说明：  智能仪表万能信号输入级电路设计，现在的工业显示控制仪表都具有万能输入，何为万能输入？万能输入可以输入20多种传感器信号，如 ­ 线性信号4~20ma，0~20ma，0~10ma，0~5v，1~5v，0~10v， ­ 热电偶，T,R,J,B,S,K,E, ­ 热电阻，PT100,CU50,PT1000等。 ­
(Intelligent Instrument universal signal input level circuit design, industrial display and control instrument now has a universal input, what is universal input? Universal Input 20 kinds of sensor signals can be input, such as linear signal 4 ~ 20ma, 0 ~ 20ma, 0 ~ 10ma, 0 ~ 5v, 1 ~ 5v, 0 ~ 10v, thermocouple, T, R, J, B, S, K, E, thermal resistance, PT100, CU50, PT1000 and so on.)