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LM258P用作比较器问题,急

Other Parts Discussed in Thread: LM258, LM358, LM293

      LM258用作比较器,使用如下面原理图。从测试数据得知,当3脚电压靠近2脚电压(参考电压),但还是小于参考电压的时候,1脚已经输出高电平的,理论上应该是3脚电压>2脚电压,1脚才输出高电平,这是由于芯片本身缺陷引起的吗?是由哪个参数引起?输入失调电压吗?有什么方法可以改善?

样品号

3脚(mv)+

2脚(mv)-

1脚电平

1

27.41

29.24

29.09

29.24

2

24.57

29.23

29.16

29.25

3

27.40

29.27

29.05

29.27

4

27.60

29.28

29.05

29.27