Unless it's corrected by "zeroing," the resulting offset produces an error by adding to the input signal.

如果不进行“调零”修正，所产生的偏置量就会叠加到输入信号上产生误差。

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If the AC voltage at the input is large, part of this signal is rectified, producing an error in the DC signal being measured.

如果输入端的交流电压很大，其一部分信号被整流，于是在被测的直流信号中产生了误差。

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Fast Fourier transform (FFT) is the main algorithm for harmonic analysis in electric power system, but when there is the decaying DC component in input signal, FFT algorithm will have higher error.

快速傅里叶变换(FFT)是电力系统进行谐波分析的主要算法，但当输入信号中含有衰减直流分量时，FFT算法会产生较大的误差。

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