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如图这是我的取样电路，测量0-60V的电压，设置输入范围是2.048V，用六位半表校准，输入电压从0-2V，校准系数增大，2V-23V比较稳定，0.01%的变化，23V-30V惨不忍睹，校准系数减小，10%的变化。
奇怪，采样电阻的问题？还是阻抗匹配的问题呢？你串个匹配电阻试试。
