labview虚拟示波器设计

NI Labvie w Abstract Along with the computer technology and software technology is developing rapidly and the electronic computer in real time data analysis and processing storage show the advantages of the compared with traditional instruments is more and more obvious Meanwhile along with the computer cost effective rising the price of traditional instruments plus high and long term single function of traditional instruments development virtual instrument has become an irreversible historical trend The United States in this kind of environment in NI pioneered the research and development of virtual instrument he launched a Labview software development platform This topic on the concept of virtual instrument the structure the development trend for the correlation analysis Introduces and signal processing related basic knowledge mainly Fourier transformation Virtual instrument mainly by the hardware and software two parts In this paper the hardware that virtual oscilloscope data acquisition card of initial slightly and discusses its software as part of a deep analysis Virtual oscilloscope software is divided into several relatively independent modules such as spectrum analysis module storage module display module filter modules etc Key words virtual instrument virtual oscilloscope Spectrum analysis data collection I AbstractII 1 4 1 1 4 1 2 4 1 3 4 1 4 2 1 5 2 2 Labview 3 2 1 labview 3 2 2 labview 5 2 2 1 5 2 2 2 6 2 2 3 7 3 8 3 1 8 3 1 1 8 3 1 2 9 3 2 11 3 2 1 12 3 2 2 12 4 14 4 1 15 4 2 16 4 3 17 4 4 19 4 5 22 5 24 5 1 24 5 2 24 5 3 25 6 26 27 1 1 1 PC 1 2 PC DAQ GPIB VXI 1 3 1 2 3 4 5 1 4 National Instruments Corp NI 1986 NI 80 HP Tektronic Racal NI 21 50 NI Labv iew Labwindows CVI Labwindows C 1 5 PC 1 2 Labview 3 4 5 6 2 Labview 2 1 labview Labview G Graphics Language 1992 8 labVIEW2 5 MaCintosh Windows LabVIEW3 0 LabVIEW 1 2 G 3 VI 4 LabVIEW 1 2 windows ShowDiagram 3 LabVIEW VI LabVIEW Find 2 1 Labview 2 2 Labview 2 2 labview labVIEW VI Too1s Controls Functions 2 3 2 2 1 VI windows ShowToolsPalette VI 2 2 2 2 4 LabVIEW Wind s ShowControlsPalette 2 2 3 2 5 2 6 LabVIEW 1 0 Windows Show Funetionspalette Vl VI LabVIEw LabvIEW 3 3 1 3 1 1 RTDs 3 1 2 1 2 1 ADC 2 3 4 5 3 1 4 1 a 4 1 b 2 A D ADC ADC 3 ADC 2 8 000 In 16 655536 4 ADC DAQ ILSB DAQ 16 0 1OV 100 1LSB 10 100 xZ 6 1 5 v 1 spv 5 DAQ DAQ 6 I 0 4 CPU DMA N DAQ N1 3 2 DAS DataAequisitionSyst m A D 4 2 A D A D 3 1 3 2 1 A D A D A D 4 3 3 2 3 2 2 A D 3 3 4 4 LF13508 8 51 58 D EN EN 0 EN 1 3 4 3 5 4 FFT FFT LabVIEW 1 2 A B A B A B A T1 a0 4 1 an 4 2 bn 4 3 n 1 2 x t 4 4 x t DAQ A D l XS i XS x t DAQ T 0 T ZT x t x t xs i i 0 1 2 x t X 1 T S 2 T S 2S ms X T m o x t X 1 T T T m 1 s 2 T 2 iT i 0 1 2 T S 2 T S m S 2 m m T S 2 T 2 m m 1 X X x t S 4 20 m S S 2 m S X T m 1 m 0 X T 3 DFT 4 5 4 6 i 0 1 2 n N k 2 NT 4 7 4 8