A FFT spectrum analyzer was used to measure the resonant frequency.
A FFT spectrum analyzer was used to measure the resonant frequency.
试验时采用六种实大尺寸试材，共振频率之测定系利用FFT频谱分析仪。
A FFT spectrum analyzer was used to measure the resonant frequency.
试验时采用六种实大尺寸试材，共振频率之测定系利用FFT频谱分析仪。