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我用REF2025 的2.5V做参考电压，用ADS1258的通道0去采集REF2025的 1.25V电压，得到3932700的值，除以7800000*2.5 后得到1.2604V左右波动的电压，用万用表测量1.25V基准电压实际值为1.2504V 。为什么差距这么大？
