the measuring circuit that will add interference.
交流采样测量装置作为电网电测量参数的在线测量仪器，具有较好的准确度和稳定性。
Ac sampling measurement unit has better accuracy and stability as the online measuring instrument of the electrical parameters of power network.
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