Effect on noise analysis due to windowing function of Agilent 35670Huang Yongjun, Xu Zhuohua, Yi Wensheng Hangzhou Applied Acoustics Research Institute, HangZhou 310012Abstract:Usually, spectral analysis equipments have the functions of FFT analysis and spectral density analysis. When different window functions are applied to FFT analysis in noise measurement, differences are shown that the direct measurement results of the noise spectral density are not same with the one derived from band voltage level. With the 35670- dynamic signal analyzer, the FFT band voltage level is compared with the measurement results of noise spectral density level for different window functions. The experiment shows that the spectral density level results of 35670-analyzer are more accurate to express the energy distribution of input signals and modifications are required when the measurement re- sults of FFT band voltage level are used.[著者文摘]
Key words:windowing function; noise measurement;FFT analysis; spectral density