Using interchangeable virtual instrument (IVI) drivers to increasetest system performance

Instrument driver technology has evolved tremendously over the last decade. Initiatives such as SCPI and VXIplug&play have simplified remote instrument programming with standardized command messages and high-level utility functions. The latest initiative is the Interchangeable Virtual Instrument (IVI) Foundation. IVI defines standards for instrument drivers that offer benefits to provide higher performance. These benefits include instrument interchangeability, instrument simulation, and instrument state-caching. Because instrument drivers are an integral part of a modern test system, IVI promises to provide developers with the tools to increase their system performance significantly. This paper reviews the technical aspects of the IVI specification and the TVI architecture and describes how IVI can help the test system developer improve performance and lower long-term software maintenance costs     

Software architecture for building

Test system developers can benefit greatly from a software architecture that allows for easy interchangeability of instruments in those systems. Using open industry standard software architectures such as Virtual Instrument Software Architecture (VISA), and Interchangeable Virtual Instruments (IVI), developers are able to create systems with interchangeable test instrumentation. This paper describes the VISA and IVI software standards and demonstrates how their use within a broader software architecture, which includes standard development environments and flexible test executive software, facilitates the creation of interchangeable test systems     

建立与硬件无关通用测试程序的方法

IVI 驱动技术是当今受人推崇的软件控制新技术。文中阐述了 IVI 技术的应用,真正实现了仪器的可互换性.使得工程人员的测试程序可以应用于不同的仪器设备。文中介绍了 IVI驱动机制、使用工具、建立虚拟仪器等方面的相关问题。     

基于LabVIEW的IVI编程

在介绍IVI类驱动程序和专用驱动程序的基础上,针对测量程序控制硬件发生变化时需要耗费大量的时间和精力重新编写程序的问题,以Fluke8840A为例,描述了利用NI公司MAX软件配置IVI仪器的Logical Names和Driver Sessions的过程、方法、步骤和注意事项,及在LabVIEW开发环境下如何利用IVI驱动设计IVI数字电压表测量程序。本文对正确地利用IVI驱动设计测试系统程序、推广利用IVI技术、节省开发时间和维护成本具有重要意义。     

飞航导弹自驾仪自动测试系统的开发研究

基于虚拟仪器技术的飞航导弹自动化测试与故障诊断系统,以嵌入式工控机为核心,采用模块化仪器总线标准-PXI,集PXI卡式仪器、程控仪器和各种先进的测试诊断技术于一体,并利用自动化测试设备的硬件设施,增加了驾驶仪故障分析软件,实现了导弹自动驾驶仪故障的快速准确定位,是一套具有自动性能测试和故障诊断的综合测试系统.用于飞航导弹中电子设备的参数测量、专向性能指标测试、功能测试及故障诊断.     

IVI comes of age: An overview of IVI specifications with current status

IVI stands for Interchangeable Virtual Instruments; the IVI Foundation was formed in 1997 and is a consortium founded to promote standard specifications for programmable test instruments. The foundation focuses on the needs of users who build high performance test systems. By building on existing industry standards, such as VXIplug&play driver concepts, the Foundation's goal is to deliver specifications that simplify interchangeability, provide better performance, and maintainable test programs. To date, only a few IVI drivers have been available. In the past year, the IVI Foundation finished a major revision of it's architecture and has released a blizzard of specifications, increasing its IVI Class specification by 80% and dramatically improving the consistency and quality of released drivers. The DoD has expressed major interest in IVI's success. With the recent successful completion of the current set of specifications, DoD is interested in becoming involved in defining the next set of Class Specifications. The NxTest Working Group lists IVI as a key technical element, and DoD has recently requested that the IVI Foundation consider Electro Optical equipment for their next set of Class Specifications; a Working Group has been formed to more clearly define this activity.     

Specifying an IVI class for digital test instrumentation

This paper presents an overview of work being done by Teradyne in conjunction with the IVI Foundation to specify an IVI class for digital instrumentation. The Interchangeable Virtual Instruments (IVI) Foundation was formed in August 1997 to define standard specifications for programming common test instrument capabilities. The paper will present the major architectural aspects of digital test instrumentation and how those features can be grouped into classes for the purpose of writing an instrument independent driver. Topics discussed will include derivation of capability classes, class extensions, simulation, and range checking. Examples of how the IVI digital class would apply to the Teradyne M9-Series Digital Test Instrument will be included. Conclusions will summarize the unique attributes of digital test instrumentation, the benefits which can be achieved through standardization, and the tradeoffs associated with utilizing class extensions     

气象雷达综合测试系统的设计与实现

以某系列雷达为研究对象,详细介绍了基于PXI总线雷达综合测试系统的硬件组成和软件设计方法,并详细阐述了组建雷达综合测试系统过程中重点、难点的实现方法。实际应用表明：该系统具有通用性强、扩充性好、可靠性高等特点。     

Software architecture requirements for DoD automatic test systems

The DoD has achieved success with recent automatic test equipment (ATE) families, as evidenced by the navy's consolidated automated support system (CASS) and the army's integrated family of test equipment (IFTE) programs. However, as these systems age, the increased requirements for technology insertion due to instrument obsolescence and the demands of advanced electronics are becoming evident. Recent advances in test technology promise to yield reduced total ownership costs (TOC) for ATE which can incorporate the new technology. The DoD automatic test system (ATS) executive agent office (EAO) objective is to significantly reduce total ownership cost. Several objectives have been identified including use of synthetic instruments, support for legacy test product sets (TPSs), and more efficient ways of developing TPSs. The NxTest software architecture will meet the objectives by providing an open systems approach to the system software. This will allow for the incorporation of commercial applications in the TPS development and execution environments and support current advances in test technology     

基于PXI总线的机载计算机通用测试系统的设计和实现

以通用机载计算机的维护和测试为目标,采用目前国际测控领域流行的PXI总线结构和LabWindows／CVI虚拟仪器软件开发平台,设计和实现了机载计算机通用测试设备。本文在介绍PXI总线结构的基础上,重点介绍了该测试设备的软／硬件组成、系统功能和特点。     

机载计算机测试系统的设计和实现

以通用机载计算机的维护和测试为目标,采用目前国际测控领域流行的PX I总线结构和LabW indows/CVI虚拟仪器软件开发平台,设计和实现了机载计算机通用测试设备。本文在介绍PX I总线结构的基础上,重点介绍了该测试设备的软/硬件组成、系统功能和特点。     

VXI or PXI test system improvement using DSP

The results of a study into the use of distributed digital signal processing (DSP) at the instrument level in a VXI and PXI based test system and the effects on test time. One of the limiting factors in testing mixed signal or analog devices using standard bus based instruments is the transfer speed from the instrument to the controlling computer of large amounts of waveform data. This is important as these types of tests use non-deterministic, quantized signals that must be mathematically processed to extract test information. This processing can either be done at the instrument or at the central controller. If the processing is done at the instrument then only the results are transferred to the controller. If the controller does the processing then the raw data must be transferred to and from the instrument. Using two instruments, one in VXI and one in PXI, this paper measures the effects of typical tests contesting the measurements as done in the central processor as opposed to a distributed DSP processor in each instrument For each acquisition instrument, tests were implemented by capturing the data and moving it to the controlling computer where it was processed to extract test results, or by using the instruments on-board DSP so only the final test results were set to the controlling computer. The study results show that a significant improvement in test time can be made by selecting "smart" instruments for the test system when using PXI or VXI based instruments.     

基于虚拟仪器技术的某航电计算机测试平台构建

虚拟仪器是基于计算机和标准总线技术的一种全新仪器概念,结合某航电计算机的测试需求及PXI总线特点,构建了基于PXI技术的虚拟仪器作为设备综合测试平台,对该综合测试平台的建立原则进行了概括,对设备开发过程进行了描述,介绍了设备的总体结构、PXI总线测试资源的选用方法和信号调理电路的典型设计,同时,对测试设备的软件结构和测试流程进行了说明.该系统的开发结合PXI总线优势,在满足专用测试要求的基础上具有良好的开放性;该设备的研制对数据采集、测试和控制系统的设计具有一定的借鉴意义.     

基于PXI及GPIB总线的自动测试系统设计

通过使用自动测试设备来代替大量专用测试设备,不仅可以降低成本,而且可以有效的提高测试效率.介绍了基于PXI总线和GPIB总线的自动测试系统设计,从硬件和软件两个方面详细说明了系统的设计方法.系统具有模块化、层次化和开放式的特点,便于维护和升级.     

船载测控设备远程测试标校系统设计与实现

远洋航天测控事业的不断发展,对测控设备的远程测试标校和故障诊断提出更高的要求。目前。船载测控设备配备了大量的智能测试仪器,为建立船载测控设备自动化测试标校系统提供了有利条件。此外基于PXI总线的虚拟仪器技术的广泛应用,也为未来航天测控设备的自动化测试提供了新途径。本文主要探讨了船载测控设备远程测试标校系统的主要设计思想和实现方式。     

面向功能的测试设备驱动器设计与实现

在各种定制化测试设备中,由于很多仪器驱动不符合现有的标准,从而降低了测试软件的开发效率和质量。为此,提出了一种面向功能的测试设备驱动器的设计与实现方法。通过对特定类别测试设备所需实现功能的分析,获得了脱离硬件环境的功能项目集合,并建立了规范化的设备驱动接口。在驱动组件的内部,封装了对硬件仪器的控制,并描述了实际测试设备的功能实现。测试设备驱动器为上层软件提供了统一的开发和运行基础,便于测试程序针对这些虚拟化的功能接口进行开发,避免了硬件的差异性对业务逻辑的影响。应用实例表明,该方法提高了测试程序的移植性和开发质量,尤其适用于各种系列化的、含有非标准驱动程序的测试软件的开发。     

用于虚拟仪器开发的IVI技术

介绍了IVI的规范及体系结构，描述了IVI仪器驱动器的工作过程及特点，重点讨论了开始开发IVI仪器驱动程序器的方法。     

PXI总线在机载计算机测试系统中的应用

以通用机载计算机的维护和测试为目标,采用目前国际测控领域流行的 PXI 总线结构和 LabWindows/CVI 虚拟仪器软件开发平台,设计和实现了机载计算机通用测试设备。在介绍PXI 总线结构的基础上,重点介绍了该测试设备的软/硬件组成、系统功能和特点。     

一种基于PXI总线的自动测试系统研制

日益复杂的电子产品的综合测试需求,使得传统测试设备的应用面临难题。利用虚拟仪器技术及Lab-VIEW开发平台,开发了一种基于PXI总线的自动测试系统(ATS),从硬件和软件方面说明了系统的设计原理和实现方法,重点介绍了接口适配器的设计和基于专家系统的故障诊断方法。系统具有良好的人机交互界面,在使用过程中运行稳定可靠、测试效率高、使用维护方便。     

基于LabVIEW的角振动台频响测试系统实现

介绍了一种由角振动台和PXI虚拟仪器测试构成的惯性器件频响特性测试系统,并介绍了LabVIEW软件开发平台在本系统中的应用与开发.