基于高速数据采集卡PCI-6143的虚拟示波器设计

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《》2010232PCI-6143*12111(1,430074;2,430064)DesignofVirtualOscilloscopeBasedonFastData-AcquisitionCardPCI-6143,。,,。,LabVIEW,PCI-6143,DAQmx,,,、、。1。1。1,NI-DAQmxLabVIEW,、、()。1.1。。NIPCI-6143,2。2PCI-6143PGIA,(CMRR),PCI-6143。PCI-614316(ADC),,PC,。。PCI-6143,,。1.2DAQmxDAQmx。NI-DAQmx(DMA),。,,。NI-DAQmx,,。,NI-DAQmx,。,NIPCI-6143LabVIEW,PCI。、DAQmx、,。,,、,,。:,,,LabVIEWAbstractAvirtualoscilloscopedesignmethodbasedonvirtualinstrumenttechnologyhasbeenintroduced.Afastdata-acquisi-tioncardPCI-6143ofNIcorporotionisadopptedasgeneralhardware.Meanwhile,LabVIEWisemployedassoftwaredevel-opmentplatform.AvirtualoscilloscopebasedonPCIbushasbeenconstructed.Thissystemconsistsofthreeparts:dataac-quisition,DAQmx,dataanalysisandwaveformcontrol.Itcanrealizethemeasurementandanalysisoffourchannelsignals.Theprincipleofthesystemisdescribed,mainfunctionofthevirtualoscilloscopewasbrieflyintroduced.Thekeytechnologyabouttriggeranddataanalysisisdiscussedindetails.Thefunctionsoffrequency-spectralanalysisanddigitalfilteraboutrealmeasurementsignalwasshowntoo.Keywords:fastdata-acquisition,virtualoscilloscope,virtualinstrument,LabVIEW*(200850731349)2PCI61433PCI-6143DAQmxDAQAssistant。。,。,、、。DAQAssistant,DAQmx。PCI-6143,DAQmx,DAQAssistant。1.3。———LabVIEW。LabVIEW,,。,600,。EXE、。LabVIEW。,。2,:1):31,。,。32):32,,0~10。3):33,,-10V~10V。4):34,,,。5):35,0.01ms/div~10ms/div。6):35,。7):37。math,,。、。8):37,。6(3)。,,,,,()。9):37,,,,。TXT。10):37,,,。33.1NI-6143,。LabVIEW。4。4,“”,“”“”。,“”、、,“”,“”。,。“”,“”,;“”,“”“”。“”“”、、。“”。“”,,。“”,。“”,。“”“”“”。3.2CASE。,,。,CASE。CASE。LabVIEW。、、、、、()。,,。3.2.1LabVIEW,。(1):μ=1nn-1i=1Σxi(1),μ,n,xii。。(2):ψx=1nn-1i=1Σx2i姨(2),ψx,n,xi4《》2010232(2)4,CompactPCIExpress。、、,CompactPCIExpress,、、。。5PCIExpress,,,,。,,,。COMeCompactPCIExpress,。[1]PICMGEXP.0R1.0Specificatio.2005[2]PaviBudruk,DonAnderson,TomShanley.PCIExpress[M].,.:,2005[3].QuartusllFPGA/CPLD[M].:,2006[4],,.PEX8532[J].,2009,20(2):11-12,14[5],,.PCIExpress[J].,2005(3):230-234[:2009.11.30]i。3.2.2LabVIEW,。:X(k)=N-1n=0Σx(n)e-j2πNnkk=0,1,…N-1(3),x(n)x(t),N,x(k)。X(k),(4)(5)。X(k)=ReX(kΣΣ)2+ImX(kΣΣ)2ΣΣ1/2(4)∠X(k)=tan-1ImX(k)/ReX(kΣΣ)(5),ReX(k)X(k),ImX(k)X(k)。,,,(FFT)。3.2.3LabVIEW(Infi-niteimpulseresponse,IIR),。,,,,,3dB。。IIR2~4IIR。IIR:Yi=1a0(Nb-1j=0Σbjxi-j-Na-1k=1ΣakYi-k)(6),Y,Nb,bj,Na,ak。4,,5,,。,6,500Hz,,。,300Hz,7,,。[1].[J].,1996(4):4-5[2],,,.———21[J].,1999,10(1):77-80[3]PCI6143UserManual.USA:NationalInstrumentCorporation,2004[4],.LabVIEW8.20[M].:,2007[:2009.11.24]567∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠∠5

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