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OPA2188AIDR,同相比例放大输出不正常



你好:我的电路如下; 输出怎么总是30V接近供电电压,

我一个电阻一个电阻的去掉,挡去掉最后去掉R1时,7脚输出降到1.2V,当我接上R1(此时只剩下R1)7脚又输出30V,很郁闷,不合乎逻辑。求指导,谢谢