PicoQuant MultiHarp 150 - White Rabbit Dialog; Description of Controls

PicoQuantGmbH MultiHarpSoftwareV.3.1.0.0
Warnings Group
Hereyoucanselectivelyenable/disableindividualwarnings.Activatethecheckboxforeachwarningyouwish
toreceive.Seesection8.1fordetails.
Input Hysteresis Group
StartingwithMultiHarpsoftwareversion3.0andtheMultiHarp160itispossibletosetahysteresisoftheinput
comparatorslargerthanthedefaultvalue.Thissettingcanbemadehere.Itappliestoallinputssimultaneously,
includingthesyncinput.Thereareonlytwochoices:thedefaultvalueofabout3mVandthelargehysteresis
valueofabout35mV.Thelargerhysteresismayinsomecaseshelptosuppressnoiseartefactsontheinput
signals.Considerthisonlyalastrescuewhenitisimpossibletoeliminatethenoiseatitsorigin.
Notethatthissettingchangesuponloadinganexistingmeasurementfileaccordingtowhatwassetinthisfile.
Notealsothattheradiobuttonsforthehysteresissettingwillbedisabled(grayedout)whenthepresenthard-
waredoesnothavetheprogrammablehysteresisfeature.TheMultiHarp150modelsoutinthefieldatthetime
ofthissoftwarereleasedonotyethavethisfeature.However,itisplannedtomakeitavailablebywayofa
firmwareupdate.PleasecontactPicoQuantifyouneedit.
TTTR Marker Settings Group
HereyoucansetthesignalspecificationsforexternalmarkersignalsusedinTTTRmode(T2andT3mode).
Thesettingsforthedifferentmarkersareindependentfromeachother.Thefollowingtableappliestoeachof
thefourmarkers:
enable CheckthisifyouwantthemarkertobeincludedintotheTTTRdatastream.
rising / falling Radiobuttonstoidentifytheactiveedgeofthesignal.
Reference Clock Source Group
HereyoucanselecttheMultiHarp‘sclocksource.Normallyitrunsonitsowninternalcrystalclock.Incases
whereclocksynchronizationwithotherdevicesisrequireditispossibletouseanexternalsource,e.g.,another
MultiHarp,aGPS/GLONASSreceiver,oranatomicclock.Thelatterareofinterestwhenamoreaccurateclock
isrequired.Ineachcasetheclocksourcemustdeliveranindustrystandard10MHzclocksignal.Whenremote
synchronizationisrequiredthebestoptionisWhiteRabbit.InthiscasetheWhiteRabbitlinkmusthavebeen
establishedbeforeswitchingtoWhiteRabbitasaclocksource.Notethatanychangeoftheclocksourcere-
quiresre-initializationoftheMultiHarp.Alsonotethatanydisconnectionfromorinterruptionoftheexternalclock
willcausetheMultiHarptofailandreportasystemerror.Torecoverfromthiserrorstatethedevicemustbere-
initializedaftertheclocksourceisstableagain.
6.8. White Rabbit Dialog
Thisdialogallowsconfigurationandcontrolofthe MultiHarp‘sbuilt-inWhiteRabbitPTPCore(WRPC).This
corerunsautonomouslyintheMultiHarp‘sFPGAandisnotnormallyrequiredtousetheMultiHarp’sregularTC-
SPCandtimetaggingfunctionality.However,onceaWhiteRabbitconnectionhasbeenestablisheditispossi-
bletoswitchtheMultiHarp’sclocksourceovertoWhiteRabbit.Timetaggingcanthenbeperformedsynchro-
noustotheWhiteRabbitclockandremotedevice(s)synchronizedtothesametimingreference.
ForgeneralinformationonWhiteRabbitpleaserefertothewebsite
https://www.ohwr.org/projects/white-rabbit.
ForinformationontheWhiteRabbitPTPCorepleaserefertothepage
https://www.ohwr.org/projects/wrpc-sw/wiki s/home .
Fordetailsonthespecificversion4.0ofthecorecurrentlyusedintheMultiHarppleasereferto
https://www.ohwr.org/projects/wr-cores/wiki/wrpc-release-v40.
6.8.1. Description of Controls
TheWhiteRabbitDialogprovidesthreegroupsofcontrolsthataredescribedinthefollowingsubsections.
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