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采用2个精密仪器放大器INA333芯片分别采集两路输入电压时输出正常,当采集的两路输入电压串联时两个芯片的输出都不正常。

Other Parts Discussed in Thread: INA333, INA133

如下图所示,INA333采用单电源5V供电,当输入电压Vget1和Vget2不相互关联,输入电压范围在0~48V时。

输出电压VIN0和VIN2的电压现象正常,当V-gnd1和Vget2相连时,输入电压范围在0~48V时,输出电压

VIN0和VIN2的电压均为0,现象不正常,测量电压时发现一个现象R2,R3上竟然有电压。