摘要
提出了铂电阻数字测温仪表的最佳设计方案,分析了铂热电阻传感器的非线性特性;论证了现有的线性化方法的利弊,确定了采用非线性A/D转换器实现线性化补偿的设计方案;详细介绍了在-200℃～850℃范围内任意量程的最佳线性化参数及最大非线性化误差的计算方法;给出了具有三线制导线电阻消除功能的仪表完整的设计原理图及整机调试方法.该设计方案整机稳定性好,线路简单易行,调试方便,线性化精度高,不需要基准电压源,适用于全范围内任意量程的仪表,最大限度地降低了铂电阻数字测温仪表的元器件成本和调试成本,另外,同一个线路板,可用于铜电阻数字测温仪表.该设计方案具有很高的推广应用价值.
An optimal design of digital instrument for platinum-resistance thermometers is proposed, and a nonlinear A/D converter is adopted based on the analysis of nonlinear character of the thermometers, and the analytic demonstration of the advantages and the disadvantges of existing linearization methods. The best linearizing parameters and the maximal nonlinearity errors is given for discretional dimension ranging between - 200℃- 850℃ , and the design principle and debugging method is persrnted with the function of error elimination by employing threewire circuit. This design scheme has the advantages of favorable stability, configuration simplicity, debugging conveniency and high linearization accuracy, applicability for arbitrary measurement ranges, no reference voltage and debugging time reduction.
出处
《大连交通大学学报》
CAS
2007年第4期46-51,共6页
Journal of Dalian Jiaotong University
关键词
数字仪表
铂热电阻
线性化补偿
三线制
digital instrument
platinum-resistance thermometers
linearization
three-wire sensor
