如图，这个电路为12V直流供电。VCC5V是电源芯片输出的5V给传感器供电。Iout接个负载电阻RL到12VDC的负端。
有个问题，当压力在0pa时，负载电阻RL=50Ω，输出电流为4.11ma，更换RL=250Ω，输出电流为4.01ma，测量传感器的输出电压Vout一直都为0.2V，是什么原因引起负载电阻变化输出电流也变化？
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