描述
1756-L71
变频器输出基波及谐波等测试均基于傅里叶变换，保证傅里叶变换精度的一个主要条件就是整周期截断，也就是说，参与傅里叶变换的数据应该是整数个信号周期对应的数据。目前市面上大部分测量仪器做不到这一点，其后果是测量数据波动大，测量精度无法保障。另外，由于变频器输出谐波频率较高，被测信号带宽较宽，根据采样定理，要求采样频率高于信号带宽的两倍。若信号带宽为50kHz，采样频率必须高于100kHz。假设基波频率为1Hz，这样，在整周期截断的要求下，至少分析1S（一个信号周期）的数据，而1S的数据量为100k点，即傅里叶变换的点数为100k点。一般测量仪器的处理器无法处理这么大量的数据，运算速度也跟不上，因此，实际测量中往往通过降低采样频率来减少傅里叶变换点数，而降低采样频率之后，为了不违背采样定理，只能在被测信号输入侧加抗混叠滤波器，这样一来，傅里叶变换可以正常进行，基波可以准确获取，但是，被测信号的高次谐波被抑制了，不能满足变频器输出谐波测量的需要。
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