烘干法模拟显示水分测定仪测得值的不确定度评定

烘干法水分测定仪是基于烘干原理直接对衡量样品表面分离物或微量水分进行计量分析的仪器。本文依据JJG658-2010《烘干法水分测定仪检定规程》,对模拟显示水分测定仪的测得值进行不确定度评定。     

JJG 658—2022《烘干法水分测定仪检定规程》解读

在物质生产和销售过程中，物质本身的水分含量是一个至关重要的因素，它影响着物质的贮存、价格和品质。烘干法水分测定仪的技术革新增加了该类水分测定仪从制造到计量控制的技术难度。为了提高我国烘干法水分测定仪的生产技术水平，规范现有烘干法水分测定仪市场，加强对烘干法水分测定仪的法制计量管理，市场监管总局颁布了JJG 658—2022《烘干法水分测定仪检定规程》。该规程的修订参照OIML水分测定仪国际建议和非自动衡器国际建议，是对烘干法水分测定仪进行计量控制的完整的计量技术法规。文章主要从修订背景、主要修订内容、执行过程中应注意的问题、标准器变化及其影响等方面，对新修订的JJG 658—2022进行解读，从而有效解决检定规程执行中的统一性和可操作性问题，以便计量检定人员正确理解、执行该检定规程。     

对《烘干法谷物水分测定仪》检定规程的探讨

目前,对烘干法谷物水分测定仪（以下简称水分仪）的检定,是依据JJG658-1990《烘干法谷物水分测定仪》检定规程.其中水分仪的称量装置主要以模拟指示为主,但随着称重传感器及机电结合技术的应用,数字指示的水分仪在检定过程中也经常遇到,这样,我们就面临一个无检定规程可以依据的问题.     

烘干法电子水分测定仪检定中常见问题及分析

<正>0引言近年来,随着烘干法水分测定仪技术的革新,烘干法水分测定仪已被广泛地运用于实验室、医药行业、食品行业、环境卫生以及化工业生产中~([1])。烘干法水分测定仪是基于烘干原理直接对衡量样品表面分离物或微量水分进行计量的仪器,作为测量物品含水量的专用仪器,它可以对加热过程中物理形态和化学形态     

烘干法水分测定仪的测量值的不确定度评定

烘干法水分测定仪广泛应用于医疗、卫生环境及轻工业生产中,它可以对加热过程中物理形态和化学形态稳定的样品进行表面水分含量的测定本文结合实际检定工作,分析了烘干法水分测定仪检定过程中的不确定度并给出了不确定度评定方法。     

覆膜电极溶解氧测定仪检定装置及仪器示值误差检定结果的不确定度评定

本文根据JJG 291-2008覆膜电极溶解氧测定仪检定规程中计量标准器的主要计量性能指标,评定了覆膜电极溶解氧测定仪检定装置和仪器示值误差检定结果的不确定度.     

烘干法水分测定仪测量结果的不确定度评定

根据JJG 658—2010《烘干法水分测定仪检定规程》对数显式烘干法水分测定仪测量结果的不确定度进行评定。     

对容量法微量水分测定仪计量方法的讨论

<正>测量样品中水分含量的方法很多,常用的有烘干法、卡尔·费休库仑法、色谱法、卡尔·费休容量法等。对于前3种方法所使用的仪器,目前国家都已经发布了相应的检定规程,但对于容量法卡尔·费休水分测定仪,则一直没有发布相应的检定规程或校准规范。而实际上,容量法卡尔·费休水分测定仪在石油化工、药检制药、日用化工、涂料、食品等行业有着非常广泛的应用,考虑到市场需求,许多计量机构都开展了或     

谷物标准水分样品的制备方法

谷物水分测定仪在量值传递和溯源上有着自身特点。通常情况下,计量标准或标准物质的量值是自上而下逐级量传到工作计量器具,而工作计量器具的量值是自下而上逐级溯源到计量基准或高等级标准物质。而谷物水分测定仪检定所用的计量标准(标准物质),依照JJG891-2005《电容法和电阻法谷物水分测定仪》检定规程要求,是由检定人员用当地原粮制备谷物标准水分样品,对谷物水分仪的示值误差进行检定。这就     

数字显示水分测定仪示值误差测量结果不确定度评定

依据JJG 658—2010《烘干法水分测定仪检定规程》,对数字显示水分测定仪示值误差测量结果进行不确定度评定。     

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.     

数字电能表的校验方法研究

为解决因数字电能表工作原理和接口方式都发生的根本性改变而导致的传统检定设备和技术已不能满足其检定要求这一难题,根据数字电能表的特点提出一种数字电能表的误差校验方法。通过分析,该方法不仅能向下校验低等级的数字电能表,也能向上通过更高等级模拟电能表溯源到国家基准,解决了量值传递问题。     

作为标准表非定点使用的涡轮流量计评定方法探析

分析非定点使用时涡轮流量计仪表系数的线性内插和曲线拟合方法,并基于10台涡轮流量计的检测结果,对两种方法计算结果的不确定度进行了比较,结果表明:曲线拟合法可以对涡轮流量计的仪表特性进行很好的预测,且计算结果的不确定度明显小于线性内插法。     

一种新型衡器自动测量系统

根据国际建议OIML R76中的试验要求,设计了一套衡器性能自动测量系统。该系统可以任意组合标准砝码进行50~3000 kg各种衡器的型式评价试验,它通过控制器能够实现无冲击、无擦靠的自动加载和卸载功能,可以完成对50~3000 kg被测衡器的示值误差、重复性、除皮、静态温度和湿热稳态等各项型式评价试验,解决了大型衡器难于通过人工方式进行型式评价试验的问题。实验结果表明该系统的相对不确定度不大于5×10^-6。     

大口径多声道超声流量计的干校验法检定

通过理论分析和大量的实验研究，为多声道超声流量计干校验法提供了依据。     

Design, Construction and Calibration of a Triaxial Dynamometer for Measuring Forces and Moments Applied on Tillage Implements in Field Conditions

In this research, a dynamometer was designed, constructed and calibrated to measure the forces and moments applied on tillage implements. This dynamometer is able to measure the three orthogonal forces acting on the implement and the three moments acting around the orthogonal axes, up to a maximum force of 20 kN and a maximum moment of 20 kN m. The dynamometer uses two extended octagonal ring transducers mounted in a back-to-back arrangement with their axes at right angles and has a tubular torque meter for torque measurement. For mechanical design of the dynamometer frame and its units, the finite element method and CATIA software were used. The device was machined from the solid part and high tensile steel. The forces and moments acting on the dynamometer were measured by using the strain gauge bridges on two extended octagonal ring transducers and on the torque meter tube. The results of data analysis, including forces applied on the dynamometer, the designing method of rings and torque meter tubes, the mounting arrangement of load cell parts on each other, the mounting method of load cell on frame and the position of strain gauge on load cell, in other words, the position of different parts of the dynamometer relative to each other has been explained in this paper. Calibration of the measurement unit was done by a calibration system which was designed for static calibration of the triaxial dynamometer. The results of calibration of the measurement unit showed that the designed and constructed dynamometer has appropriate precision, sensitivity and good repeatability for measuring the desired forces and moments. The results showed a high degree of linearity between output voltage of bridges and applied forces and moments. The interaction effects of the applied forces and moments were very negligible.     

热计量仪表的误差分析

本对热计量仪表中采用的热量计算方法进行了分析，提出了计算热计量仪表整体热计量误差的方法，并对热计量仪表的标定方法进行了分析比较，同时分析了热分配表的特点。     

Advanced Instrument For Field Calibration of Electrical Energy Meters

Calibration of electrical energy meters is coming up as a metrological concern. The latest European Union (EU) directives about measuring instruments adopted for commercial transactions state that their accuracy has to be verified in actual operating conditions. This requirement is leaving all laboratories involved in energy meter calibration in serious difficulty because this kind of metrological verification is, at the moment, still not fully developed or even clarified in all involved aspects. In this paper, a measurement equipment for the calibration of energy meters is presented. Its structure and metrological characterization are discussed. To improve its performances without increasing its costs, two online digital compensation procedures have been realized and are shown: one increases the spectral purity of test signals and one corrects the transducer frequency response. Experimental results relating metrological characterization have shown that the so-realized calibrator is suitable for the onsite calibration of energy meters.      

峰值功率计校准方法的研究

为解决峰值功率计所特有的突发功率参数的校准问题,从在数字移动通信系统中广泛使用的突发信号的各项特殊功率参数以及峰值功率计的测量原理入手,以传统功率校准为基础,结合新参数特点对校准峰值功率计的原理和方法进行了研究,最后建立了校准系统,并给出了突发功率的测量不确定度分析,结果其扩展不确定度为0.17 dB,满足峰值功率计的校准要求。     

New hygrothermal balanced moisture meters for sheet materials

Conclusions The investigations carried out have shown that the static characteristic of hygrothermal moisture meters for sheet materials depends strongly on the temperature of the surrounding medium, i.e., on the temperature of the investigated material. In order to eliminate the temperature error in such moisture meters it is possible to recommend a method based on use of two identical sensitive elements-resistance thermometers the first of which is in hygrothermal balance and the second of which is only in thermal balance with the investigated material.Analysis of the static and transient characteristics of hygrothermal balanced moisture meters for cellulose, paper linen, and leather shows that the moisture meters developed can be used for other sheet materials up to their maximum hygroscopic moisture contents.The hygrothermal method can be the basis for creating instruments for automatic monitoring and control of the moisture of solid and friable materials for which the electrical and other measurement methods for moisture measurement are unsuitable for a number of reasons.Translated from Izmeritel'naya Tekhnika, No. 12, pp. 65–67, December, 1971.