基本自动化测试系统的建立
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Software-Defined Test
Fundamentals Understanding the Architecture of Modular, High-Performance Test Systems
Contents
Executive Summary ___________________________________________________________ 4 Architecture Layer No. 5: System Management/Test Executive _____________________________ 5 Architecture Layer No. 4: Application Development Software ______________________________ 6 Architecture Layer No. 3: Measurement and Control Services ______________________________ 7 Architecture Layer No. 2: Computing and Measurement Bus_______________________________ 8 Architecture Layer No. 1: Measurement and Device I/O __________________________________ 9
Chapter 1: Developing a Modular Test Software Framework _________________________ 10 National Instruments Modular Test Software Framework ________________________________ 10
Chapter 2: Choosing the Right Software ADE for Your Automated Test System ___________ 13
Factors to Consider When Selecting an ADE ____________________________________________ 13
NI LabVIEW ______________________________________________________________________ 15
NI LabWindows/CVI _______________________________________________________________ 18
Microsoft Visual Studio .NET (C++, Visual Basic .NET, C#, and ) ______________________ 20
Chapter 3: Choosing the Right Data Bus __________________________________________ 22
Understanding Bus Performance _____________________________________________________ 22
Instrument Control Bus Comparison (GPIB, USB, PCI, PCI Express, and Ethernet/LAN/LXI) _______ 24
Conclusion: Instrument Bus Performance ______________________________________________ 26
Chapter 4: Modular Instruments Basics __________________________________________ 28
Anatomy of a Modular Instrument ___________________________________________________ 29
Effects of Front End _______________________________________________________________ 31 Bandwidth _____________________________________________________________________ 31 Accuracy _______________________________________________________________________ 31
Effects of ADC/DAC ________________________________________________________________ 33 Sampling Rate __________________________________________________________________ 33 Resolution _____________________________________________________________________ 33
Instrument Types _________________________________________________________________ 36 Digital Multimeters (DMMs) _______________________________________________________ 36 Arbitrary Waveform Generators (Arbs) and Digitizers ___________________________________ 36 Dynamic Signal Analyzers (DSAs) ____________________________________________________ 36 RF Analyzers and Generators _______________________________________________________ 37
Conclusion _______________________________________________________________________ 37
Chapter 5: PXI Modular Instrumentation Platform _________________________________ 38