首页|基于示波器的热电偶响应时间采集系统分析

基于示波器的热电偶响应时间采集系统分析

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鉴于数字示波器在热电偶响应时间测试中的广泛应用,以K型热电偶为例,采用校验仪模拟热电偶的输出热电势,实验研究了数字示波器测量热电势误差,分析了基于热电势瞬态变化曲线通过作图法获得热电偶响应时间的误差.结果表明,在0~100℃和0~1000℃范围内,数字示波器测量热电势的绝对值偏差较大,但是重复性和线性良好.在温度阶跃量的50%处(50℃和700℃),热电势瞬态曲线与温度曲线的偏差分别为0.5℃和2.1℃,约为温度阶跃量的1%.因而,基于热电势瞬态变化曲线通过作图法获得热电偶响应时间的方法误差较小,通常约为温度波动产生的误差.
Analysis of Thermocouple Response Time Acquisition System Based on Oscilloscope
The digital oscilloscope is widely used in thermocouple response time calibrations.Taking K-type thermo-couple as an example,the electromotive force(EMF)output was simulated by a calibrator,and its measurement error using a digital oscilloscope was experimentally studied.The impact on response time which was obtained through plotting method based on the transient response curve of EMF was analyzed.The results indicate that,within the range of 0~100℃and 0~1000℃,the absolute deviation is large,but the repeatability and linearity are good of the digital oscilloscope in measuring EMF.At 50%of the step temperature(50℃and 700℃),the deviation between the EMF transient curve and the temperature curve is 0.5℃and 2.1℃,respectively,which is about 1%of the step tem-perature.Therefore,a small error of the response time of thermocouples can be obtained,usually about the error caused by temperature fluctuations.

K-type thermocoupleresponse timedigital oscilloscopedata acquisition system

刘波、姜盈盈、邹冰妍、王志远

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上海市计量测试技术研究院,上海 201203

上海理工大学 能源与动力工程学院,上海 200093

K型热电偶 响应时间 数字示波器 数据采集系统

2024

自动化与仪表
天津市工业自动化仪表研究所 天津市自动化学会

自动化与仪表

CSTPCD
影响因子:0.548
ISSN:1001-9944
年,卷(期):2024.39(9)