EE331LE0rev6 - Experiment-0 Experiment-0 Laboratory...

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Experiment-0 R. B. Darling EE-331 Laboratory Handbook Page E0.1 Experiment-0 Laboratory Preliminaries and Data Acquisition Using LabVIEW Introduction The objectives of the first part of this experiment are to introduce the laboratory transformer and to show how to operate the oscilloscope as a curve tracer, displaying either a voltage transfer curve (VTC) or a current-voltage (I- V) characteristic. Other procedures are designed to better acquaint you with the test equipment in the laboratory. The objectives of the second part of this experiment are to become acquainted with using computer-conrolled instrumentation for data acquisition. LabVIEW, a program developed by National Instruments, is the industry standard for programming computer-controlled instruments, and it will be used in this experiment as well as others to measure and record sensor readings and to characterize various electrical systems and devices. LabVIEW is a graphical programming environment. Unlike C/C++ where you write the programs in text, in LabVIEW you create a Virtual Instrument (VI) by graphically composing it from different elements and structures that you place like the blocks of a block diagram and interconnect with wires to indicate the intended signal flow paths. This is referred to as “G-code” for the graphical language that it uses. The most important aspect of understanding LabVIEW virtual instruments (VIs) is that they are data-driven, meaning that the execution of the block diagram procedes along the same path as which the data propagates through the block diagram. A new block is not executed until the new data arrives at its input. This is quite different from the event-driven programming of Windows, or the more familiar procedure-driven programming of FORTRAN, Pascal, or C/C++. A complete tutorial for programming in LabVIEW will not be presented in this laboratory handbook since other excellent references exist for this purpose. A very useful introduction to LabVIEW is provided by National Instruments and can be downloaded from their website: http://zone.ni.com/devzone/learningcenter.nsf/03f7c60f17aad210862567a900 54a26c/60c2782788a811c986256cd50001a0a6?OpenDocument . This experiment will introduce opening and running virtual instruments in LabVIEW and using it to control a data acquisition (DAQ) card for making electrical measurements. In addition, some simple modifications to the virtual instruments will be performed to gain some experience with using the LabVIEW graphical interface and programming language. These basic operation skills will be useful starting points for developing more complex data acquisition instruments in later experiments, and will form the basis for automated measurement of semiconductor device characteristics. One of the important advantages of computer-based instruments is that recording
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Experiment-0 R. B. Darling EE-331 Laboratory Handbook Page E0.2 measurement data becomes very easy, and some of this will be introduced in this experiment also. Precautions
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This note was uploaded on 09/10/2011 for the course EE 331 taught by Professor Taicheng during the Winter '08 term at University of Washington.

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EE331LE0rev6 - Experiment-0 Experiment-0 Laboratory...

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