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使用INA326将1mV发大1000倍遇到的问题

Other Parts Discussed in Thread: INA326

用DAC产生一个直流电压,通过100K和1.5K电阻分压在1.5K上产生1mV压降;

想使用INA326的单电源模式、外置电阻为2K和1M电阻将1mV放大1000倍得到1V,INA326的正负输入端通过继电器与1.5K电阻相连,继电器的接触电阻为<=70毫欧姆;

断开继电器时,用外用表测量判断1.5K上产生的压降约为1mV;接通继电器接入INA326后用外用表测量1.5K上产生的压降约10多mV,INA326输出为其电源电压值,表现为饱和;

请问,用INA326将1.5K欧姆的1mV放大1000后得到1V输出的方案是否存在问题?