波形失真度，THD，英文全称Total Harmonic Distortion的缩写。是指电器源电流谐波含量占基波电流含量百分比。一般指的是以2次~39次谐波总量与基波电流的百分比，再高次的谐波因绝对值太小而忽略不计。
输出波形失真度低，稳定可靠性高。
波形失真度是影响超低频振动计量校准精度的重要因素。
Waveform distortion of super low frequency standard shaker is an important factor which influences the calibration precision.
它减少了波形失真度和平均叠加次数，提高了生物医学信号提取水平。
Extraction level of biomedical signals is improved by reducing wave distortion and average superposition times.
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