三线制铂电阻高精度测温方法  

The High Precise Temperature Measurement With 3-Wire Platinum Resistor

作　　者：刘少强[1] 张靖[1] 庄哲民[1] 

机构地区：[1]东南大学仪器科学与工程系,南京210096

出　　处：《自动化仪表》2002年第11期20-24,共5页Process Automation Instrumentation

摘　　要：基于可补偿引线电阻影响的三线制铂电阻测量电路提出了一种高精度测温方法。该方法利用双积分ADC ,采用比例法测量铂电阻的阻值 ,并可补偿测量电路的误差。误差分析表明 ,在环境温度变化± 10℃的条件下 ,对 0～ 5 0 0℃测温范围其测温误差不大于10 - 3。Based on a 3 wire platinum resistor measuring circuit, in which the lead wire resistance can be compensated, a high precise temperature measuring method is stated. By using dual integration ADC and ratio method the resistance of the platinum resistor is measured and the error of the measuring circuit can be compensated. The analysis of error shows that the error of measurement is less than 10 -3 within range of 0～500℃ under +/-10℃ temperature variation.

关 键 词：温度测量 高精度测量 铂电阻 三线制 引线电阻补偿 比例法 

分 类 号：TH811[机械工程—仪器科学与技术] TP212.[机械工程—精密仪器及机械]