PicoQuant MultiHarp 150 - Page 71

PicoQuantGmbH MultiHarpSoftwareV.3.1.0.0
Trc./Block tracecolorindicator,editboxandspincontrol
TheMultiHarpsoftwarecanmeasureandstorehistogramsinupto512memoryblocks.Outofthese,upto16
curvescanbedisplayedandone"activeblock"canbeusedformeasurements.Choosetheactivememory
blockyouwishtouseforthenextmeasurementhere.Thetracemappingdialogisusedtoselectthecurvesfor
display.Makesurethecurveyouareusingisswitchedon(shown).Youcanopenthisdialogdirectlybyclicking
onthetracecolorindicator.Thecolorindicatorshowsthetracecolorthechosenblockiscurrentlymappedto.If
itisasolidsquare,thecurveismappedandshown.Ifitismappedbutnotshown,theindicatorshowsasmall
stripedsquare.Ifthecurveisnotevenmappedfordisplaytheindicatorremainswhite.Makesurenottoover-
writeexistingdatainablockthatwasusedbefore.Inordertowarnyouthatatraceisused,theheadingofthe
Trc/Blockselectorwillturnred.
Restart checkbox
Ifthisboxisticked(checked)themeasurementwillautomaticallyrestartaftertheacquisitiontimehaselapsed.
Togglethecurrentsettingwithamouseclick.ThesettingiswithouteffectinTRESmode.
Stop on Overflow checkbox
Ifthisboxisticked(checked)themeasurementwillstoponoverflowofanyhistogrambin.Theoverflowlimitis
setbythe"Stop At"parameter.Togglethecurrentsettingwithamouseclick.
Mode selectionbox
Hereyoucanselectbetweenthreedifferentacquisitionmodes:
Oscilloscope Mode:
Inoscilloscopemodetheacquisitionanddisplay,oncestarted,repeatsatintervalsgivenbythecurrentac-
quisitiontimesetting.Thehistogramaccumulationalwaysstartsfromscratch.Thisisusefulformonitoring
fastchangesduringopticalalignmentetc.Notethatinthismodeyoumayseenothingforalongtimeifyou
settheacquisitiontimetoahighvalue.Typicallyonewouldnotsetanacquisitiontimeofmorethan1sec-
ondinthismode.
Integration Mode:
Asopposedtooscilloscopemode,thehistogramacquisitioninintegrationmodeisnotresettozerowith
eachdisplayrefresh.Thehistogramcontinuestogrowwhilethedisplayisupdatedevery0.1to1seconds.
TheupdaterateisdeterminedbytherefreshratevalueselectedintheGeneral Settings Dialog.Acquisition
canbemanuallystartedandstopped,additionallytheoption"Stop on Overflow"willstoptheacquisition
whenthemaximumcountofanyhistogrambinoverflows.Theoption"Restart"willcausetheacquisitionto
startagainaftertheacquisitiontimehaselapsed.Thisissimilartooscilloscopemodebutallowswatching
thehistogramgrowiftheacquisitiontimeisfairlylong.
TRES Mode:
Selects  the measurement  mode  TRES  (Time–Resolved Excitation/Emission Spectra).  This  requires  a
monochromatorandcorrespondingdriverhardware/softwaretobeinstalled.Seesection5.4.
Stop At editboxandspincontrol
Here thestopcountlevelforhistogrammingcanbe set.Thesetting isonlymeaningfulifthecheckbox
"Stop Ofl"isactive.Typethevalueasanintegerintheeditboxandpress<Enter>orclickonApply.Alterna-
tively,usethespincontrol(nexttoit)toincrement/decrementthecurrentvalue.Inthiscasechangestakeef-
fectimmediatelywithoutpressing<Enter>.Theminimumis0.Iftheenteredvalueexceedstheallowedmaxi-
mumof4,294,967,295,anerrormessageappears.Whenusingthespincontrol,exceedingthemaximumisnot
possible.Insteadofincrementingthevaluefurther,thesystembeepsasawarning.
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