用2541做ADC电压采集的时候，采到的电压值和万用表不一致，举一个例子。如果底板上不插2541核心板，用万用表测量的电压事0.207V,插上核心板，底板上的电压用万用表量就变成了0.899V，而2541采集到的电压确是0.207V，这是怎么回事。
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