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INA333: STC8H采集仪表放大器INA333的放大信号遇到点问题

Part Number: INA333
Other Parts Discussed in Thread: INA133

电阻桥测电阻的微小变化,经INA333放大20倍,放大后的信号不是个稳定值,也不像是干扰,请看下图,不知道哪里没对,难道是没加输出隔离?第一张图是原理图,VResIn就是进STC8H ADC口的信号,第二张图是这个信号的示波器图