基于usb高速数据采集外文翻译

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1、DataAcquisitionSystemsDataacquisitionsystemsareusedtoacquireprocessoperatingdataandstoreiton，secondarystoragedevicesforlateranalysis.Manyorthedataacquisitionsystemsacquirethisdataatveryhighspeedsandverylittlecomputertimeislefttocarryoutanynecessary,ordesirable,

2、datamanipulationsorreduction.Allthedataarestoredonsecondarystoragedevicesandmanipulatedsubsequentlytoderivethevariablesofin-terest.Itisveryoftennecessarytodesignspecialpurposedataacquisitionsystemsandinterfacestoacquirethehighspeedprocessdata.Thisspecialpurpose

3、designcanbeanexpensiveproposition.Powerfulmini-andmainframecomputersareusedtocombinethedataacquisitionwithotherfunctionssuchascomparisonsbetweentheactualoutputandthedesirableoutputvalues,andtothendecideonthecontrolactionwhichmustbetakentoensurethattheoutputvari

4、ablesliewithinpresetlimits.Thecomputingpowerrequiredwilldependuponthetypeofprocesscontrolsystemimplemented.Softwarerequirementsforcarryingoutproportional,ratioorthreetermcontrolofprocessvariablesarerelativelytrivial,andmicrocomputerscanbeusedtoimplementsuchproc

5、esscontrolsystems.Itwouldnotbepossibletousemanyofthecurrentlyavailablemicrocomputersfortheimplementationofhighspeedadaptivecontrolsystemswhichrequiretheuseofsuitableprocessmodelsandconsiderableonlinemanipulationofdata.Microcomputerbaseddataloggersareusedtocarry

6、outintermediatefunctionssuchasdataacquisitionatcomparativelylowspeeds,simplemathematicalmanipulationsofrawdataandsomeformsofdatareduction.Thefirstgenerationofdataloggers,withoutanyprogrammablecomputingfacilities,wasusedsimplyforslowspeeddataacquisitionfromuptoo

7、nehundredchannels.Alltheacquireddatacouldbepunchedoutonpapertapeorprintedforsubsequentanalysis.Suchhardwireddataloggersarebeingreplacedbythenewgenerationofdataloggerswhichincorporatemicrocomputersandcanbeprogrammedbytheuser.Theyofferanextremelygoodmethodofcolle

8、ctingtheprocessdata,usingstandardizedinterfaces,andsubsequentlyperformingthenecessarymanipulationstoprovidetheinformationofinteresttotheprocessoperator.Thedataacquiredcanbea