Since a relatively narrow bandwidth is involved, it is also likely that ac excitation also offers greater immunity to rf interference than dc excitation.
因为包含相对地狭窄的带宽，并且是可能的交流励磁为射频干涉并且提供比较伟大的安全性直流励磁。
When measuring low current, electrostatic shielding (as discussed in Section 2.6.2) is the most common way to reduce noise due to AC interference.
在测量弱电流时，静电屏蔽(如第2.6.2节所讨论)是降低交流干扰引起的噪声的最常用的方法。
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.
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。
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