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怎么换算啊
满量程值×（1－补码/FFFFFF)
采用补码表示的AD，一般是差分输入结果有负值或者可以单端输入负压的，这些2进制转10进制的计算在数据手册上会有一个表格给出，你用的是哪个AD
正数补码不变，负数是补码输出等于反码+1. 符号位例外
