外文翻译---降低测量噪声的五个技巧

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1、附录A外文资料翻译FiveTipstoReduceMeasurementNoiseEnsuringmeasurementaccuracyoftenmeansgoingbeyondreadingrawspecificationsinadatasheet.Understandinganapplicationinthecontextofitselectricalenvironmentisalsoimportantforsecuringsuccess,particularlyinanoisyorindustria

2、lsetting.Groundloops,highcommon-modevoltages,andelectromagneticradiationareallprevalentexamplesofnoisethatcanadverselyaffectasignal.Therearemanytechniquesforreducingnoiseinameasurementsystem,whichincludepropershielding,cabling,andtermination.Beyondtheseco

3、mmonbestpractices,however,thereismoreyoucandotoensurebetternoiseimmunity.Thefollowingfivetechniquesserveasguidelinesforachievingmoreaccuratemeasurementresults.A.RejectDCCommon-ModeVoltageMakinghighlyaccuratemeasurementsoftenstartswithdifferentialreadings.

4、Anidealdifferentialmeasurementdevicereadsonlythepotentialdifferencebetweenthepositiveandnegativeterminalsofitsinstrumentationamplifier(s).Practicaldevices,however,arelimitedintheirabilitytorejectcommon-modevoltages.Common-modevoltageisthevoltagecommontobo

5、ththepositiveandnegativeterminalsofaninstrumentationamplifier.InFigure1,5ViscommontoboththeAI+andAI-terminals,andtheidealdevicereadstheresulting5Vdifferencebetweenthetwoterminals.Figure1Anidealinstrumentationamplifiercompletelyrejectscommon-modevoltages.T

6、hemaximumworkingvoltageofadataacquisition(DAQ)devicereferstothesignal14voltageplusthecommon-modevoltageandspecifiesthelargestpotentialthatmayexistbetweenaninputandearthground.ThemaximumworkingvoltageformostDAQdevicesisthesameastheinputrangeoftheinstrument

7、ationamplifier.Forexample,low-costMSeriesDAQdevicessuchastheNI6220deviceshaveamaximumworkingvoltageof11V;noinputsignalcanexceed11Vwithoutcausingdamagetotheamplifier.IsolationcandramaticallyincreasethemaximumworkingvoltageofaDAQdevice.Inthecontextofameasur

8、ementsystem,“isolation”meansphysicallyandelectricallyseparatingtwopartsofacircuit.Anisolatorpassesdatafromonepartofthecircuittoanotherwithoutconductingelectricity.Becausecurrentcannotflowacrossthisisolationbarrier,y