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如上图所示，输入信号为方波1mv信号，经1292R采集后得出的波形，总是间隔4s左右出现一个干扰信号，采集电路是参考TI电路来做的，不知道哪里的问题会引起这个效果。求教，求教，求教。
下图为寄存器配置参数：
下图为采集电路图：
