计量检定人员的定义

正计量检定人员是指经过考核合格,取得计量检定人员证书,在计量技术机构中从事计量检定、校准或者测试工作的人员。     

波形监视器计量技术规范和检定方法编制说明

波形监视器计量技术规范和检定方法规定了计量检定波形监视器所用的仪器、设备的技术要求和主要技术指标以及正常功能计量检测的方法。适用于对各种用于PAL-D制彩色电视制式的波形监视器的检验、验收和维修后的技术指标的计量检定。本文是对规范和检定方法的说明。     

数字示波器的计量精度影响原因分析

阐述数字示波器的原理,计量形式,影响计量准确性的因素,包括上升时间、带宽、采样速率,探讨在实际计量检定的过程中,对影响因素进行更加严格控制,保证计量的准确度。     

电学计量检定和测量的系统误差因素分析

在电学计量检定以及测量过程中，造成误差的因素多种多样，如人为因素、环境因素以及电路特性等，所以，对于电学计量检定测量工作人员来说，在检定测量过程中，需要对各影响因素进行综合考量，减少误差。本文对电学计量检定测量中误差以及造成误差的原因进行分析。     

SQL触发器在气象局仪表计量检定系统中的应用

山东省气象局计量检定系统是基于ASP.NET开发的,而温度实验室和风速风向实验室都用Visual Basic开发了客户端,为了将计量检定处各实验室的仪表检定客户端融入计量检定系统,设计了SQL触发器,方便的解决了系统集成问题。     

略谈电能表的发展及计量检定

电能表是重要的贸易结算计量器具,被广泛应用于日常生产与生活,计量是否准确与电能供用双方的利益有直接关联。下面从电能表的发展入手,探讨提出若干加强电能表计量检定的措施,希望能对更好地开展检定工作有所帮助。     

浅析开展计量确认工作

目前,计量器具技术状态的确认无论是依靠传统的检定方式还是计量校准,都展现出不适合实际使用的情况。而计量确认作为一种新兴的技术状态的确认方法,正被越来越多的企业和计量校准机构所使用。该文主要探讨对计量确认工作的认识,以期对大家有一个借鉴帮助作用。     

浅析开展计苗确认工作

目前,计量器具技术状态的确认无论是依靠传统的检定方式还是计量校准,都展现出不适合实际使用的情况。而计量确认作为一种新兴的技术状态的确认方法,正被越来越多的企业和计量校准机构所使用。该文主要探讨对计量确认工作的认识,以期对大家有一个借鉴帮助作用。     

压力表计量检定中常见的不确定性因素分析

为探讨压力表计量检定中常见的不确定性因素,采用理论结合实践的方法,立足开展压力表计量检定的必要性,分析常见的不确定性因素,并提出相应的解决措施。分析结果表明,压力表计量检定是保证压力表计量精度的关键,对压力表使用效果有很大有重要作用,针对不确定性因素,采取科学合理的处理措施和方法,是保证生产安全的重中之重,值得高度重视...     

交流电能表在计量检定中的常见故障及处理方法

交流电能表是计量电能的主要工具,其计量检定的精准度直接关系着电能表的后期使用,以及用户和电力企业之间的利益关系.然而,交流电能表在计量检定当中的一些常见故障,严重影响了交流电表的使用.本文在介绍交流电能表种类的基础上,就不同类型交流电能表的计量检定故障及处理方法进行了探究.     

Sensor system optimization to meet reliability targets

In this work, we show the influence of sensor system measurement uncertainties to sensor system reliability and ways to meet reliability targets. A general model to handle measurement uncertainties is defined and the according influence to reliability is presented, which is defined as probability of meeting specification requirements. Initial step is to optimize sensor systems concerning lowest influences of sensor system parameter fluctuations to the measurement uncertainty using statistical optimization methodologies. In case the influence of unknown nuisance parameters cannot be sufficiently suppressed, such parameters may be additionally measured in order to further reduce measurement uncertainties. The remaining uncertainties are again addressed using statistical optimization methodologies. Finally, measurement uncertainty also affects the reliability of such a system. For sensor systems in safety critical applications it may thus be required to include measures such as redundancy. This is also included in the investigations. Further examples for explained optimization methodologies of measurement uncertainty reduction are presented.     

Algorithms to select I DDQ measurement points to detect bridging faults

I _DDQ measurement is a time consuming process. Thus, reducing the number of I _DDQ measurements have a great impact on the test time. Carefully selecting a few I _DDQ measurement points is therefore an important problem. This problem has been studied for detecting leakage faults but not for bridging faults. We present novel algorithms to select I _DDQ measurement points to detect bridging faults. Experimental results obtained are very encouraging. The method can also be used: by test generators to compress I _DDQ test sets; and to maximize the fault coverage when a fixed number of measurement points are given.Research supported by NSF Grant No. MIP-9102509.     

Introduction to radar cross-section measurements

This paper is intended to serve both as an introduction to radar cross-section measurements and as an introduction to the several measurement papers that follow in this issue. We discuss the contribution that experimental work makes to theoretical studies. The history of cross-section measurements is reviewed. Some terms are defined, and the major measurement problems are discussed. It is pointed out that the various range geometries and measurement techniques in use today were based on the approach used to solve the basic measurement problems. Some details are given of the more popular present-day measurement systems, i.e., CW, pulsed, FM-CW, Doppler, and the standing-wave ratio method.     

用于激光在线粒度分析的两次测量法

在实时在线激光衍射粒度测量中，观察窗玻璃上污染物对测量结果有直接影响，提出了可消除污染物影响的两次测量法。讨论了测量原理，并模拟现场颗粒状况用标准粒子进行了一系列实验，结果令人满意。     

屏蔽对阻抗测量的影响

屏蔽对抑制电磁场耦合干扰起着重要的作用.为了研究屏蔽在阻抗测量中的影响,通过屏蔽原理以及实现等电位屏蔽,了解屏蔽对电容、电感、电阻测量值影响的重要性,进而保证测量值的可靠性.     

红外线检测技术在电力系统中的应用

在带电状态下对设备过热故障进行有效检测是非常重要的。红外线测温技术是一种诊断电气设备和线路热故障的有效先进技术。阐述了带电设备发热和异常原因和红外线测温仪器的基本工作原理。给出了运用红外线测温技术的注意事项。     

网络性能测量的研究

针对不同的研究方向,文章概述了网络性能测量的基本概念和基本方法,介绍了针对性能测量的种种参数以及参数相关的研究,并对网络性能测量的下一步发展进行了展望.     

一种人体静电测量系统的设计方法与实现

静电检测是静电防护中的一个非常重要的研究内容。本文提出一种基于接触式测量和高阻测量的人体静电测 量系统设计方法,对系统中的两个主要模块的设计方法进行了详细的描述,同时对测量原理进行了阐述。     

Improvements to "A new AC measurement technique to accurately determine MOSFET constants"

Modifications and improvements to the measurement technique described in [1] are presented. In particular, the iterative procedure used to obtain an accurate value for device threshold voltage has been eliminated and replaced by direct calculation. The measurement technique has also been applied to a modulation of the substrate potential in order to obtain an estimate of threshold parameters.     

Sparse solutions to linear inverse problems with multiple measurement vectors

We address the problem of finding sparse solutions to an underdetermined system of equations when there are multiple measurement vectors having the same, but unknown, sparsity structure. The single measurement sparse solution problem has been extensively studied in the past. Although known to be NP-hard, many single-measurement suboptimal algorithms have been formulated that have found utility in many different applications. Here, we consider in depth the extension of two classes of algorithms-Matching Pursuit (MP) and FOCal Underdetermined System Solver (FOCUSS)-to the multiple measurement case so that they may be used in applications such as neuromagnetic imaging, where multiple measurement vectors are available, and solutions with a common sparsity structure must be computed. Cost functions appropriate to the multiple measurement problem are developed, and algorithms are derived based on their minimization. A simulation study is conducted on a test-case dictionary to show how the utilization of more than one measurement vector improves the performance of the MP and FOCUSS classes of algorithm, and their performances are compared.