Design And Realization Of Reconfigurable Virtual Electronic Measure Instruments System

The disadvantages of conventional test systems, such as incompatibility with each other, bad augment ability, shortage of unification and modularization, fail them to share with hardware and software components, which can hardly improve the developing efficiency and result in high cost to develop a complex test system, with a great of waste.At the present time, the experimentation level in many colleges of science and technology still stays at simulation phase, while the students can't learn more unless they experience the practical operating process and a set of fitting experimental platform is needed badly.Against above problems, a set of reconfigurable virtual electronic measure system contains signal generator, data acquisition and data analysis & process, has been developed. This development has achieved the aim that one system replaces more laboratories, not only reducing the cost of test teaching, but also advancing into the combination of teaching test and practical engineering from the simulation experiment. What's more, graphical software development environment and abound data processing packages supply best support for the experimentation.The reconfigurable virtual electronic measure instruments system is divided into hardware platform and software platform. The hardware platform adopts modular design method to modularize some general purpose test instruments though a special specification. And then integration them into a 3U size cabinet though personal bus. The function-modules are controlled by the system controller, which communicates with computer through USB2.0 interface. The software platform adopts graphic virtual instrument software LabVIEW, which uses CLF node to interface with instrument driver. The instrument driver packages the I/O operation into function by DLL and it calls USB driver to achieve data in and out.This paper mainly includes the contents of the three parts: firstly, with a brief introduction to the research situation and prospect of test system and electronic instrument measurement, the framework and general design program of the reconfigurable virtual electronic measurement instrument system has been established, on the basis of existing test system and reconfigurable techniques, secondly, the design of modularized common test instrument have been described in detail; finally, with the application of reconfigurable thought, based on the signal generation model and the signal acquaint model, the spectrum analyze instrument and frequency characteristics test instrument have been designed, as well as the verification of the systemic reconfigurable.Chapter 1, is an introduction, simply introduces the development of test techniques and electronic test instrument, and then the study aim, meanings and main content being expressed as well.Chapter 2 studies the instrument reconfigurable techniques, introduces both of instrumental hardware and software reconfigurable techniques, and summarizes its characteristics that it should have.Chapter 3 is total design of the system. Based on the research of auto test system and instrument reconfigurable techniques, systematic general structure has been established, and determined to apply FPGA hardware reconfigurable and the software reconfigurable of virtual instrument for the development of this system. Based on the analysis of existing virtual instrument software development environment, the development of application program adopts graphic virtual instrument software LabVIEW.In chapter 4, DDS signal generator model and the data acquaint model are introduced, which is emphasized on the design process of typical module test instrument.Chapter 5 includes two parts. First part makes use of module reconstruction of signal generation and signal collection to meet different test requirements. And then, in the second part, chirp wave generation, spectrum analysis and frequency characteristic test have been achieved, based on the software and hardware reconfigure of two boards.Chapter 6 is the conclusion of this paper, which summarizes the study findings and prospects the works needed to be done here after.