【摘要】 热电偶是测温仪表中常用的温度传感器之一。在测温过程中,难以保证热电偶冷端恒温,所以对测量结果必须进行冷端补偿。文中以热电偶工作原理为基础,由PT1000测量冷端温度,通过A/D转换后由MCU传给上位机,将电阻值通过软件换算成电压值加到热电偶的电压上,再通过补偿块消除冷端温度变化带来的影响,从而进行补偿。试验表明,该方法不仅测量精度高,且工作稳定。更多还原

【Abstract】 The thermocouple is one of the common temperature sensors used in thermometers. In the measurement of temperature,it is difficult to maintain stable temperature for the thermocouple cold junction,so the results need cold-junction compensation. In this paper,the cold junction temperature measured by PT1000 is sent to the MCU of the host computer after A / D conversion to convert the resistance value by software into a voltage value,which is added to the voltage applied to the thermocouple,and then the effects of the temperature change in the cold junction is eliminated by the compensation module. Tests show that the method is accuracy and stable.更多还原