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1、AbstractAbstractNowadays,thecomputernetworkhasbeenappliedinvariousindustries.Butsometimesdatatransfermessuporeventhecommunicationisblocked,whichmaycausehugeeconomiclose,becauseofunreasonabledesign,incorrectimplementation,naturalfactorsandsoon.Soitisimportantfornetmai
2、ntenanceworkerstofindoutwherethenetcableproblemisandthinkouthowtosolveitassoonaspossible.Thetwisted-pairtestmoduleisessenceoftheprojet“PortableNetworkTroubleTestingInstrument”carryingoutfollowingfunctions,brokenpointlocatedandwiremaptest,butitstillhassomedefects.Base
3、donexistentdesign,thisarticlefocusesondevelopingthesystemicstabilitythroughperfectingtestfunctionanddesignapowermodulewithsmallvolume、lowpowerconsumption.Theauthor’smainworkshadlistedbelow:1.Contraposedtotheshortagesofunstabletestresultsandinadequatetestchannelsinbro
4、kenpointtest,improvedthecircuitofmeasurepulsewideandincreasedthetestchannelsfromonetofour.2.Duetothewiremaptestcircuitcouldnotdetectshortconnectpairandtheresultinfluencedbythenoisesomuch,Researchedthemethodofwiremaptest,designnewcircuittodetectshortconnectpair,thatma
5、kethewiremaptestinextenso;eliminatetheaffectofnoisestothetestresults,thatmakethetestresultsmorereliable.3.InviewoftheemissionlevelofdisturbancesourceexceededthesetlevelintheEMCtest,accordingtothetestreport,theauthordidasimpletestinstrumentationtoanalyzedthereasonthat
6、bringonthedisturbance,improvedtheplacementandroute
ofPCBandslovedtheEMCproblem.4.Acquiremoretrustworthydatatransferbyimprovingthedesignofserial
communicationprogram,FLASHburnprogramandDSPbootloaderandadding
checkout.5.Designedamulitoutputpowermoduleaccordingtothesyst
7、em’srequestforvoltageandcurrent,atthesametime,realizedbatterychargemanagecircuiteandIIAbstracton-offcontrolcircuite.Keywords:cablefaulttest,timedomainreflectometry,twistedpair,dc/dcIII目录目录第一章引言..........................................................................
8、................................11.1线缆测试的重要性...................................................................................11.2
