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DSP28335的ADC误差问题

请问一下,为什么我的ADC误差接近了0.1V,并且每次重新运行后得到的结果都会有波动,在正负0.06V以内波动,并且不管转换的电压多大,波动的误差量级都是这么多,我是用万用表直接测量dsp输入引脚的电压的,会不会是因为引脚上的静电所产生的干扰?静电可以通过万用表测量到吗?