Gigahertz-Optik BTS256-LED User manual

Gigahertz-OptikGmbH Postfach1445 82170 PuchheimGERMANY Tel: + 49 / 89 / 89 0159 -0 Fax: -50 E-mail: [e-mail]
Gigahertz-OptikInc. 5PerryWay NewburyportMA01950 –4009 USA Tel: [phone] Fax: [phone] E-mail: [e-mail]
www.gigahertz-optik.com
Operation Manual
BTS256-LED
Measurement Instrument for
LuminousFlux Φ, SpectralDistributionW/nm
and ColorDataofLEDs
Version 01.2009-01

DearCustomer,
Wewouldliketothankyou forpurchasing ourproductand forthe confidenceplaced inourorganisation.The de-
sign,construction and calibration ofthisdeviceembodyexpertiseobtained overmanyyearsinthe fieldof light
and radiation measurementtechnology.Thusyou ownahigh qualitymeasurementinstrumentwithan excellent
reputation.
Thismanualwillhelpyou tosafelyand correctlyoperatethe instrument.Ifyou requirefurthersupport, wewillof
coursebe happytoassist you.
Ourultimatesuccesswouldbe yourrecommendation of usand ourinstrumentstoothers.
Gigahertz-OptikGmbH
TableofContents:
Page 2Tableof Contents
Page 3-4GeneralInformation -Warranty-Safety
Page 5Product SpecificSafetyInformation
Page 6-8About LEDMeasurements
Page 9-10BTS256-LEDTesterDescription
Page 11 BTS256-LED-150, -300 and –500 TesterforLarge SizeLEDs
Page 12 -20 G.O.O.S. SoftwareforBTS256-LEDRemoteControl
Measurement DeviceSet-up (Page 12-13)
CWMeasurement(Page 14-16)
DataLoggerMeasurement (Page 17)
Substitution Correction (Page 18-19)
DataImport intoExcel (Page 20)
Page 21 -23 G.O.O.S. SoftwareforBTS256-LED-150, -300,-500
Page 24 Specifications
Page 25 CEConformity
Appendix1:G.O.O.S.Installation Instruction
Appendix2:BTS256-LEDTechnicalManual
Version 01.2009-01
Guidelines/ Manual
BTS256-LEDTester/ Page2

GeneralInformation
Theoperatorshouldcarefullyreadthefollowinginstructionstoensureproperandsafeuseof thisequipment.
Afterunpackingthedevice,check foranymechanicaldamage orloosepartsinside. Shouldtherebeanytransporta-
tiondamage,informthesupplierimmediatelyanddo notoperatethedevice.
Gigahertz-Optikreservestheright tomakechangesat anytimewithout priornotice.
Liability
Responsibilityfortheconsequencesofusingthehardware/softwareandfortheintendedorachievedresultsofitsuse
restswiththepurchaser.
Innoevent shall Gigahertz-Optikoritssuppliersbeliableforanylossof use,interruptionofbusiness,lostprofits, lost
data, orindirect,special,incidentalorconsequentialdamagesof anykindregardlessof theformof action, whetherin
contract,tort(including negligence),strict liability,orotherwise, evenifGigahertz-Optikoritssuppliershavebeen
advisedofthepossibilityofsuchdamages.
Purchaserunderstandsandagreesthat Gigahertz-Optikisnotresponsibleorliablefordamagetoequipment caused
bytheuseof itsproducts.Purchaserunderstandsthat itusesGigahertz-Optikproductsat itsownriskandagreesto
indemnify,defend, andholdharmless Gigahertz-Optikfromanyandallclaimsarisingfromtheuseof itsproducts.
Safety
PROTECTEQUIPMENTFROMHIGHHUMIDITYAND MOISTURETOPREVENTDAMAGEORPOSSIBILITYOF
FIREDUETO ELECTRICALPROBLEMS
Donot operatethedeviceincase:
• iftheinstrument looksdamagedinanyway
• iftheinstrumenthasanylooseparts
• iftheinstrumentdoesnotfunction
Considerwhethersafeoperationof thedeviceispossible:
• afterprolongedstorageunderunfavorableconditions(outdoorsorinmoistenvironments)
• afterexcessivetransportationstress (e. g.duetopoorpackaging)
• undersevereenvironmentalconditions(hightemperature,humidity, etc.)
• underdangerousconditions(explosivegas,vapor,dust,etc.)
Operation and Cleaning Instructions:
THEABILITYOFOPTICALAND LIGHTMEASURINGINSTRUMENTSTOOPERATEAND MEASUREACCU-
RATELYCAN BEINFLUENCEDBYHUMIDITY,DIRTAND OTHERCONTAMINANTS.
Humidity,dirtand othercontaminantsonopticalcomponentsand theinternalreflectivecoating oftheintegrating
spherewilleffectspecifications.
Opticalcomponentsshouldonlybecleanedbytheend userifexperiencedand knowledgeableinthehandling and
cleaningof opticalcomponents.Otherwisethemanufacturerorhissuppliershouldbecontactedforservice.
Thereflectivecoatingoftheintegratingsphereshouldonlybe cleanedbytheend userif experiencedand knowledge-
ableinthehandling andcleaning ofopticalcoatings.Otherwisethemanufacturerorhissuppliershouldbecontacted
forservice.
Ordinarynon-aggressiveplasticscleanersarerecommendedforcleaningcasesorhousings.Takeparticularcareto
ensurethatmoisturedoesnotentertheinstrumentordetectorhousingorintegratingspherewhencleaningthehous-
ing.
Donot useaggressivedetergentstoclean thedevice.
Version 01.2009-01
Guidelines/ Manual
BTS256-LEDTester/ Page3

GigahertzOptikGmbH
Postfach1445
D-86720PuchheimGermany
Tel.:++49(0)89 8901590
Fax: ++49(0)89 89015950
Email: [e-mail]
Gigahertz-OptikInc
5PerryWay
NewburyportMA01950USA
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Version 01.2009-01
Guidelines/ Manual
BTS256-LEDTester/ Page4
Homepage: http://www.gigahertz-optik.com
EnvironmentalConsiderations
Theinstrumentisdesignedtooperateatambienttemperaturesbetween+5 and+40ºC,andshouldbeprotected
fromdirectsunlightandmoisture.
Opticalmeasurementinstrumentsaresensitivetoextremesinenvironmentalconditionslikehightemperature,humid-
ityandcontamination.Measurementresultscan becorruptedundersuchextremeconditions.
Protectthedevicefromhighhumidity, hightemperature, direct sunlightandcontamination.
Donot usetheinstrumentimmediatelyafterhaving takenitfromacoldintoawarmenvironment. Undercertaincir-
cumstances, condensationcoulddevelop andmaycausecorruptionofthemeasurementresults.Allowthedeviceto
adjusttoroomtemperaturebeforeswitchingiton.
Donot usetheinstrumentinpowerfulmagnetic,electromagneticand electrostaticfields.Thesedisturbancesmay
corruptthemeasurementresults.
Battery
Ifthedeviceisoperatedwiththebuilt-inbatteryorrechargeablebatterymakesurethatthedeviceisstoredonlywith
fullychargedbattery.Afterthree monthsorlongerinstoragethebatteryshouldberechargedtoavoidareductionin
lifetime.
Incaseof re-chargeablebatterythebatterywillchargewhentheplug-inpowersupplyisconnectedtothedevice.It is
notnecessarytoswitchonthedevice.
Tochargethebattery,useonlytheplug-inpowersupplysupplied.Anyotherpowersupplycoulddestroythedevice/
batteryandcouldbedangerous(overheating thebattery).
Obeynationalenvironmental lawsinthedisposal ofthebattery/device.
Warranty
Gigahertz-Optikwarrantsthattheproductwillbefree fromdefectsinmaterialsand workmanshipforaperiodof one
(1)yearfromthedateofpurchase.Ifanysuchproduct provesdefectiveduringthiswarrantyperiod, Gigahertz-Optik
will repairthedefectiveproductwithoutchargeforpartsandlabor, orwillprovideareplacementinexchangeforthe
defectiveproduct. Batteriesareexcludedfromthiswarranty.
Inordertoobtainserviceunderthiswarranty, customermust notifyGigahertz-Optikofthedefect beforetheexpiration
ofthewarrantyperiodandmakesuitablearrangementsforthe performanceof service.Customershallberesponsible
forpackaging and shipping thedefectiveproducttothemanufacturer.Customershall beresponsibleforpayingall
shippingcharges,duties,taxes, and anyotherchargesforproductsreturnedtolocationsoutsideof Germany.
Thiswarrantyshallnotapplytoanydefect,failureordamagecausedbyimproperuseorimproperorinadequate
maintenanceandcare.

Guidelines/ Manual
BTS256-LEDTester/ Page5
Version 01.2009-01
HazardInformation:
UseageHazard:
TheBTS256-LEDisalightmeasurementinstrumentde-
signedformobileand laboratoryusewithcapabilityinmany
differentkindsofend-userapplications.During themeas-
urementtheuserneedstoalign thedeviceandread-out
measurementinformation onaPCdisplayrequiring the
user’sfullattention.Becauseofthistheinstrumentshould
notbeusedininsecureorhazardousareasand applica-
tions.Trainingofpersonnelusingtheinstrumentshouldin-
cludethiswarning.
LightHazard:
StateofthearthighpowerLEDsemit verybrightlight which
can causeeyedamage.Pleasecheck and followsafetyin-
structionsasprovidedbythemanufacturerofthelight
source.Healthhazardguidelinesareavailablefromradia-
tionprotectionagenciesandoccupationalhealthand safety
protectionoffices.
PerilsClause:
Gigahertz-OptikGmbH,asmanufactureroftheBTS256-
LEDmeasurementinstrument,hasinformed theownerand
operatorhereinaboutthepossiblehazardsand risks asso-
ciatedwiththeuseand operation ofthedevice.Theowner
and operatoroftheinstrumentconfirmsunderstanding the
associatedrisksandhazards.Further,readingtheopera-
tionmanualisapreconditionforthesuccessfulset-upand
useoftheinstrument.Theoperatorconfirmsthecareful
and properuseofthemeasurement set-up toavoidanyrisk
tohimself andothers.
Picture5.1:Stateofthearthigh intensityLED

Guidelines/ Manual
BTS256-LEDTester/ Page6
AboutLEDMeasurement
Version 01.2009-01
Picture6.1:
WhiteLEDAssembled toDUTPCBofGigahertz-Optik’s
LEDA2LEDMeasurementAdaptersimulating Application
ConditionsDuring Qualification Measurement
TheBTS256-LEDtesterisalightmeasurementdevicees-
peciallydesignedtoanalyzethelightoutputofprintedcir-
cuitboard(PCB)mountedand operatedLightEmitting Di-
odes(LED).
Basics ofLEDMeasurements:
LEDs aresemiconductorlight sourceswithahigh efficiency
electricalpowertolightpowerconversion.Aswithany
semiconductordevice,operating temperatureeffects
changesinperformancereferredtoasadevice’stempera-
turecoefficient. Inconnection withLEDsthetemperature
coefficientwilleffectareduction inlightoutputand adriftin
color.Operation underhigh junction temperatureconditions
mayeffectlifetime.Certainambientoperating environ-
ments,e.g.high humidity,canimpactlifetimeand device
specificationsaswell.Thermalmanagementisofprimary
importancetothesuccessfulimplementation of LEDs.
Sorting orgrading ofindividualLEDsbycolordifferences
caused bytolerancesinthe semiconductorprocessisa
common practiceoffered bymostsemiconductormanufac-
turers. But duetodiffering LEDmanufacturer’ssorting proc-
essesandoperating conditions,the LEDprocessing indus-
tryacceptstheneedforin-housemeasurements.These
measurementsshouldbe made withthe LEDdeviceinits
actualoperating stateintheapplication.
The mostcommon lightmeasurementquantity usedin
LEDtesting isluminousfluxmeasuredinlumen.Thisquan-
titycorrespondstoLEDefficiency bycorrelation ofthetotal
light outputtotheelectricalpower.Measurementofthe total
lightoutputinlminstead ofluminousintensityincdpro-
ducesmuchbetterreproducibilitybecauseitisindependent
ofspatiallightdistribution (picture6.2)whichmaybe influ-
encedbytemperature,humidity,distance,differentviewing
angles, misalignment and otherexperimentalerror.
Measurementofluminousfluxwitha goniometricpho-
tometer isthe mostprecisemethodofmeasurement. Here
asummation ofthe spatialluminousintensitydistribution
withinthehemisphereinfrontoftheLEDisperformed.
Howeverthisisatimeand costintensivemethodtypically
applied inhigh levelR&Dand Qualitylaboratories.
Inindustryalight meterwithan integratingsphere (picture
6.3)arethemostcommon measurementdevicesem-
ployed.Thisapproachofferseasyand fastoperation as
wellascosteffectiveness.Theintegrating sphereactsas
lightintegratorforspatiallyemitting lightsources.The inte-
gration effectistheresultofmultiplediffusereflectionsof
the lighton the diffusereflecting surfaceofthehollow
spherewhichresultsinauniformlightdistribution atthe
spheresurface.Theilluminancemeasuredatanyposition
on theintegrating spheresurfaceisthereforean indicatorof
the totalfluxgenerated byalight sourceinside oroutside of
the sphere. Aswithanyothermeasurement deviceintegrat-
ing spheresexhibitsome typicalcharacteristics which
must beconsidered inuse:
1.The substitutioneffect isone sourceofmeasurement
uncertainty.During calibration ofthespherephotometer
someofthe lightirradiated intothe spherewillexitthe
Picture6.3:Integrating SpherePhotometer
Picture6.4:Substitution Effect
Picture6.2:LightMeasurementQuantities
LuminousFlux LuminousIntensity
[ lm]
I[ cd]
Light Detector
Baffle
Calibration: DarkRoom
withoutRe-reflected Light Measurement: DUTReflec-
ted Light backintoSphere

Guidelines/ Manual
BTS256-LEDTester/ Page7
AboutLEDMeasurement(Continued)
Version 01.2009-01
Picture7.1:AuxiliaryLampUse
spherethrough themeasurementportandbeabsorbed
inthedarkroom.Butduring actualuse,the measure-
mentportoftheintegrating spherewillbe fullyorpar-
tiallycovered bythedeviceundertestDUT.Solight
leaving the spherethrough the measurementportwill
be reflected backintothesphereadding erroneouslyto
the DUTlightsignal.Depending on the spectralreflec-
tivityandcoloroftheDUTthere-reflectedlightwillvary
inintensityandcolorandeffectanunknownmeasure-
menterror.Auxiliarylampsareusedtocompensatethis
substitution errorbymeasuring thesignaloftheauxil-
iarylampwithand without theDUTat themeasurement
portof theintegrating sphere.Thedifferenceinintensity
isusedasacorrection factorforfollowing measure-
mentsofthe samekind of DUT.
2.The sizeoftheintegratingsphere shouldbe much
largerthanthesizeofthetestsampletokeepmeasure-
mentuncertaintylowindependentofthe spatiallight
emission characteristicofthetestsample.Thesmaller
the spherethegreatertheinterferenceofthe uniform
lightdistribution duetointernalbaffles,portsandauxil-
iarylamp.Smallsizeintegrating spheresensorsused in
mobilelightmetersmustthereforebecalibrated bya
calibration lampwithspatialemission characteristic
closetothatofthedeviceundertest. Lightmeterswith
smallsizeintegrating spheresdesigned forwide angle
emitting LEDsmayhaveincreased measurementuncer-
taintywhenusedtomeasurenarrowbeamemittertype
LEDs.Inapplicationsinvolving large emitting area LED
sourcesandLEDarraystheonlychoiceislarge diame-
terintegrating spheres.
Besideslightintensity, spectralintensitydistribution and
colordata areimportant test propertiesinLEDtesting. The
spectrometeristhemostcommonlyused measurementde-
viceforthesetypesofmeasurements.Howeverthephoto-
diode arrayspectrometeremploying lowcostCCD sensors
islimited bysensorintensitylinearityand straylightcharac-
teristics.Analternativemethodistomateaphotodiode with
adiode arraysensor,e.g.Gigahertz-Optik’s BiTechSen-
sorsBTS (picture7.3).It’sphotodiode withphotometric
sensitivityprovidesapreciselinearratiobetweenlightinput
and signaloutputoveraverywide dynamicrange forvery
accurateluminousfluxmeasurements.Spectraldistribution
including thewavelengthofpeakintensityisprovided byit’s
diode arraysensor.The spectraldataenablesthemeasure-
ment devicetocalculatecolordata(xy and u’v’colorcoordi-
nates,colortemperature,colorrendering indexanddomi-
nantwavelength).Aspectralresolution of5nmisrecom-
mended forthe colorcalculation.
The sensitivityofphotodiode sensorbasedlightmeters
can becontrolled overdifferentgainrangesdueto
switchablefeedbackresistorsintheamplifiercircuit. The
responsetimeisshortandindependentofthe gainovera
wide range.
The sensitivityofphotodiodearray iscontrolled byinte-
gration timesothe lowerthe lightlevelthe longerthemeas-
urementtime.Butlongerintegration timeseffectincreases
Picture7.3:BITECSensorBaseSet-upDesign
Measurementwithout DUT MeasurementwithDUT
AuxiliaryLamp
Light Detector
Picture7.2:Calibration StrategywithHemispherical
Calibration LampforDiffuseEmitting LEDs
DiodeArray
CommonIncidentLight
PolychromaticorMonochromatic
Photometric
Filter
Grating
Photodiode
BeamSplitter
DarkRoom

Guidelines/ Manual
BTS256-LEDTester/ Page8
AboutLEDMeasurement(Continued)
Version 01.2009-01
Picture8.1:PulseWidthModulated Signal
inbothsignaland darksignal.Toimprovethesignalto
noiseratiooffsetcompensation becomesanimportantrule
fordiode arraysensors.Bestoffsetcompensation isdone
withadarksignalmeasurementusing the sameintegration
timeasthe signalmeasurement.Aremotecontrolled shut-
tersupportssynchronized integration timeon-line offset
compensation.Lowlightdetection withCCDphotodiode
arraytechnologycanbeachieved byemploying offsetcom-
pensation incombination withverylong integration times.
Due to thermaldrift LEDsareoftenoperatedinpulse
widthcontrolled mode (picture8.1).Thereducedaverage
powerunderthismodeproducesahigherpeakintensityin
lightoutput. Foraccuratefluxmeasurementsatlowerfre-
quency thelightmetershouldbe synchronized totheop-
eration frequencyofthe LED.The synchronization tothe
lightoutputoftheLEDcan be done withphotodiodesbe-
causeoftheirfastresponsetime.
Time
Intensity
PeakIntensity
Average Intensity
Frequency Synchronized
Measurement Sequences

Guidelines/ Manual
BTS256-LEDTester/ Page9
BTS256-LEDTesterDescription
Version 01.2009-01
Picture9.1:BTS256-LEDBaseDesign
TheBTS256-LEDtesterisacompactsizemeasurement
instrumenttomeasureLEDsassembledand operatedon
printedcircuitboards(on-boardLEDs).Thedesign goal
wastocreatealightmeterthatcouldbebroughttotheap-
plicationinstead ofhavingtobringtheDUTtothemeter.
Theend usercan thereforemeasurehisLEDunderreal
application conditionsanywhere.
Design (picture9.1)and operatingdescription:
TheBTS256-LEDdeviceisdesignedwithacompactsize
integratingsphere.Theintegratingspherecoating isGiga-
hertz-Optik’srobustODM98typeOP.DI.MA.withanearly
perfectdiffusereflectioncharacteristic.Toreduceriskof
contaminationthesphereinputissealedwitha3Dformed
window.Thelightinputisaconicaltypeadapterwhichcan
besetovertheDUTLED. Tomeasurethetotalfluxemitted
bytheLEDthesurfaceoftheLEDmustbewithintheconi-
caladapter(picture9.2).
TocompensatesubstitutionerrorswhiteLEDsactasauxil-
iarylamps.TheLEDsareremotecontrolled tosupportthe
substitutioncorrectionfunction includedintheG.O.O.S.
softwaresuppliedwiththeinstrument.
Gigahertz-Optik’ssmall footprintBTS256-Plightsensorof-
fersafinephotometricmatchingphotodiodeforaccurate
widedynamicrangefluxdetection.Toworkinconcertwith
theintegraldetectoracompactlowstraylightdesignspec-
trometerisincluded.It’s256 pixelCMOSsensorenables
spectraldistributionmeasurementswitha5nmbandwidth
asrecommendedforcolormeasurements.Anultracom-
pactremotecontrolledshutterisprovidedforon-lineoffset
compensationofthediodearraythroughdarksignalmeas-
urement.Forbestsignaltonoiseratiotheoffsetcompensa-
tionisdoneinan on-linemodeforeachmeasurementwith
identicalintegrationtimeasthatofthemeasurement
(picture9.3).Inapplicationswherethefluxlevelremains
thesameoveraconstantintegrationtimeaoffsetconstant
can beused.Thisreducesthemeasurement timesincethe
on-linedarksignalmeasurementisomitted.
Thespectralmeasurementdataisdisplayedandusedfor
documentationofthespectralfluxdistributioninW/nmas
well asfluxpeakintensitywavelength,dominantwave-
length,xyand u’v’colorcoordinates,colortemperatureand
colorrendering index.
Thespectraldataisalsousedforon-linecorrectionofthe
spectralmismatcherrorofthephotometricdetector.This
spectralerroriscausedbylimitationsincurrentfiltercorrec-
tiontechnology.Byknowingthespectralsensitivityofthe
photometricdetector,theemissionspectrumofthecalibra-
tionlampused forcalibrationandtheemissionspectrumof
thetestsample(DUT)acorrectionfactorcanbecalculated
usingGigahertz-Optik’sa(Z)method.Besidetheon-linea
(Z)correction foreachmeasurementaconstanta(Z)factor
can beusedforfastfluxmeasurementwiththeintegralde-
tectoronly.
Togetmorestablemeasurementsinapplicationswith
pulsemodulatedlightorlightwithACcomponentsthe
Picture9.2: Measurement Position
Picture9.3:SpectralMeasurementMode
Picture9.4:PulseFrequencySynchronization
Time
Intensity
Frequency SynchronizedMeasurement Sequences
BTS-256P
LEDDrive
ShutterDrive
µP
RS232
SMDwithoutLens SMDwithLens
Time
Time
EqualIntegrationTimeOn-lineOffset Mode
FixedOffset ModeforEqualIntegrationTime

Guidelines/ Manual
BTS256-LEDTester/ Page10
BTS256-LEDTesterDescription (Continued)
Version 01.2009-01
Picture10.1: Measurement Port View
BTS256Psensorcan be synchronizedtothefrequency of
thelightsignal.Thefastintegralsensor(photodiode)is
usedtodetecttheACcomponent forbothsensors(integral
and diodearray).Themeasurementtime(integrationtime)
isthan settointegermultiplesoftheinputsignalACcom-
ponent timeperiod.
TheBTS256-LEDtestermicroprocessorsupportsremote
controlledoperationviaRS232interface. Tosimplifyuseit’s
processorsupportsthecompleteset-up,measurementand
calculationroutinetominimizethePCsoftwaretoagraphi-
caluserinterfaceGUI level.
TheBTS256-LEDtesterisfullyremotecontrolledviait’s
RS232 interface.AUSBtoRS232adapterissupplied to
allowconnectiontothemorecommonlysuppliedUSB inter-
facesintoday’slaptopsandPCs.TheUSB adapteralso
suppliestherequired5Voperating voltage.
NOTE:
The BTS256-LEDRS232interfaceandtheUSB toRS232
adapterarecustommodified tosupplypowertotheLED
tester.BothdevicesshouldonlybeusedwiththeBTS256-
LEDandnot onanyotherconventionalinterfacedevice.
TooperatetheBTS256-LEDitneedstobeconnectedtoa
laptop orPCwithUSB interfacebyusingtheUSB-RS232
adapter(picture10.2)supplied.Theadapteralsosupplies
the5VDC operating voltagefromthecomputerpowersup-
plytotheBTS256-LED.Thedriversoftwarefortheadapter
isavailableontheG.O.O.S.softwareCD andinstalleddur-
ingtheG.O.O.S.installationroutine.
TheBTS256-LEDtesteriscalibrated byGigahertz-Optik’s
calibrationlaboratoryforlightmeasurementquantities
againstcalibration standardstraceabletonationalandinter-
nationalmetrologylaboratories.Thecalibration procedure
and calibration valueswiththeircalibrationuncertaintyare
confirmed intheindividualset-upcalibrationcertificatesfor
eachdevice.Re-calibrationisrecommendedevery12
months.
Picture10.2:USB-RS232-5VDC Adapter
Picture10.3:Hard-case
Picture10.4: Cone Adapter

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BTS256-LEDTester/ Page11
BTS256-LED-150, -300 and –500 forLargeSizeLEDs
Version 01.2009-01
Picture11.1:BTS256-LED-500withUMBB-500Sphere
LargesizeLEDsorLEDarraysrequirelargersizeintegrat-
ingspheresthan theonebuiltintotheBTS256-LEDtester.
FortheseapplicationstheBTS256-LEDtestercanbeor-
deredwithlargerdiameterintegrating spheresfrom150mm
(6in)withportdiameter ≥25mm(1in),300mm (12in)with
portdiameter ≥50mm (2in)and500mm (20in)with ≥
75mm (3in)diameter.Theadd-onsphereandBTS256-
LEDtesterarecalibratedtogetherandthereforeformone
inseparableunit.
TheBTS256-LEDtestermountstotheintegratingsphere
withaUMPA-1.5-BTS256LEDadapteronUMPF-1.5-HL
portframeoutofGigahertz-Optik’suniquemodularUMin-
tegratingspherefamily.
Gigahertz-Optik’sUM*) seriesintegratingspheresand ac-
cessories(spherecomponents)offeroneofthemostexten-
siveintegrating spheresystemprogramsavailable.
Worldwideacceptanceisduetoitsmodulardesignconcept
thatallowstheend-usertoset-upthesphereaccordingto
hisownapplication specificationsandbudgetrequirements.
Eachintegratingsphereisbuilttoorderfromalargestock
ofstandardcomponentsusing an efficientcosteffective
production process.Custommodificationsofstandardcom-
ponents,customdesigncomponentsandcompletesystem
set-upsareoffered.
*)the Ulbrichtsche Kugel(Integrating Sphere)isnamedfor
the designing engineerRichardUlbricht(1849to1923).M
standsfor Modularconcept
Foraccuratemeasurementsindependentof thesubstitution
effectcausedbytheDUTblockingthemeasurementport
theuseofanauxiliarylampisneeded.Theauxiliarylamp
employsahigh powerhalogenlamptomeettherequired
fluxlevels. If apowersupplywithinterfaceisavailable, e.g.
Gigahertz-Optik’sLPS-100,thesubstitution correction rou-
tinecan besupportedbytheG.O.O.S.software.
Picture11.2:UMPA-1.5-BTS256LEDBayonetAdapter
Picture11.3:FixbyturntheBTS256-LED
AuxiliaryLamp

Gigahertz-Optik’sobjectorientedsoftwareG.O.O.S.isthebasisforremotecontrolapplication ofmanyofGigahertz-Optik’s
products.Themainconcept ishardwareandfunctionalDLLswithagraphicaluserinterface(GUI).TheG.O.O.S.versionfor
theremoteoperation oftheBTS256-LEDsupportstheset-upoftheLEDtester, measurement routine, datadisplayand pres-
entationaswellasdocumentation.Thefollowingpagesdescribetheavailabletoolsandtheiruse.Theinstallationofthe
G.O.O.S.softwareand therequiredinterfacesupport softwareisdescribedinthemanualappendix.
Guidelines/ Manual
BTS256-LEDTester/ Page12
SoftwareforRemoteControlMeasurementsand Documentation
Version 01.2009-01
TheG.O.O.S.startscreendisplays the
controlandmeasurementfunctions
specifictosystemset-upassupplied.
Forexample,ifonlytheBTS256-LED
testerwasorderedonlythosefunctions
specifictothisinstrumentareavailable,
allothersareinactive.
ThePhi(Φ=LuminousFlux)button
openstheconfiguration window.Before
firstmeasurementtheavailableitems
mustbeconfiguredoratleastchecked.
Thesetupconfigurationisstored for
following measurementsevenifthe
G.O.O.S.isswitchedoff.
MeasurementDeviceincludesthe
BTS256-LEDtesterset-up.
TheBTS256-LEDoffersanintegraland
spectralmeasuringsensorthatneedto
beset-up intheconfigurationwindow.
1.Opentheintegralset-upwindow
2. a(Z)correction
Online - recommendedforregularuse
fix value-recommendedforfluxmeas-
urementswithintegraldetectoronly
whenshortintegrationtimeisneeded,
e.g.forfastdatalogging measurements
3.integrationtime
Theintegrationtimeoftheintegralde-
tectorread-outelectronicscan bese-
lected.
4. pulsesynchronization
Selectedincaseofmodulatedlight
sourcewithafixedfrequency
5/6.confirmation orcancelingof set-up
Openstheconfiguration windowfor
BTS256-LEDmeasurement device,
dataloggerandsubstitutioncorrec-
tionaswellasforaccessories, e.g.
lamppowersupplies
Selection oftheavailable
measurementroutines
CWandDataLogger.
Devicemodel andserial number
Selection of optional configuration
1
2
3
4
5 6
Pulsesynchronization activated

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SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
1. opensthespectralset-upwindow
2. on/off ofspectralmeasurement
3. wavelengthrange:
Set-up ofthemeasured anddisplayed
wavelengthrange(max365to765nm)
and spectralresolution(5nmrecom-
mendedforcolormeasurements)
4. gainranging‘auto’:
Automaticadjustmentofintegrating
time.Forunknownfluxlevelsauto
rangingisrecommended.Lowsignal
levelswill createlongermeasurement
times.
5. pulsesynchronization
Selectedincaseofmodulatedlight
sourceatfixedfrequency.
6/7.confirmation orcancelingof set-up
1. gainranging‘manual’:
Manualgainranging isrecommended
inapplicationswerethefluxlevelis
known.Afixeddiodearrayintegration
timeavoidsverylong measurement
timesthatcanreachup to120s(2x60s
incaseofon-lineoffset)forlowsignals.
If manualgainisselectedtheintegra-
tiontimerepresentingthediodearray
sensitivitymustbeset.Selectthesame
integration timeasthatdisplayeddur-
ingameasurementunderautorange
setting.Thearraysignallevelisalso
displayedon themeasurementscreen
toavoiderrorscausedbysaturationor
lowsignaltonoiseratio.
2. useconstant offset:
Inmanualmodemeasurementswitha
constantoffset valuecan beselectedto
reducemeasurementtime.
1.If useconstantoffset isactivatedthe
darksignalmustbemeasured.The
darksignalmeasurementisdoneac-
cording totheintegration timeset.Ifthe
integration timeischangedthedark
signalmustmeasuredagaintoreduce
measurement uncertainty!
3/4.confirmation orcancelingof set-up
1
2
3 4
6 7
5
1
2
1
3 4
Pulsesynchronization activated

Guidelines/ Manual
BTS256-LEDTester/ Page14
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
1.Whenthedeviceset-upisfinished
theconfigurationwindowshouldbe
closed.
2.OpentheCWmeasurement window
Measurement window:
1.startsthemeasurement
2.stopsthemeasurement
3.displaysthemeasurementtime
4.opensCRI displaywindow
5.fluxvalueinlm
6.xychromaticityvalues
7.colortemperatureinK
8.diodearraysignallevel.100%
indicatessaturation.
9.a(Z)correctionfactor
10.dominantwavelength
11. wavelengthofpeakintensity
12.peakintensity
Informationwindowdisplaysmeasure-
ment set-upconditions
Measurementwindowaftermeasure-
mentisstopped withactivatedCRI
window.
PleasenotethatCRImeasurements
requirea1nmspectralbandwidth
set-upforthediodearray:
1.selectsnumericaldisplay
2.selectsgraphicaldisplay
3.stopsthemeasurement
4.reset button
5.startdatastorage
6.cleardisplays
7.startsprotocolprintout
1
2
1
2
3
4
1 2
4
5
3
6
7
5 6 76
9
8
10 11 12

Guidelines/ Manual
BTS256-LEDTester/ Page15
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
2Dgraphicofspectralfluxdistribution
withactivatedcursorforwavelength
intensityindication
CIEchromaticitydiagramwithxycoor-
dinates
CIEchromaticitydiagramwithu’v’coor-
dinates

Guidelines/ Manual
BTS256-LEDTester/ Page16
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
Forquickdocumentationaprint-outcan
begenerated.Theheaderallowsuser
commentsorfilenametobeentered.
The2Dgraphshowingspectralflux
distributionisincludedintheprintout.
IftheCIExyorCIEu’v’areactivated
the2Dgraphwillbereplacedbythe
selectedone.
Inthepreviewwindowtheprint-out
layoutcanbecheckedbeforeprinting
thedocument.
Measurementdatacan alsobestored
inASCIfileformatusingthestandard
PCstorageroutines.
.int
includesallintegralmeasurement data
.sp3
includesscaledwavelengthandspec-
tralfluxdata
InstructionsforimportingtheASCII
dataintoExcelareprovidedattheend
ofthissoftwaredescriptionsection.

Guidelines/ Manual
BTS256-LEDTester/ Page17
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
Thedataloggermodeenablesmeas-
urementanddatastorageinauser
definedsequence. Set-up isdoneinthe
configurationwindowforthedatalog-
ger.
Dataloggermeasurementisinitiated
withthestartbutton.
Upon completion ofthemeasurement
sequencethedatacanbeprinted and/
orstoredinASCIIfile.
Print-outpreview

Guidelines/ Manual
BTS256-LEDTester/ Page18
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
Tocompensateforthesubstitutioner-
ror,correctionvaluesmustbegener-
ated.Thesecorrection valuesarevalid
foruseforallDUTdesignswithnearly
identicalcorrection factors.Theseval-
uesshouldbecheckedtoavoidstoring
toomanysubstitutioncorrectionfac-
tors.
Thesubstitutioncorrection menuopens
intheconfigurationscreen.
Afterthestartofthesubstitutioncorrec-
tionroutine(1)theoperatorisaskedto
ensurethattheBTS256-LEDtester
measurementportisorientedtowarda
blackbackground orsetontoablack
diffusereflectingsurface(2).Thesur-
facemustbeblacksincecoloredsur-
faceswill changethereferencemeas-
urement!Ifnotinadarkroomambient
lightbackground isalsonotacceptable
forthesamereason.
Afterthereferencemeasurementthe
operatorisasked(3)tosetthe
BTS256-LEDtesteronthetestsample
(DUT). TheDUTLEDmust beswitched
off!
Theevaluatedsubstitution correction
factorcanbestoredforfutureuse(4
and 5).
2 3
4
5
1

Guidelines/ Manual
BTS256-LEDTester/ Page19
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
6.Iftheevaluatedsubstitutioncorrec-
tion valueistobeused forfollowing
measurementsitneedstoactivated
7. Theevaluationstepsaredisplayed
8.Applicationofthesubstitution error
correctionmust beactivated
9.Storedsubstitutioncorrectionfactors
can beloadedforuse
7
6
8
9
9

Guidelines/ Manual
BTS256-LEDTester/ Page20
SoftwareforRemoteControlMeasurementsand Documentation (Continued)
Version 01.2009-01
DataimportintoExcel:
Excelversion2007isrecommended.
Olderversions,e.g.2003,havealim-
itednumberofcolumnswhichwould
notallowspectraldatatobeimported
withhigherthan 5nmspectralresolu-
tion.
In 081209 golden_dragon_white.int
theintegralmeasurementdatais
stored.UseExcelimportfunctionto
importthedataintoExcel.TheExcel
textconversionassistantwillappearto
handlethedataseparators.
ThesuppliedG.O.O.S.versionalso
supportsGigahertz-Optik’sX4light
analyzerwhichoffersmanymoreaddi-
tionalfunctionsthantheBTS256.LED
tester. BTS256-LEDdatashown:
az0
value0
unit
peaklambda
peakPower:
T
x
y
u’
v’
RaandR1toR14
Thediodearraydata(pixelsand
counts)arealsostored.
In 081207 BTS256-LEDtest.sp3 the
wavelengthdependentmeasurement
valuesarestored.