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INA116输出固定0.9V

Other Parts Discussed in Thread: INA116

INa116对PT1000(电流0.25mA)两端电压进行放大,RG=5k(应该放大倍数11),输入偏置电阻10M欧,输入差分电压0.28V,电源+-5V。

但是输出一直是0.9V不变,其它的输入电压(0.028V)也输出0.9V。

测量RG两端电压发现两端都是对地电压3.8V,明显不对。

这是由什么问题造成的呢