砝码计量标准建标问题探究

法定的技术检定机构,承担着建立计量标准,进行量值传递的职责,作者认为有些机构以一个项目只建一个最高等级的计量标准,在自己内部进行量传,这种做法是不适宜的,本文从技术和管理两个方面针对这个问题进行了分析和阐述。     

浅析砝码作为计量标准器对测量不确定度的贡献

本文主要介绍了砝码检定引入的标准不确定度的计算。     

一种高精度频标比对方法

介绍了相位重合点检测技术和频差倍增原理,提出了基于频差倍增技术的计数方案,实现了虚拟频标比对仪的设计,着重分析了系统的运行原理和实现方法。相位重合点检测是一种高精度测量周期性信号参数的技术,该技术有效克服了±1个数的计数误差,使得仪器的测量精度比普通仪器提高了1000倍以上,可广泛应用于高精度频率测量仪器中。实际证明,基于该方案的频标比对系统精度有了显著提高,且设备构成简单、易于实现,取得了不错的效果。     

静重式力标准机A-B-A检定法的不确定度分析方法

静重式力标准机属于实物标准,检定时用的传递标准器为非实物标准的标准测力仪。由于标准测力仪存在不稳定性、蠕变、漂移等诸多因素,检定人员即使完全按检定规程对力标准机进行操作,若操作程序不科学同样会引起非常大测量不确定度。通过分析,为静重式力标准机检定时不确定度评定估计提供一种方法。     

表面粗糙度标准装置不确定度分析

通过对表面粗糙度标准装置的不确定度分析,证明了其测量能力具备了量值传递的资格。     

圆锥滚子标准件角度不确定度分析

通过对圆锥滚子标准件角度检测结果的不确定度分析,说明该测量系统稳定可靠,测量结果真实可信,测量能力满足使用要求。     

圆锥滚子标准件尺寸不确定度分析

通过对圆锥滚子标准件尺寸检测结果的不确定度分析,说明该测量系统稳定可靠,测量结果真实可信,测量能力满足使用要求。     

强直流计量标准装置量值传递与溯源方法

强直流电流在工业领域有着广泛的应用.论述了强直流计量标准装置的工作原理、量值传递与溯源方法,重点对校验方法及电流变比准确度进行了不确定度评定.旨在建立强直流电流量值传递与溯源体系,即实验室参考标准(0.0005级)、现场传递标准(0.02级)、现场工作标准(0.05级)装置及其量值测试、评定与溯源方法,该方法含盖自校、互校及与其他国内标准比对的全过程,为直流能耗准确计量、节能减排提供科学的强直流计量方法和手段.     

Temperature effect on the reference frequency of FDR soil moisture sensor

The FDR automatic soil moisture sensor must determine reference frequency in the air and water. Experimental studies show that the water reference frequency is influenced by water temperature. The variation of the reference frequency of the sensor is measured with the change of the water temperature,then analysis the influence of the volume water content measurement of the sensor,analysis found that the error is not more than 3% for the measurement of the volumetric water content of the temperature.     

Realization and dissemination of high frequency power standard at INRIM

In the High Frequency (HF) field, the primary power standard is maintained through reference sensors calibrated in terms of effective efficiency η_e. These devices are in turn used to transfer the power standard by means of direct comparison on the same matched generator. For this kind of operation, the only knowledge of the effective efficiency of the device is not enough and additional parameters of the reference sensor are necessary.The paper describes the methods and techniques used at INRIM to disseminate the “HF power standard”, with emphasis to all the technical aspects involved, in order to provide a thorough explanation of the procedures implemented.     

INRIM primary standard for microgas-flow measurements with reference to atmospheric pressure

Primary standard flowmeters are developed for the calibration of leak devices used in many applications in which is necessary to detect and quantify gas leakage from a material, a component or a system. At INRIM, a primary standard was designed and realized for the measurement of molar gas flow from 4 × 10⁻¹⁰ mol/s to 2 × 10⁻⁷ mol/s with reference to atmospheric pressure. It is based on the constant-pressure–variable-volume method and is able to work with any tracer gas.     

液态物料定量灌装机计量标准装置测量不确定度的评定及验证

本文介绍了液态物料定量灌装机计量标准的测量不确定度评定及测量不确定度的验证.仅供参考.     

Recent renovations of dead-weight type force standard machines at NMIJ

The older-generation dead-weight type force standard machines (DWMs) at the National Metrology Institute of Japan (NMIJ) were recently renovated with four aims: improving calibration uncertainty, enabling calibrations conforming to the latest standard, automating the calibration work, and reducing maintenance costs. Calibration uncertainties have been improved by removing eccentricity due to the incomplete tare balancing mechanism of the older 20 kN DWM and by eliminating extrapolation of calibration forces from kgf to N in the 54 kN DWM. Insufficient dead-weight division of the 54 kN DWM has been reformed to enable 8-step calibrations, along with expansion of its capacity to 100 kN. Working efficiency has been improved by automating dead-weight actuation and rotational position changes of force measuring instruments. Maintenance costs and labor have been reduced by electrifying the dead-weight actuation mechanism in the 54 kN DWM.     

Metrological characterization of the new 1 MN force standard machine of NPL India

Since November 2010, NPL India’s force scale has been complemented in the range from 10 kN to 1 MN by a further force standard machine. This automatically working 1 MN force standard machine utilizes a lever amplification of a 100 kN mass stack and enables low relative expanded uncertainties of smaller than 9 × 10⁻⁵ on the lever, and 2 × 10⁻⁵ on the deadweight side. In this paper, the constructional design of the machine is described. According to the new EURAMET Calibration Guide, a model for the uncertainties is developed.Supplementary to this, results from comparison measurements of the new NPL India machine with PTB´s force standard machines are presented.     

CQSSJ-1标准信号发生器在DYYZII型采集器校准中的应用

自动气象站主要由数据采集器和气象要素传感器构成,其误差主要来源于传感器的测量误差和采集器的转换误差。传感器可通过气象计量标准器进行检定或校准,理论和技术比较成熟;而采集器的检测和校准则比较复杂。文章介绍了一种CQSSJ-1标准信号发生器,用于DYYZII型采集器的校准,为采集器的现场校准提供了方便。     

工作标准灯组的再标定

对埃及国家标准化研究所使用的由欧思朗公司生产的标准工作灯进行了再标定,同时完成了相关的不确定性扩大的预算.用一个积分球、一个标准测光仪、五个由英国国家物理实验室标定的25-200 W的光通量标准灯组成的试验装置对埃及国家标准化研究所的五个工作标准灯进行了测量和再标定,使之保持国家级的测量水平.     

基于伏-安法测量不同直流标准电阻器的电流依赖性参数

电流依赖性参数和电阻值的稳定性对直流标准电阻器的准确测量是非常重要的。本文利用伏-安法来测量四种不同标准电阻器的电流依赖性参数,并获得了不同电流下它们的电阻值稳定性。研究表明, CDC 与电流值、测量时间及电阻类型有很大关系。     

UG环境下汽车制动产品标准件数据库的建立

提出了一种全新的汽车制动产品标准件数据库的实体模型和构建方案，并介绍了该标准件库的存储方式及调用方法，为汽车制动产品的设计开发提供了一种快速、有效的手段。     

基于作业的标准成本差异分析

为解决传统标准成本管理粒度较粗、差异分析的准确性和合理性存在不足的问题,提出一种基于作业的标准成本,阐述了基于作业的成本差异分析原理,提出作业差异的概念以便分析实际生产工艺变化导致的差异,并建立了基于作业的成本差异计算模型和分析模型。采用决策树CA．5算法研究了各种因素对成本差异的影响,根据生成的决策树提取控制成本的有意义的指导性规则。通过钢铁企业的应用实例,验证了基于作业的成本差异分析的有效性。     

标准咨询服务探讨

通过对标准化咨询服务各种模式的具体阐述，论证了其对企业发展的重要作用，以及信息化在标准服务中的的重要地位。