Abstract: Using a preamp to increase the output magnitude of a J-type thermocoupler. The simple circuit provides compensation over temperature as well as calibration capability. The MAX430 is operated at a gain of 191 to convert the 52µV/°C output of the type J thermocouple to a 10mV/°C signal. The -2.2mV/°C tempco of the 2N3904 is added into the summing junction with a gain of 42.2 to provide cold junction compensation. The ICL8069 is used to remove the offset caused by the 600mV initial voltage of the 2N3904. Adjust the 10K trimpot for the proper reading with the 2N3904 and isothermal connection block at a temperature near the center of the circuit's operating range. Use the component values shown in parentheses when using a type K thermocouple. 相关型号   APP 3: Jul 09, 1998 MAX430 ±15V斩波自稳零型运算放大器 完整的数据资料 (PDF, 400kB) 自动更新 需要自动接收最新发布的应用笔记吗？请订阅EE-Mail™ (English only)。 我们期待您的反馈！ 喜欢？不喜欢？有待改善？或为我们提供建议？请与我们联系 — 我们将根据您的意见或建议改善我们的工作。 网页评价或提供建议   下载，PDF格式 (26kB)  AN3, AN 3, APP3, Appnote3, Appnote 3