The SIM series (SIM922 and SIM923) from Stanford Research Systems is a set of monitors that simultaneously measure temperature and excitation with four sensors. It is equipped with 10 micro;A precision current source in each channel for sensor excitation. The unit is also considered a Platinum RTD monitor with 1 mA current sources for every channel for sensor resistance.SIM系列sim922和sim923从斯坦福研究系统是一套监测同时测温度和四传感器的激励。它备了10微在每个的传感器激励精密电流源。单位也为是一个1毫安的电流源每个传感器电电监测。