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DS90UR905Q和DS90UR916Q同轴线10CM以下图像显示正常,20CM同轴线连接时屏幕闪烁,示波器观察解串波形比较正常,没有严重失真,硬件参考官方设计,请问还有什么原因造成?

DS90UR905Q和DS90UR916Q同轴线10CM以下图像显示正常,20CM同轴线连接时屏幕闪烁,示波器观察解串波形比较正常,没有严重失真,硬件参考官方设计,请问还有什么原因造成?