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测试条件：采用5V锂电池供电，采样速率7.5k，采样时间100s，将差分模拟输入短接，用串口线发送数据到PC并导入matlab绘制功率谱密度曲线如图所示。
这样的噪声有可能是什么原因造成的？该如何一一排查？ 先谢谢各位
