出租汽车税控计价器电快速瞬变脉冲群抗扰度试验的方法

本文针对《出租汽车税控计价器定型鉴定大纲》第 5 .9.2 .3款和第 7.9.2 .3款电磁兼容试验中规定的电快速瞬变脉冲群抗扰度方法提出了具体实施和操作性较强的试验方法。     

电快速瞬变脉冲群抗扰度试验

在电磁兼容测试中，电快速瞬变脉冲群（EFT）抗扰性测试常常给电子产品工程师和测试人员带来困扰，下文主要从测试和整改两方面对它进行介绍。     

出租汽车税控计价器射频电磁场辐射抗扰度试验的方法

本文针对《出租汽车税控计价器定型鉴定大纲》第 5 .9.2 .2款和第 7.9.2 .2款电磁兼容试验中 ,规定的射频电磁场辐射抗扰度试验提出了具体实施和操作性较强的试验方法     

如何正确判断电能表电快速瞬变脉冲群抗扰度试验的结果

本文通过实例分析 ,对《全电子式电能表定型鉴定大纲》第 5 4 3条a款试验提出补改意见     

出租汽车税控计价器检定的几点建议

近年来，随着各大中城市的出租汽车税控计价器的推广使用，出租汽车税控计价器的检定已是我们计量工作者不得不考虑的问题。为此我们对出租汽车税控计价器的检定提出一些个人的观点，供同行参考。     

电能表电快速瞬变脉冲群检测装置研究

针对电能表电快速瞬变脉冲群抗扰度试验,给出一种用于电能表电快速瞬变脉冲群检测装置,设计了一种用于本装置的反馈干扰滤波网络,该网络对电能表电快速瞬变脉冲群抗扰度检验装置产生的反馈残压减少到电能表标准检定装置所能允许的范围之内,使得电能表电快速瞬变脉冲群抗扰度试验顺利进行。     

KW型衰减器校准电快速瞬变脉冲群发生器方法研究

电快速瞬变脉冲群发生器是脉冲群抗扰度试验中的主要设备,为了确保发生器的性能特性参数测量准确,提出用KW型衰减器校准电快速瞬变脉冲群发生器的方法以及校准时应注意的一些要点。     

税控收款机射频场感应的传导骚扰抗扰度试验方法

GB18240．1—2003《税控收款机》国家标准第5．8．2．4款要求传导骚扰抗扰度按GB／T17618—1998中第4．2．3．2的规定进行，试验等级为3级。GB／T17618—1998中第4．2．3．2款要求传导骚扰抗扰度按GB／T17626．6规定进行。GB／T17626．6是射频场感应的传导骚扰抗扰度试验的通用标准，对具体的电子产品．应该选择与其典型应用情况相符合的、最有代表性的、使该电子产品主要功能都运行的工作方式，试验样品按这种典型工作状态进行试验。上述国家标准中没有规定税控收款机在试验中的典型工作方式，因此在具体试验中很难操作．     

电子式电能表抗扰度试验原理与方法浅析

一个能开展六项试验的电磁兼容(EMC)系列试验装置已在我院建成，能完成电能表、水表及煤气表等能源计量仪表的EMc抗扰度试验，能为用户提供试验、咨询和整改等一条龙技术服务。本文阐述其试验原理、方法和技术关键；并以脉冲群试验为例探讨其满足国际和国家标准要求的试验方法。     

出租汽车计价器本机计程测量结果不确定度的评定方法

本文简要介绍了出租车计价器本机检定装置的用途,组成和对环境条件的一般要求,详细论述了本机计程测量结果不确定度的评定方法,并对测量结果标准不确定度进行了验证.     

出租车计价器不计里程的故障判断和修理方法

本文介绍了出租车计价器不计里程的故障判断和修理方法。     

浅谈如何准确修正计价器常数"K"值

本文主要介绍出租汽车计价器使用误差超差原因及计价器常数“K”值的修正与计算方法.     

Deep-Level Spectroscopy by Transient Capacitance Techniques under Electrical Resonance

Transient capacitance studies for deep-level spectroscopy are suggested to be performed under electrical resonance conditions. Variable-frequency impedance bridges allow work at resonance, and an incremental gain for capacitance transients is obtained. This new method is presented and a few examples are discussed.     

关于JJG(粤)019-2014纸与纸板耐破度仪检定规程检定方法的说明

影响纸与纸板耐破度仪示值准确度的因素比较多,虽然此前有地方或者部门规程做为指导,但是我们在检定或校准过程中,往往过分关注其压力示值准确与否,而忽略其他因素。本文在JJG(粤)019-2014纸与纸板耐破度仪检定规程的基础上,介绍检定此类仪器的一些问题。     

A Transient Method for Total Emissivity Determination

A transient method for determining the hemispherical total emissivity of solids is investigated using an emissometer recently developed at the NPL. The emissivity is calculated from measurement of the sample surface temperature coupled with a knowledge of its bulk thermal properties. This was conducted as part of the current work to validate the new NPL apparatus for high temperature emissivity measurements. A theoretical study shows that when a thermally thick sample is allowed to radiate instantaneously into a cold environment, then the resulting transient surface temperature depends solely on its hemispherical total emissivity and effusivity. This approach is used to obtain a hemispherical total emissivity value for Fecralloy steel, and it is then compared with the normal total emissivity value obtained by integration of normal spectral emissivity measurements in the wavelength range 2 to 9m.     

无源光网络中突发光功率计校准方法的研究

介绍了一种利用连续光功率计和示波器进行突发光功率计校准的方法,设计制作了稳定度为±0.01dB/15 min的脉冲光源,通过将脉冲功率的直接测量转换为平均功率的间接测量,实现了突发光功率量值的有效溯源。给出了不确定度评定方法,在0.1 dB分辨力条件下测量不确定度达到0.2dB(k=2)。该方法和装置被广泛用于无源光网络突发光功率计的校准,保证了实际工程中突发光功率测量的准确性。     

Fast Transient Current Response to Switching Events in Short Chains of Molecular Islands

We consider current flow between two metallic leads joined by tunneling junctions to a molecular island. The junctions are assumed to be “wiggly,” that is, switching on and off intermittently. The resulting sequence of current transients overlaps in dependence on the interplay between the switching times and the decay time of “initial” correlations induced by each switching event. The process is described in terms of nonequilibrium Green’s functions.     

Thermophysical Analysis of Sandstone by Pulse Transient Method

Stones belong to porous materials where water in pores plays an important role during the freeze–thaw process. A thermophysical analysis based on the pulse transient method has been used to study an ageing cycle, namely the freeze–thaw cycle. Thermophysical analysis is based on measuring the thermophysical properties under specific thermodynamic conditions. The transient method determines the specific heat, thermal diffusivity, and thermal conductivity by a single measurement. A specimen of Sander sandstone was analyzed in both dry and water-saturated states. Typical anomalies of all thermophysical parameters at the freeze–thaw point as well as differences for the dry and saturated states were found. The changes of thermophysical parameters measured when using freeze–thaw cycles correspond to stone ageing. The freeze–thaw cycle can often be encountered in building physics, concrete construction, etcPaper presented at the Seventh Asian Thermophysical Properties Conference, August 23–28, 2004, Hefei and Huangshan, Anhui, P. R. China.