基于LabVIEW的压力传感器自动检定系统设计

运用虚拟仪表设计工具LabVIEW开发压力传感器自动检定系统,依据JJG860-2015《压力传感器(静态)计量检定规程》和JJG882-2004《压力变送器计量检定规程》,通过计算机对PACE6000气体压力控制器及KEITHLEY2000数字多用表、CONST系列智能数字压力校验仪实现控制、采集、误差计算和生成检定原始记录和证书,并实施数据库管理,存储检定工作直线方程,以便下一检定周期的周期稳定性计算。该系统实施后实现了各检定环节的整合集成,从技术上杜绝人工抄录出错,优化检定流程,提高效率,为计量检定工作提供了有力的技术支持。     

企业在线计量仪表实施现场检定(校准)之设想

当前 ,我国工业企业技术进步的步伐越来越快。企业生产自动化水平的提高 ,给其装备的计量仪表的检定（校准）提出了更高的要求。然而 ,我国目前所制定的各类计量仪表的检定规程 ,绝大多数要求被检仪表在检测室里（在标准的检测条件下）完成检定（校准） ,这对确保仪表检测的准确度是很必要的。但是 ,从企业当前计量工作的实际来看 ,在实施周期检定过程中 ,经常遇到仪表不易拆卸、安装 ,甚至有些仪表在拆装过程中极易损坏 ,从而给计量检定（校准）工作的开展带来困难。这也是大型企业普遍存在的一个共性问题。如何解决 ,使企业计量工作能更好…     

浅谈新时期关于压力表的计量检定分析

压力表是以弹性元件为敏感元件,测量并指示被测量对象压力的仪表,主要应用于液体、气体、蒸汽压力和真空的测量,广泛用于工业流程和科研领域。压力表的检定是指根据国家计量检定规程,对压力表的计量性能进行测试并评价的过程。本文通过对压力表检定及检定过程中常见问题处理方法的探讨,愿能为压力表检定工作者提供一些参考。     

水流量仪表在线校准方法探讨

水流量仪表作为一种计量器具，按照《计量法》的规定必须在一定的周期内进行检定或校准。然而流量仪表在有些使用场所不能离线校准定期检定，如大型输水管不允许停役。针对水流量仪表无法离线送检的情况，本文介绍水流量仪表在线校准的一种方法，以解决我们现在无法现场检测的难题，供大家参考。     

浅析压力表检定及常见问题的处理

压力表是以弹性元件为敏感元件,测量并指示被测量对象压力的仪表,主要应用于液体、气体、蒸汽压力和真空的测量,广泛用于工业流程和科研领域.压力表的检定是指根据国家计量检定规程,对压力表的计量性能进行测试并评价的过程.本文通过对压力表检定及检定过程中常见问题处理方法的探讨,愿能为压力表检定工作者提供一些参考.     

实施在线计量器具管理推动“三率”稳步提高

一、做好在线计量器具的台帐管理经过几年计量检测体系的运行 ,我公司现已形成了一套科学有效的在线计量器具台帐的动态管理方法 ,其准确率≥９９ %。在线计量器具台帐由仪表车间负责管理。并由管理科室、仪表车间、周转库三者之间组成一个计算机闭环管理网。主管科室根据测量对象的重要性把计量器具分为Ａ、Ｂ、Ｃ三类 ,分别确定其检定周期。用于对外贸易结算、安全防护、环境监测等列入国家强制检定的测量设备 ;用于内部核算的能源、物资管理且准确可靠性要求高的测量设备为Ａ类。用于生产工艺控制、质量检测等有计量检测数据要求的测量设…     

关于提升基层计量仪器管理方面新认识

油田基层的计量仪表种类繁多,外观各异,检定周期不同;同时由于野外作业或现场工况差,造成仪表的损坏和报废率居高不下。如何管理这些仪表,使它们在检定周期和使用周期中,在现场中发挥最大作用？本文结合基层生产特点,阐述了仪表管理方面的一些新认识。     

测温仪表检定周期的合理确定

目前,从事热工计量的人员对如何合理确定测温仪表,如:电子电位差计、动圈仪表和工业用热电偶等的检定周期(指使用单位内部规定的检定周期,下同)重视不够,往往造成因测温仪表的故障而报废产品,或者因检定周期选择不当致使人力和财力浪费。在此,介绍测温仪表检定周期合理确定的主要原则和方法。首先,应对被检定仪表的稳定性和可靠性进行考察,只有在该仪表的两项性能指标均好的情况下再按下述方法合理确定检定周期。     

预测技术在计量检定工作中的应用

我厂每年需检定的计量仪表达7000余块之多,由于新表入库实行批量检定,又由于计量仪表按周期检定,因此,每年都不免出现多个送检高峰。在这些高峰期,为了不耽搁生产单位的计量工作,我们必须将全部精力投入到计量检定工作中去。但在这其间,若出现仪表配件短缺、人员培训、校验设备检修、计量标准送检等情况,就会造成各生产单位送检的计量仪表得不到及时检定,影响到生产单位的计量工作。     

高精度移动式付油仪表检定装置的设计

设计的高精度移动式付油仪表检定装置主要用于对在线液(油)体流量计的检定和核查,是实验室检定装置的外延,解决了无法拆卸仪表的检定工作。适用于有关计量检定部门、企业计量检定站、石油、化工等检定系统作为流量传递标准、检测、标定、校准的计量设备。     

Monitoring the calibration status of a measuring instrument by astochastic model

The paper discusses a class of stochastic models for evaluating the optimal calibration interval in measuring instruments. The model is based on the assumption that the calibration status of a measuring instrument can be monitored by means of one observable parameter. The observable parameter is undergoing a stochastic drift process. The paper introduces and compares stochastic drift models of different nature, and estimates the first passage time of the monitored parameter on a preset limit. The calibration interval is determined as a suitable percentile of the distribution function of the first passage time. A preliminary validation of the model, based on a sample of experimental data collected on a class of instruments, is finally reported     

拉拔类检测仪器及检测方法研究

拉拔类仪器主要用于建筑行业的各项参数检测,其准确度关乎建筑行业的安全性,更准确的校准该类仪器是计量部门的重要任务,本文主要介绍拉拔类检测仪器的结构和工作原理,以及探讨各种拉拔类检测仪器的校准方法,并对校准方法进行总结。     

频率计“时间间隔”参数自动校准的方法研究

主要介绍了利用新研制的通用仪器综合校准系统 ,在实现频率计类仪器“时间间隔”参数自动校准时 ,对相关仪器连接、校准方法以及软件设计等问题 ,提出了一种间接测量单线时间间隔的方法。     

Determination of the volume scattering function of aqueous particle suspensions with a laboratory multi-angle light scattering instrument

We describe a methodology for determining the volume scattering function β(ψ) of aqueous particle suspensions from measurements with a laboratory multi-angle light scattering instrument called DAWN (Wyatt Technology Corporation). In addition to absolute and angular calibration, the key component of the method is the algorithm correcting for reflection errors that reduce the percent error in β(ψ) from as much as ~300% to <13% at backward scattering angles. The method is optimized and tested with simulations of three-dimensional radiative transfer of exact measurement geometry including the key components of the instrument and also validated experimentally using aqueous suspensions of polystyrene beads. Example applications of the method to samples of oceanic waters and comparisons of these measurements with results obtained with other light scattering instruments are presented.     

Empirical likelihood confidence intervals for the endpoint of a distribution function

Estimating the endpoint of a distribution function is of interest in product analysis and predicting the maximum lifetime of an item. In this paper, we propose an empirical likelihood method to construct a confidence interval for the endpoint. A simulation study shows the proposed confidence interval has better coverage accuracy than the normal approximation method, and bootstrap calibration improves the accuracy.     

Simple measurement of the AC transport current loss for HTS conductors using an active power detection method

Reducing AC loss in a superconducting apparatus is one of the most important issues, and the precise measurement and estimation of AC losses are essential to reduce them. The four-terminal method is universally used as an electric measurement method of AC losses for superconducting tapes and wires. In this method, noise and inductive voltage superposed on the terminal voltage of the superconductor are eliminated by a lock-in amplifier and cancel coil, respectively, and then measurement of very small resistive voltage is achieved. However, using this conventional method, a plurality of measuring instruments and apparatuses are needed, and therefore the measuring system becomes complicated and much time is consumed in the calibration process. In this paper, we present a simple and precise measurement system based on an active power detection method, which is proposed as a quench detection method. The proposed system consists of a small number of instruments and apparatus and is less susceptible to noise. Its usefulness is verified by comparing the proposed method and the conventional four-terminal method in measuring the AC transport current loss of a Bi2223/Ag tape.     

Method of improving the functioning quality of an installation equipped with measuring instruments

A method is proposed for monitoring the measuring instruments with which an installation is equipped and on whose reliability the quality of its work depends. Moreover, the measuring instruments are not demountable and consequently cannot be removed for periodic calibration. Provision should be made for the proposed method when installing the equipment.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 5–7, April, 1995.     

ARINC825总线校准方法研究

为解决航空ARINC825总线设备在高速传输模式下的校准问题,针对总线发送与接收特性提出了校准项目及方法,通过常用标准器将总线设备的各项参数溯源至国家基准,达到确保总线端口参数量值统一的目的,并且为ARINC825总线设备的校准提供方法依据。     

运用PCA的多变量实验系统控制限确定方法研究

鉴于目前大部分校准实验室在提高校准结果质量方面较少考虑校准用计量器具自身的性能对校准结果的影响.在对采用常规控制图的方法进行实验室校准过程控制研究的基础上,提出了应用于在多种稳定工作状态下的计量器具校准结果监控控制限设定的方法.方法通过对系统不同变量的历史数据进行分析,获取系统变量的经验分布,然后划分系统变量的状态范围,最后利用主成分分析法确定平方预测误差的控制极限.实验表明,方法有效保证了实验室校准结果的质量控制.