摘要
主要介绍了高精度多路温度巡检仪系统中调理电路的设计,系统采用恒流源电路作为信号的获取电路,恒流源电路是采用价格低廉的器件通过比较巧妙的设计构成的,文中指出了电路达到恒流效果的关键元器件,根据以往的运用经验,恒流效果十分理想。同时也介绍了传感器在现场的安装技术,为克服两线制带来的线路电阻误差,传感器的对外接线采用四线制方式,详细解释了两线制与四线制的区别,并给出了两线制和四线制的原理图。信号的切换采用常用的多路模拟开关。
This paper mainly introduces the design to the regulature circuit of temperation monitor with multi -way,adopting constant current source circuit to obtain signal ,this circuit uses low -cost parts by the artful means ,and pointing the key parts ,on the basis of past experience ,the effect of constant current is perfect. At the same time ,this paper also introduces the installing technique of the sensor on the spot,in order to overcome the resist error of lines by two -line ways,external connection of temperation adopts 4- line ways. This paper explains the difference between the 2 -line ways and 4 -line ways ,and gives the principle charts of 2 -line ways and 4 -line ways. Signal switches use the analog switches which are used often.
出处
《现代电子技术》
2005年第18期11-12,共2页
Modern Electronics Technique
关键词
调理电路
恒流源
两线制
四线制
regulation circuit
constant current source
2 -line ways
4 -line ways
