数据采集设备的失真度测试方法研究

根据失真度的测试原理、通用测试方法及其特点，提出一种针对数据采集设备的失真度测试方法——改进的频谱分析法。频谱分析法的核心是FFT，FFT方法进行谐波分析会出现谱泄漏现象，影响失真度的测试精度。针对这种现象，进行了特殊测试频率点和加窗函数两项改进处理。经数据分析与处理表明，改进后的频谱分析法有效地减少了谱泄漏的影响，真实还原了各次谐波的幅度，提高了失真度的测试精度，为数据采集设备提供了合理测试方案。

Study on methods of distortion measurement of data acquisition equipment

Degree of distortion is an important performance index of data acquisition equipment,however there isn't any special measuring instrument for this equipment by now.Therefore,according to distortion measurement theory and general methods,this paper proposes an improved spectrum analytical method to measure the degree of distortion of data acquisition equipment.The core of spectrum analytical method is FFT,which generally brings spectrum leakage in course of analysis,and affects the precision of distortion me...