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介绍了用绘图机闭环控制检测装置线阵ＣＣＤ对绘图机图纸测标进行采样，通过快速付里叶变换（ＰＰＴ）计算样本的功率谱，再根据功率话找出绘图机产生速度波动原因的方法。
This paper introduces a method of sampling the scale of the plotter drawing by linear CCD detector and calculating the power spectrum of the plotter by fast Fourier transform (PPT), and then finding out the cause of the fluctuation of plotter speed .