双通示波器频谱测量的滤波器设计 经过待通过滤波器处理后的频率响应，以及滤波前后的信号的双通道谱测量的结果进行分析，检查滤波器后的信号是否满足用户的频率范围要求-Design of Filter for Spectrum Measurement of Dual Oscilloscope After the filter to be processed by the frequency response, and the signal before and after filtering t