量程计算器 把4-20ma信号对应成任何量程的计算器-Range calculator to 4-20ma signal corresponding to the calculator into any range

51单片机接入差分信号重量传感器，设定额重，输出控制，同时DA转换（AD421芯片）输出4-20mA。-51 single access differential signal of the weight sensor, set the amount of weight, output control, while the DA converter (AD421 chip) output 4-20mA.

西门子双极性换算关系 4-12-20mA，假设电流电压比800/5,6300/100， 采样原值X,实际工程值Y，注意：12MA工程值理论是为0，可适当减零漂(SIEMENS bipolar conversion between 4-12-20mA, assuming the current voltage ratio 800/56300/100, sampling value X, value engineering Y, attention: 12MA value engineering t