为分析巴歇尔槽明渠流量计的测量能力，利用实验室明渠流速流量标准装置对4#、5#标准巴歇尔槽进行了测试。试验结果显示，随着流量的增加两种型号巴歇尔槽明渠流量计的示值误差均由负转正，且最大示值误差在±3%以内。由此得出巴歇尔槽明渠流量计测量能力能够满足JJG711-1990的要求，适应于明渠流量计量，同时可以根据试验结果进行示值误差定点修正，进一步提高流量计的测量能力。

Polymerase chain reaction(PCR) technology has been widely applied in fields such as life sciences, food testing, environmental protection, etc. With the development of PCR technology, the demand for precise control of PCR analyzers in different scientific research and detection work is increasing. In order to ensure the accuracy and reliability of PCR instrument values, various calibration methods have been released. This paper provides an overview of typical PCR technology and the progress of PCR instrument calibration methods, and looks forward to the future development direction of PCR technology.

According to the current status of multi-parameter monitor calibration and the relevant national policies, a portable instrument with high accuracy ECG simulator is designed. The ECG simulator consists of the computer software and the simulator, combining hardware circuit design, embedded software design and computer software design to achieve a set of simulator, which has high accuracy and reliability, and can arbitrarily edit ECG waveform. This simulator greatly facilitates the daily calibration work of the metrology institute, with high value and broad application prospects.

In combination with the Metrology Law of the People's Republic of China and Article 31 (Metrology Calibration) of the draft of the Metrology Law for soliciting opinions issued by the State Administration for Market Regulation on November 2, 2021, it is explicitly stated that for measuring instruments outside the catalog of measuring instruments subject to mandatory management, the user of measuring instruments can calibrate them themselves or entrust a metrology technical institution with corresponding capabilities to perform metrology calibration. Due to the lack of national verification regulations/calibration standards for the calibration methods of tablet fragility meters, a calibration method for tablet fragility meters in pharmaceutical enterprises has been established in accordance with JJF (Lu) 92-2011 "Calibration Specification for Fragility Testers".

Objective: The results of ventilator calibration are influenced by many factors. To improve the safety of ventilator use and the reliability of ventilator calibration, we should check the impact of the calibration results of the factors in the calibration process, and then give the final calibration results. Method: Introduce the ventilation mode of ventilator, the principle and composition of ventilator. According to the common problems in the work of ventilator calibration, the problems were investigated from four parts: Ventilator Analyzer, air supply device, ventilator control device and patient's gas path. Results: Through the analysis,the calibration results become more rigorous and reliable.

温度传感器（temperature transducer）是指能感受温度并转换成可用输出信号的传感器。利用NTC的阻值随温度变化的特性，将非电学的物理量转换为电学量，从而可以进行温度精确测量与自动控制的半导体器件，建立医药企业内部温度传感器校准方法的研究能合规开展内部温度传感器校准工作，促进公司降本增效，同时也能提升计量技术水平。

麻醉呼吸机是手术室里不可缺少的重要麻醉设备，在保障病人术中生命方面有着不可估量的作用。麻醉医生通过调节呼吸机麻醉气体浓度等参数控制输入到病人体中的麻醉气体量，避免病人因吸入麻醉药过量或不足而导致生命危险。为保证麻醉呼吸机麻醉气体浓度的量值准确可靠，本文对其校准方法进行了研究，确定了相关的计量特性及技术要求，并通过试验进行了有效性验证，为完善麻醉呼吸机量值溯源提供了参考依据和数据支持。

随着科技的飞速进步和全球市场竞争的日益激烈，计量器具产品检验过程的信息化管理已成为提升产品质量、优化工作流程、提高工作效率及确保企业核心竞争力的关键手段。本文基于对信息化管理在计量器具产品检验中意义的深刻理解，深入分析了当前计量器具产品检验过程管理信息化的现状，进而探讨该领域信息化的发展趋势，以期推动计量器具产品检验过程管理的信息化水平不断迈上新台阶，更好地服务于工业生产和社会发展。

Asoneofthethreeapplieddisciplinesofmetrology,industrialmeasurementplaysanimportantsupportingroleinensuringthesmoothandstableproductionofindustrialenterprisesandcontrollingthequalityofmanufacturingprocess.Basedonthelinearandcontinuouscharacteristicsofindustrialmeasurementsystem,combinedwiththeanalysisandapplicationofdigitaltechnology,itcanachievethegoalofensuringaccurateandreliablemeasurementmanagement.

According to ISO10012 standard, the purpose of enterprises to establish a measurement management system is to ensure that the measurement equipment and measurement process can meet the intended use, to achieve this purpose, measurement confirmation is the most important link, it is to ensure that the measurement equipment meets the requirements of the intended use of a set of operations required. This paper expounds how to carry out measurement validation from the aspects of understanding, method management and result judgment of measurement validation.

为满足计量机构的长远规划和业务需要，新基地扩建和“一院多区”模式很有可能会成为趋势。“一院多区”可以推动国家计量工作和社会高质量发展，为人民群众提供强有力的计量技术支撑与保障，同时仍存在一些问题。本文结合工作实际分析了计量科研机构在“一院多区”模式下管理面临的挑战和难题，研究和提出了部分优化措施，希望能为众多计量科研机构的发展提供建议与参考。

随着全球气候变化问题的日益严重，碳排放的管理和减少已经成为全球共同面临的挑战。LCA（生命周期评价）作为一种评价产品、过程或活动从原材料获取到最终处置整个生命周期环境影响的方法，其重要性日益凸显。而在“双碳”管理中，对LCA数字化碳数据管理系统的构建尤为关键，其中计量的支撑作用不可忽视。本文旨在探讨计量在钢铁企业LCA数字化碳数据管理系统中的支撑作用。

Metrology is an important cornerstone for promoting social development and progress and enhancing national comprehensive strength, and is one of the important symbols of national core competitiveness. The function of Metrology is reflected in many fields such as politics, economy, culture, society and national defense. Especially in the national defense construction, Metrology is an important support for the development of high-tech weapons and equipment, and an important guarantee for joint operations under information conditions. From the perspective of national legal metrological verification institutions, this paper uses SWOT analysis to analyze the advantages, disadvantages, opportunities and challenges faced by national legal metrological verification institutions in serving military metrological support under the new situation, and puts forward some good suggestions.

As the basic link in the construction of national defense science and technology industry, military metrology provides an important technical basis for the scientific research and production of weapons and equipment, and its standardized management can effectively improve product quality. This paper analyzes some problems existing in the metrological management of military enterprises from the perspective of grass-roots metrological technical institutions, and expounds several aspects such as complicated instruments and equipment, weak management of special testing equipment, and insufficient personnel awareness. It puts forward some suggestions that the metrological management of military enterprises should adopt a hierarchical and classified management mode, improve the metrological assurance work, seek effective traceability ways of special testing equipment, strengthen metrological supervision to improve rules and regulations, and improve personnel awareness, so as to provide reference for improving the metrological assurance ability of military enterprises.

随着智能技术的快速发展，智慧计量在生活各个领域中扮演着重要角色。本文首先介绍了智慧计量的概念和原理，强调了信息检测的重要性，随后讨论了实现智慧计量信息检测所需的关键技术，并提出了智慧计量信息检测系统的构建方法，包括系统架构设计、数据流程与信息传递、系统硬件与软件配置等方面。对智慧计量信息检测面临的挑战进行评估，并提出了对未来研究的展望。

Measurement is an activity that achieves unit unity and ensures accurate and reliable measurement values. It is an important foundation for scientific and technological innovation, industrial development, national defense construction, and people's livelihood guarantee. It is also an important support for building an integrated national strategic system and capability. As the core of the enterprise quality management system, the professional skills and level of metrology personnel directly affect the quality of metrology work and the accuracy and reliability of quantity traceability transmission.

With the Fukushima nuclear power plant nuclear sewage discharge incident, people are particularly concerned about the impact of radiation on the environment and health. Radiation monitoring instrument can directly reflect the dose rate in the environment, so it plays an important role in daily work and life and the performance is an important problem worthy of attention. In this paper, 20 different types of imported and domestic radiation monitoring instruments, which are commonly used in the market at present, are verified by the standard equipment of the air kerma of γ-ray radiation protection level in Shandong Institute of Metrology. Through the analysis and comparison of the repeatability and relative intrinsic error of its performance, it is found that the radiation monitoring instrument of ionization chamber and scintillator type is superior to that of GM tube type, in general, the comprehensive performance of imported instruments is slightly better than that of domestic instruments.

This article explores the factory measurement performance testing method of mass flow meters used for natural gas trade measurement. Firstly, the advantages and current research status of mass flow meters at home and abroad were introduced, followed by an explanation of their basic principles and components. Next, the testing object and main technical indicators were clarified, and finally, the factory test/inspection items and objectives were detailed. The research aims to provide reference for the performance index testing of newly developed mass flow meters to ensure their accuracy and reliability.

With the significant increase in sewage treatment plants, China's requirements for effluent quality have become extremely strict. Turbidity is a very important indicator in water quality detection, so the calibration of online turbidity meters should also be given equal attention. The online turbidity meter is currently calibrated according to the calibration regulations of non online turbidity meters, so the calibration device of online turbidity meters is currently a blank field. This article explores the difficulties and future development trends of online turbidity meter calibration devices.

Abstract: This article briefly introduces the process of removing impurities in copper and alloy smelting process, and removing deoxidize as well on line. It illustrates the structure of oxygen probe for copper liquid testing, and the application status in China. We got the testing results between domestic copper liquid oxygen probe and foreign brands from data accuracy, stability and test graphs reliability, etc. through comparative testing, and finally we received good feedback from end customers.

Piston pressure gauge is widely used as a standard device in the field of pressure measurement due to its high accuracy and good stability, and it can be divided into two types: liquid piston manometer and gas piston manometer according to its different working medium. The piston pressure gauge is mainly composed of a piston system, a weight system and a pressurization device, among which the piston system as the core element directly affects the accuracy level of the piston pressure gauge. The piston system is composed of piston rod and piston cylinder, and the selection of its material must consider the hardness, pressure deformation coefficient and thermal expansion coefficient of the material, and the stability of its shape change is an important factor affecting the overall stability of the piston manometer.

With the increasing application of gas detector in various fields, the demand for its measurement work is also increasing. However, there are some problems in the existing measurement regulations and testing equipment, which restrict the effective development of the measurement work of the gas detector. This paper analyzes the current situation and problems of gas detector measurement, and puts forward some suggestions on improving the formulation of regulations, optimizing the detection device, unifying the standard gas flow standard and improving the working environment according to these problems. These suggestions are aimed at improving the effectiveness of gas detector measurement and pointing out the direction for the future development of gas detector measurement.

文章根据民航扭矩扳手使用频率高、机坪使用环境复杂、人为操作不当等特点导致其存在超差或损坏的风险，以及现有计量管理的不足，提出了一种在工具借用场地设立副标准来减少对于损坏或超差的扳手溯源其损坏或超差起始时间的方法。

The Temperature Group Laboratory of the National Metrology Institute of Turkey (TUBITAK UME) has realized the scale in the range from the argon triple point (83.8058 K) to the copper freezing point (1357.77 K) and also constructed the International Temperature Scale of 1990 (ITS-90) defining fixed points. The scale is realized in the low-temperature sub-range by interpolation between the triple points of water, mercury, and argon. The calibration of thermometers below the temperature of the triple point of mercury requires the realization of the argon triple point. Since calibration laboratories are asking for references down to ?60 ?C, a triple point of carbon dioxide (CO2) gives this opportunity to be used as a secondary fixed point. Another aim of this work is to study the ability of CO2 vapor pressure to realize a vapor-pressure thermometer for covering the range from 216 K up to room temperature. This realization is intended to provide an approximation of the international temperature scale in this temperature range. The vapor-pressure thermometer is intended to be assessed by using the triple point of carbon dioxide and by measuring the pressure values at the temperatures of the triple points of mercury and water. Realization of the triple-point temperature of carbon dioxide and the development of the vapor-pressure thermometer will be investigated and presented in this article.

This article discusses the development process of a high-precision AC parameter tester, and applies the latest electronic and computer technology to design the hardware circuit of the AC testing part and the overall control software of the system. Other instruments are used to verify the technical indicators of the device. The device can mainly test parameters such as AC voltage, AC current, AC power, AC phase, and AC frequency. It has the characteristics of high testing accuracy, small size, and light weight, and can be widely used in many fields such as electric vehicle charging piles, power plants, power transmission, high-speed railways, etc. to test and verify electrical signals.

The temperature block calibrators are widely used for on-site measurement and online calibration in the food, petrochemical, pharmaceutical, semiconductor and other manufacturing industries. In this paper, an automatic calibration device for calibrating the temperature block calibrator is developed for the requirement of calibrating the temperature block calibrator. A portable thermometer is made by integrating a seven-bit half-digital multimeter, a multi-channel low-noise scanner and a communication module. Write the automatic calibration software, connect the USB or RS232 interface on the dry type temperature calibrator to communicate with the dry type temperature calibrator, so that the whole calibration process is controlled by the software. The automatic calibration device can set the calibration temperature point through the software, perform stability judgment, data acquisition and processing, and generate the corresponding calibration original record and calibration certificate, which can effectively improve the calibration efficiency of the temperature block calibrator.

Thisarticlestudiesthecalibrationprojectofexternalarcradiuscalipers,designsandproducesaspecificsetofstandardarcs,realizesthetraceabilityoftheindicationerrorofexternalarcradiuscalipers,andverifiesthescientificrationalityandpracticalfeasibilityofthistraceabilitymethodthroughthetraceabilityexperimentofstandardarcsandthecalibrationexperimentofexternalarcradiuscalipers.

Liquid chromatograph is an indispensable equipment in the process of inspection, analysis and research of pharmaceutical companies[1]. It has the characteristics of high resolution, high sensitivity, fast analysis speed and good repeatability. In order to use the measuring instrument correctly and ensure the accuracy and reliability of the calibration results, the measurement standard of the liquid chromatometer verification device is established. Only by starting with standardization and full participation can we create a competitive advantage in the market and realize the sustainable development of the enterprise. This paper introduces how to establish the measurement standard of the enterprise's internal liquid chromatograph verification device through the composition of the measurement standard, the main technical indicators, the measurement standard's measurement value traceability and transfer block diagram, the measurement repeatability assessment and the uncertainty assessment, etc., combined with the "measurement standard assessment Code"[2] and "Verification Regulation of liquid chromatograph"[3].

摘要：三维面积测量仪，又称3D面积测量仪。采用新型的非接触光学测量技术；实现对复杂物体的快速面积计算、体积计算、尺寸计算以及数据输出等。利用表面积测量在食品安全、检测检疫、法院鉴定、医疗诊断等领域有广泛的应用，三维面积测量仪为实用于快速、准确地计算不规则物体的面积，包括任意面积、表面积、体积等，由于没有相对应的计量规程规范。本文探讨了三维面积测量仪的计量校准方法。

A calibration method by solid density standards is proposed to address the current situation where solid densimeters can only be calibrated using JJG999 in liquid mode. The expanded uncertainty obtained through uncertainty evaluation is U=0.0016g?cm-3（k=2）, which meets the requirements for traceability of measurement values and provides a convenient and effective method for the calibration of solid densimeters.

Abstract: Water mist has a strong attenuation effect on infrared radiation. In this paper, the paper briefly describes the attenuation characteristics of water mist on infrared spectrum, describes and analyzes the energy changes of infrared spectrum radiation absorbed and scattered by water mist in the process of radiation transmission by Lambert-Beer law. At the same time, the scattering coefficient and extinction coefficient of water mist particles are calculated by means of Mi scattering theory, and the influence of other factors in the path radiation process is considered. The shielding and attenuation characteristics of water mist to infrared radiation energy are explained by testing and evaluating. In the laboratory environment, the water mist environment is simulated, the attenuation characteristics of infrared radiation are analyzed, and the water mist model is established. The correction factor of infrared radiation attenuation was obtained by using Lamberbier's law, and the correction factor was added to the non-contact infrared temperature measurement system for real-time temperature correction. The research shows that the precision of non-contact infrared temperature measurement system can be improved effectively by introducing correction factors.

Organic high-resolution fan-shaped magnetic field mass spectrometers, which have specific advantages in detecting samples such as polychlorinated biphenyls and dioxins, are mostly calibrated based on gas chromatography-mass spectrometry due to the lack of technical specifications and other metrological documents, so their instrument performance was ineffective. In recent years, with the implementation of JJF1930-2021 "Calibration Specification for Organic High Resolution Fan Magnetic Field Mass Spectrometers", more and more fan magnetic field mass spectrometers have been metered. This article mainly elaborates and analyzes the situations encountered when measuring instruments, and provides some corresponding solutions.

The article mainly analyzes the reasons for poor sealing performance of pipettes based on factors such as the usage environment, personnel operation, maintenance, etc., combined with the design structure and working principle of pipettes. Then, starting from the equipment and verification methods used to verify the sealing performance of pipettes, new ideas are proposed to improve the sealing performance of pipettes. The aim is to enable customers or verification institutions to quickly and effectively verify the sealing performance of pipettes And accurately complete the sealing verification of the pipette.

The nanovoltmeter has the advantages of low noise and zero drift, and is used for measuring small voltage signals, such as measuring low potential scanning switches, thermocouples, etc. , there is no national technical standard for the traceability of voltmeters. This paper discusses the traceability of nanovoltmeter by standard source method, standard divider method and current-voltage conversion method.

Abstract：The uniformity of radon volume activity in a radon chamber is an important indicator for evaluating its performance and a significant factor affecting the uncertainty of the calibration results of radon meters. In this experiment, a standard radon meter was used to measure the uniformity of radon volume activity at different sampling points in the sampling area of the radon chamber. Due to the long measurement time required for uniformity testing, the stability of the radon chamber during this period will also have an impact on the test results. Therefore, the stability of the sampling center area was also tested under the same measurement period, and the experimental results of stability and uniformity were compared and studied. The experimental results show that the 8-hour stability of HD-6 radon chamber meets the requirement of better than 5% in the calibration regulations; When the measurement period is 3 hours, the standard deviation of the stability measurement result is 1.03%, and the standard deviation of the uniformity measurement result is 1.30%. The two are very close, indicating that the influence of using different sampling ports on the measurement results can be ignored, and the uniformity of the radon chamber sampling area is good.

Currently,there is no veritification calibration backgrounds and illumination requirements for the common uesd working glass container,However,during routine calibration and comparisons of working glass container,it has been observed that the calibration background and illumination have a significantly impact on the measured capacity values of common used working glass.Through studies involving capacity determination and visual fatigue assessment of 100mL sigle line volumetric flasks under different calibration backgrounds and illuminance,it has been determined that when calibrating working glass container,utilizing the natural light source (or white) background along with black shield or black cloth curtain,so that black background is below the marking lines and the natural light source (or white) background is above the marking lines,resulting in accurate and reliable measurement data.Further visual fatigue trials indicate that the suitable range of illumination during the calibration of common used working glass container is (400 to 2500) lux.

气体超声流量计在实流检定站安装条件下的流动剖面修正系数和现场安装条件下的偏移量，可能导致精度误差范围超要求。采用计算流体力学仿真软件对一套非充分发展流条件下的实验装置进行建模仿真，通过对一台8声道交叉对射气体超声流量计的声道切换，实现3种声道组合的工作模式，用3种模式下的实验数据来验证仿真结果。研究结果表明：声道截面上的流速分布状态的仿真结果与实际分布状态基本一致，进一步对仿真结果进行量化，结合实验装置的数据，对不同安装条件下的误差偏移量，可以提供有价值的参考。

摘要：标准金属量器使用比较法进行检定，普遍效率较低，特别对于较大型量器，底阀控制不便捷，微调阀门控制标称液位受人为读数因素影响，对检定使用的恒温水箱储存水效率较低，本文提供了一种新的金属量器检定装置、检测系统和供水系统。通过对底部三通阀门和微调阀门的改进，对储存恒温水箱注水方式和保护方式进行了改进，根据上述改进方式，设计了一套完整的检测和控制系统。该系统对标准金属量器的标称液位进行准确控制，对恒温水箱自动注水进行了三层保护。通过试验表明：此控制系统符合国家检定规程的使用要求和准确度的要求，能够大幅度提高检定效率。

This paper takes the vertical metal can as the research object and adopts the whole station scanner as the main measuring equipment. The work flow and calculation process of the vertical metal tank deformation detection project are summarized in detail and verified. The practice shows that the method is effective and accurate for the deformation detection of the vertical metal tank, and provides a reliable basis for data visualization for the safe operation and deformation repair of the vertical metal tank.

Based on the problem of small diameter deviation found during the diameter detection process of the calibration ball of the coordinate measuring machine using the small flat measuring head of the length measuring instrument in actual work, research is carried out. By using three different probe combinations, namely ball probe+ball probe, flat probe+ball probe, and flat probe+flat probe, to calibrate the same calibration ball, it was found that the data of the first two probe combinations were basically consistent, while the measurement results of the two flat probe combinations were slightly smaller by 1.5 μm. After analyzing the reasons for the errors in the experimental results of the three probe combinations, it was determined that using a ball probe+ball probe is a relatively high accuracy measurement method.