该衰减电路是一种降低静电计交流响应的低通滤波器，使我们可以准确地进行直流弱电流的测量。

A damping circuit is a type of low pass filter that reduces the electrometer's ac response so the low DC current can be measured accurately.

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仔细的屏蔽通常能够衰减串模噪声，很多仪器都有内部的滤波器以进一步降低这种噪声的影响。

Careful shielding will usually attenuate normal mode noise, and many instruments have internal filtering to reduce the effects of such noise even further.

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该滤波器在基频处的幅值无衰减，相位无延时，能将2次以上的谐波全部滤掉。

The filter has no fundamental frequency decay and phase delay, and all harmonics above2nd order are filtered.

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