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INA126放大倍数问题

Other Parts Discussed in Thread: INA126

我使用INA126运放,2,3引脚输入2mV的电压,1,8引脚接入Rg电阻,阻值如下表;4,7引脚分别接-5V,+5V的电源,5引脚接GND;测量放大之后的输出电压如下表,实际的放大的倍数和理论的放大倍数并不相符,这是为什么?

Rg欧 输入电压mV 输出电压V 理论放大倍数
10 2 3.79 8005
22 2 3.81 3640
47.3 2 3.79 1696
100 2 3.64 805
200 2 3.47 405
2.19k 2 3.37 41
20k 2 3.38 9