1.前言许多过程变量——包括压力、流量和液位都需要校准,尤其必须校准的是温度,而在温度测量中用得最多的是热电偶。在当今的质量意识世界中,要保证温度敏感元件,记录仪或控制器的接收电路的输出正 1. Introduction Many process variables - including pressure, flow, and level - require calibration, especially when the temperature must be calibrated and the thermocouple most used for temperature measurement. In today’s world of quality awareness, it is important to ensure that the output of the receiving circuit of the temperature-sensitive element, recorder or controller is positive