皮带秤的称重仪表应用特点和要求

本文叙述了皮带秤的称重仪表应用特点和使用要求,并探讨了新版OIML R50(2011版)4CD《连续累计自动衡器(皮带秤)》国际建议对称重仪表新的要求。     

衡器产品进行软件测评的重要性

通过对我国衡器产品的作弊情况以及新版OIML国际建议及欧盟WELMEC7.2与我国《计量器具软件测评指南技术规范》中对软件相关内容的描述的论述,得出在我国进行软件测评的重要性与迫切性。     

电能表产品技术指标体系的新变化(英文)

There is an imperfection in the accuracy indicators system and the technical parameters system in IEC standards 62053-21 implemented for watt-hour meters currently.This article quoted some parts of OIML MI-003 and R46 contents to provide a reference of the integrity comparison between the accuracy system and technical parameter system.The comparison result shows that the watt-hour meter accuracy technical indicators system of OIML R46 is more integrated.First reason is that it determines all the accuracy(basic error) defining rules just by using the technical parameter Imax efficiently;secondly,it can solve the contradiction that no error regulation of the range from starting current to minimum current in the process of providing,handing over and checking watt-hour meter products’ qualities efficiently.Please pay close attention to the R46 official version which will be released soon,as it is still in the Committee Draft(CD6) stage currently.     

Evaluation of flowmeters for heat metering

Heat flowmeters are expected to be reasonably priced, be very reliable, and have high measurement accuracy. Various types of heat flowmeters have been developed and they are widely used in large residential and industrial buildings. In this study, three types of heat flowmeters (turbine, electromagnetic and ultrasonic) were tested for accuracy, effect of installation position and vibration, durability and performance in the field for several installation positions and in the presence of vibration. We used a liquid flow standard system and a customized durability test system in accordance with the International Organization of Legal Metrology (OIML) R 75-2 heat meter testing method. The field test was conducted in eight different locations from winter to summer. All flowmeters were calibrated before and after the field test, and the measurement deviation and the relative expanded uncertainty were calculated. The mean deviations obtained were–0.21%,–0.07%, and 0.11%, with the relative expanded uncertainties 0.48%, 0.17%, and 0.40% for turbine, electromagnetic, and ultrasonic flowmeters, respectively. The results of position and rotation tests, mean deviations by rotation angles at 90°, 180°and 270°relative to 0°(horizontal position) were–1.24%,–1.07% and–0.80%, respectively. For the vibration tests at 1 m/s² and 5 m/s² vibration acceleration, the turbine flowmeter, the electromagnetic flowmeter and the ultrasonic flowmeter showed deviations that ranged from −0.2% to −0.5%, −0.6% (2.6 m³/h), and 0.0% (negligible), respectively. In the durability tests, the accuracy of all three types of heat flowmeters remained at ±1% or less, showing sufficient durability. In the field test, the deviation of the turbine flowmeter and the ultrasonic flowmeter showed ±2.5% or less deviation. However, the electromagnetic flowmeter seems to be inaccurate below 6.9% of the maximum flow rate.     

基于OIML R46国际建议的智能电能表设计

基于OIML R46国际建议的智能电能表在国内第一代智能电能表的基础上,结合国际高端表计的设计理念,功能上既能符合OIML R46国际建议,又能满足智能电网发展要求。该表采用面向对象的DL/T 698.45协议,实现计量芯和管理芯的"双芯"设计,"双芯"独立运行,管理芯软件支持远程升级,并且支持各种通信资源,能适应未来计量、通信、柔性电价的要求。随着后续OIML R46国际建议在国内落地,该表的设计将投入批量生产中,有着非常广阔的应用前景。     

Development of stepwise tolerances for efficient verification of automatic checkweigher

The aim of this study is to calculate the risks of automatic checkweigher verification according to the specifications of the international recommendation OIML R51 developed by the International Organization of Legal Metrology (OIML) and to propose an alternative method for performing the verification efficiently.The risks posed by the OIML R51 method to the consumer and producer are calculated using the Monte Carlo method. The OIML R51 method was used to develop an alternative method with improved efficiency and almost equivalent risks. The alternative method involves calculating the sample mean and standard deviation of the error and makes acceptance/rejection decisions after weighing every 10 times. The tolerances of the alternative method are stepwise with the upper and lower limits. After weighing every 10 times, the sample mean and standard deviation were calculated, and if they were both less than the lower tolerance limit, the test was completed and a pass decision was made. Conversely, when the mean or standard deviation exceeded the upper tolerance limit, the test was completed and a failed decision was made.The Monte Carlo method was used to calculate the risks and a reduction in the required number of weighings by the alternative method.The alternative method was applied to an actual instrument to evaluate the efficiency of the method. For the instrument used in this study, the expected value of the required number of weighings is 20 in the weighing range of 400 g or more and one-third of the number stipulated in the international recommendation. This means that significant labor savings are possible.     

基于OIML标准的三相电能表检测装置设计

针对传统检测设备很难满足基于OIML R46国际建议的电能表检测需求的现状,文中介绍了一种三相电能表检测装置设计方案。装置采用模块化设计,包括可程控信号源、线性功率放大器、高精度三相标准电能表和多功能误差处理系统四部分。装置具备数字调幅、调频和调相功能,可输出正弦波、高次谐波、方波、和尖顶波等波形,实现对三相电能表的误差校验、功能测试和计量性能保护试验。该方案对国内传统电能表检测设备的改造具有一定的参考价值。     

衡器产品标准、规程与OIML国际建议的关系——目前我国衡器标准、规程与国际标准最易混淆的问题综述

本文主要针对目前在中国衡器行业中,衡器产品标准、规程与国际法制计量组织(OIML)国际建议之间的关系存在的误区,阐述了个人的观点。指出在我国衡器产品标准、规程的编制中应遵循的原则,以期我国衡器产品的标准、规程走上良性发展的正确轨道,并对于我国衡器标准赶超世界水平提出了建议。     

动态称重电路分析与研究

动态称重电路既要求采集的数据阶跃响应快又要求高无噪声分辨率和低温度漂移,因此ADC采集电路的设计对动态称重至关重要。本文阐述的基于TI的ADS1259电路设计的称重数据采集系统,具有响应速度快、分辨率高、温漂低的特点,完全满足动态称重应用的要求。本文将详述该设计方案的设计方法与要点。     

对OIML D-SW国际计量软件指南的理解和浅析

计量检定／校准、数据处理及测量不确定度分析中广泛应用计算机技术和测量软件,测量软件对测量结果的准确性和可靠性起到至关重要的作用。本文通过对OIML D—SW这一技术标准的理解和解读,介绍了国际上对计量器具软件的通用性要求,并为即将颁布的国家技术规范《计量器具软件测评指南》做了技术铺垫。