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INA122U输出零点要很久才能稳定



电路如图,前端S+,S-为压力传感器,惠斯通电桥结构,1.5MA激励,差分信号为130MV左右,此信号先通过仪表放大器,仪表放大器REF有119MV,仪表放大器输出接运算放大器跟随,接MCU的ADC口,现仪表上电,零点会发生漂移,约10分钟后才能稳定,如图4    趋势所示,感觉像是电容充电所致,如何解决此问题?