用GUM方法计算不确定度的测量分辨率:LabVIEW应用

H. Citak, S. Bicakci
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引用次数: 0

摘要

测量不确定度表达指南是一种用于计算测量不确定度的方法。该方法涉及不确定度计算方法,该方法也构成了国际ISO/IEC 17025标准的参考。在GUM方法中,所有的不确定度都表示为标准不确定度。不确定性可以包括考虑多个来源影响的各种组成部分。测量设备的灵敏度导致的分辨率误差对不确定度的计算有很大的影响。模拟测量设备(如万用表)的灵敏度取决于它所包含的ADC的分辨率。具有8位分辨率adc的万用表通常用作传感器电压值一次或多次读取的测量设备。高测量分辨率和操作员的读数误差等因素导致不确定度增加。来自一个传感器或多个传感器的多个数据会导致不确定性显著增加,从而导致严重的时间和人工损失。为了减轻在这种情况下增加不确定性的上述两个因素,需要将模拟数据以高分辨率转换为数字数据并传输到计算机介质中。在本研究中,采用24位分辨率的D7714模拟/数字转换器IC,通过myRIO 1950将数字数据传输到计算机介质中。开发了一种基于labview的软件,用于AD7714 IC的寄存器设置和24位分辨率的数据检索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurement Resolution in Uncertainty Calculation with the GUM Method Approach: A LabVIEW Application
GUM (Guide to the Expression of Uncertainty in Measurement) is a method used for calculating uncertainty in measurements. The method involves an uncertainty calculation approach which also constitutes a reference for the international ISO/IEC 17025 standard. In the GUM method, all uncertainties are expressed as standard uncertainty. An uncertainty may incorporate various components where impacts from multiple sources are taken into consideration. Resolution errors resulting from the sensitivity of the measurement equipment has a significant impact in the calculation of uncertainty. Sensitivity of an analog measurement device such as a multimeter depends on the resolution of the ADC it contains. Multimeters with 8-bit resolution ADCs are often used as measurement devices for sensor voltage values to be read once or several times. Factors such as high measurement resolution and reading errors by operators lead to an increase in uncertainty. Multiple data from a sensor or many sensors cause a significant increase in uncertainty, which results in a serious loss of time and labor. In order to mitigate said two factors which increase uncertainty in such cases, analog data needs to be converted to digital data at high resolution and transferred into computer medium. In this study, an D7714 analog/digital converter IC with 24-bit resolution has been used to transfer digital data into computer medium via myRIO 1950. A LabVIEW-based software has been developed to perform register settings for the AD7714 IC and to retrieve data at 24-bit resolution.
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