说明：  本文给出了一种利用软件实现4～20mA传感器数据转换的方法，消除了硬件电路中电压放大器输出端的残留电压，保证了数据转换精度
(this paper, the use of software to achieve a 4-20mA sensor data conversion methods Elimination of hardware circuit voltage amplifier output voltage of the residue, ensuring the accuracy of data conversion)