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选频表的重要功能就是对信号作谐波分析.在测量正弦信号时,选频表能发挥其高灵敏度的特点,但在测量伴有基波输入的高衰减谐波时,就要受到机内非线性失真的限制:原因之一是选频表的过载能力差而不能测量;再者是虽能测量,但干扰误差太大.因此一台高灵敏度选频表作谐波分析时的灵敏度就不一定高.我们试制的-130分贝选频表(输入衰减分档到-100分贝,插入衰减分档到-30分贝),当输入衰减减小-60分贝时,谐波衰减均大于-80分贝;当使用
The important function of the frequency-selective watch is to make the harmonic analysis to the signal. When measuring the sine signal, the frequency-selective watch can show its characteristic of high sensitivity, but when measuring the high attenuation harmonic wave with fundamental input, Internal non-linear distortion of the restrictions: One of the reasons is the frequency of the table can not be measured overloading poor; then it is measurable, but the interference error is too large, so a high sensitivity frequency table for harmonic analysis sensitivity It is not necessarily high.We trial-130dB selection table (input attenuation sub-file to -100dB, insert attenuation sub-file to -30dB), when the input attenuation decreases -60dB, the harmonic attenuation is greater than - 80 dB; when used