Medalisti5000SystemProtectionFeaturesWhitePaperOverviewTheAgilentMedalisti5000hasseveralfeaturesthatprotectthetestsystemaswellasthedevicesontheboardundertest.ThefeaturesdescribedhereenhancethereliabilityandthustheavailabilityoftheMedalisti5000testsystembyprotectingitfromdamagetotheelectricalcircuitsbyinvalidvoltagesontheboardundertest.Thesefeaturesinclude:•DriveCheck–verifiesthatthedigitaldrivercantransitiontoallprogrammedlogicstates.•Overvoltage/undervoltageprotection–protectsthesystemdriversandreceiversfromexcessivelyhighorlowvoltagesontheboardundertest.•On-boarddischarge–hardwareontheunmultiplexedhybrid144cardtodischargetrappedchargesontheboardundertestwhichpreventsdamagetothepincardrelays.•Currentlimit–preventstheDUTpowersuppliesfromsupplyingmorethanaspecifiedlevelofcurrent.Thisfeaturealsoprotectstheboardundertest.Thispaperexploresthesefeaturesindetail.Italsodiscusseswaystoovercomeproblemsontheboardundertestwhichmaycausetheseprotectionschemestobeactivated.DriveCheckDuringadigitaltest,theDriveCheckfeatureontheMedalisti5000systemsenseswhetheradriverreachesitsprogrammedlogiclevelduringvectorexecution.Ifthisconditionisnotmet,afatalerrormessagewilloccurduringtestexecution,haltingthetest.ThereportmessagewilllistaDriveCheckerrorcondition,thenodetheerroroccurredon,andthevectornumberwhenappropriate.DriveCheckguaranteesthatthedigitaldriverisoutputtingthecorrectstatetothedeviceundertestbyvalidatingthedriverstateduringthereceivestrobe.Inaddition,DriveCheckmayprovidecluesintounstabletestsifotherdevicesattachedtothesamenodeindictedarenotappropriatelydisabledwheretheiroutputscouldinfluencethedevicetest.ADriveCheckfailurecanbecausedbyinterferencewithotherdevicesontheboardundertest.Conditionsthatcancausethisfailureare:•AlowimpedancepathbetweentheAgilentMedalisti5000driverandahighcurrentsourceontheboard.Thissourcewouldhavetobedisabledinordertopreventthisruntimeerrorfromoccurring.•Anoscillatorontheboardthatisnotbeingdisabled.Thetransit