热电阻测温仪导线电阻补偿新方法

A New Method of Lead Compensation for Three - Wire Resistance Temperature Detectors

提出了一种用于三线制接法热电阻测温仪导线电阻补偿新方法。在传统的热电阻测温仪的不平衡电桥三线制接法中,连接导线电阻(哪怕仅有1Ω)将对测量结果产生约1％的误差。本文在分析了传统的热电阻测温仪不足的基础上,提出了一种新的导线电阻补偿方法,连接导线即使有较大的导线电阻,测量误差将低于0.1％。实验证明该方法是有效的。

An improved lead resistance compensation technique for use with three - wire resistance temperature detectors is presented. The practice of using the three - wire concept in anun - balanced bridge produces nearly 1% error for a lead resistance as low as 1ft in the conventional resistance temperature detectors. Based on the analysis of drawback of conventional resistance temperature detectors, the paper proposes a new method of lead compensation, which limits the error to below 0. 1 % with much higher lead wire resistances. Experiment result verifies the effectiveness of the new method.