Extech Instruments LT45 Manuel utilisateur

USERGUIDE

LEDLightMeter

ModelLT45

LT45-en-EU_V1.5 9/14

Introduction

CongratulationsonyourpurchaseoftheExtechLT45LEDLightMeterthatmeasureslightfromLED

lampsinadditiontofluorescent,metalhalide,high‐pressuresodiumandincandescentsources.

TheLT45iscapableofmeasuringtheilluminationofwhite,red,yellow,green,blue,andpurple

LEDsupto400,000Lux(40,000Fc).

TheLT45canalsocalculateluminousintensity(CD)usingadistance‐to‐the‐lightvalueprogrammed

bytheuserinmetersorfeetunits.

TheLT45canstoreupto99readingsforlaterrecallandincludesOverloadindication,Battery

statusicon,Datahold,Maximum/Average/Minimum(MAX/MIN)tracking,push‐buttonZero

calibrationadjustment,AutoPoweroff(withdisablefunction),andautorangingfeatures.

Thisinstrumentisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsof

reliableservice.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthis

UserGuide,ProductUpdates,andCustomerSupport.

Features

OverloadIndication:LCDscreenwillshow“OL”attheupperleft‐handcorner

Batterystrengthstatusindication

DisplayUpdateRate:2.5timespersecond

SpectralresponsenearCIEluminousspectralefficiencyratings

CosineAnglecorrected

ConformstoJISC1609:1993andCNS5119generalclassASpecifications

Measurestheintensityofilluminationofwhite,red,yellow,green,blue,andpurpleLED

lightandallvisiblelightinLuxorfoot‐candles

CalculatesLuminousIntensity(CD)

Dataholdfreezesdisplayedreading

Maximum/Average/MinimumMemoryHold

Zeroadjustment

Autopoweroffwithdisablefunction

Automaticrangeadjustoptimizesaccuracyandresolution

Manuallystore/recallupto99readings

Completewithlightsensor,protectivesensorcover,andcoiledcableexpandableto59”

(1.5m),9Vbattery,andhardshellcase

LT45-en-EU_V1.5 9/14

Safety

Donotoperatethemeterinenvironmentswherethefollowingarepresent:explosivegases

(ormaterials),combustiblegases(ormaterials),steam,ordust.

Pleasereplacethebatteryimmediatelywhenthebatterysymbol appearsontheLCD.

Donottouchthemeter’scircuitboardforanyreasonasstaticelectricityorcontamination

coulddamagethesensitivecomponents.

ForIndooruseonly.Thisinstrumentwasdesignedforpollutiondegree2.

OperationAltitude:Upto2000m(7000’).

MeterDescription

1. Display(LCD)

2. Lux/Fc/CDunitselectbutton

3. MEM/READbutton(for99readingmemory)

4. UparrowbuttonandMAX/MIN/AVGbutton

5. PowerandAutoPowerOFFcontrolbutton

6. ZeroCalibrationbutton

7. DataHoldandLightsourceselectbutton

8. Downarrowbutton

9. Coiledsensorconnectioncable

10. Photodetector

Note:Thebatteryandtripodmountarelocated

onthebackofthemeter

LT45-en-EU_V1.5 9/14

Operation

PowerON‐OFF 

MomentarilypressthePowerbuttontopowerthemeter.TopowerthemeterOFF,

momentarilypressthePowerbuttonagain.

TakingMeasurements

1. SwitchthemeterON

2. Removethesensor’sprotectivecovertoexposethelightsensordome.Thedisplayshould

switchON,ifnotcheckthatfreshbatteriesareinstalled.

3. Themetermeasurestheintensityofthelight(illuminance)thatstrikesthesensordomein

footcandlesandluxunits(1fc=10.76lux)displayingthemeasuredvalueontheLCD.

4. UsetheLUX/FC/CDbuttontoselectLuxorFootcandleunits(CD,luminousintensity,is

explainedinthededicatedsection‘LuminousIntensity’).When‘OL’isdisplayed,the

measurementexceedsthemeter’srangecapability.

5. Positionthemeterandlightsourcesothatthelightstrikesthesensordomeperpendicularly.

Althoughthemetercompensatesforanincidenceangle,optimumperformanceisachieved

withasmallerincidenceangle.

6. Themeter’sLCDcanshowavalueupto3999onthelargedigitsandwhenmoredigitsare

neededtorepresentthereadingtwoadditional(smaller)digitsappeartotherightofthe

largerdigits,e.g.399900.

LUX/FC/CDUnits

MomentarypressesoftheLUX/FC/CDbuttontogglesLuxandFC(foot‐candles)units.Pressand

holdthebuttontoentertheCD(luminousintensity)mode.Referto‘LuminousIntensity’section

forfurtherinformation.

AutoPowerOFF

Tosavebatterylifethemeterpowersdownautomaticallyafterapproximately5minutesof

inactivity(nobuttonpresses).

Enable/DisableAutoPowerOff

WiththemeterON,pressandholdthePowerbuttonuntiltheAPOclocksymbolswitches

OFF(theAutoPowerOFFutilityisnowdisabledandtheusermustmanuallyswitchthemeter

off).Tore‐enabletheAutoPowerOFFutility,repeatthisprocess.TheClocksymbolwillswitch

ONwhentheAutoPowerOFFutilityisre‐enabled.

ZeroCalibration

1. Ensurethattheprotectivecoverisattachedtothelightsensor.

2. PowerthemeterandtheLCDshoulddisplay‘0’.

3. Momenarilypressthe“ZERO”buttonandtheADJ(adjusting)iconwillswitchONindicating

thatthezeroadjustment(calibration)isworking.Whenthecalibrationisfinished,theADJ

iconwillswitchOFFandthemeterwillreturntothenormaloperatingmode.

4. IftheprotectivecapisnotcoveringthesensorwhentheZEROcalibrationisstartedtheLCD

displaywillread“CAP”.Inthiscase,pleasecoverthesensorwiththecapandrestartthis

procedure.

LT45-en-EU_V1.5 9/14

MAX/AVG/MINMemoryMode

Themetercanrecordthemaximum,minimum,andaveragereadingsasdescribedbelow:

1. MomentarilypresstheMAX/AVG/MINbuttonandthemeterwillbegintotrackthe

maximum/average/minimummeasurements;the“MIN”iconwilldisplayontheLCD

indicatingthatthemeterisnowdisplayingtheminimumreading.Thereadingwillnot

changeuntilalowerreadingisregistered.

2. Pressthebuttonagaintoswitchfrom“MIN”to“MAX”wherethemeterwillshowthe

maximummeasurementvalue.The“MAX”iconwillbedisplayedontheLCD.

3. Pressthebuttonagaintochangethemodefrom“MAX”to“AVG”,wherethemeterwill

showtheaverageofthereadingstakensincethebuttonwasfirstpressed.The“AVG”

iconwillbedisplayed.

4. Pressthe buttonagaintoswitchfrom“AVG”backto“MIN”.

Toexitthismode,pressandholdthebuttonforatleast2seconds.TheMAX/AVG/MINicons

shouldallbeswitchedOFFwhentheunitreturnstothenormaloperatingmode.

MemoryRecord/ReadMode

1. MomentarilypresstheMem/Readbuttontostoreareading.TheLCDwilldisplayasmall‘M’

icononthelowerleft‐handareaoftheLCDalongwiththememorylocationnumber(1to

99)representingthestoragelocationfortherecordedreading.Upto99readingscanbe

stored.

2. Toreview(read)thestoredreadings,pressandholdtheMem/Readbuttonuntilthe‘MEM’

iconappearsatthetopoftheLCD.Nowusethearrowbuttonstoscrollthroughthestored

readings.Thesmall‘M’iconandthememorylocationcounter(1to99)willbeshownonthe

lowerleft‐handcorneroftheLCDwhilethemaindisplaydigitsshowthestoredreadingfor

theselectedmemorylocation.

3. Tostoreanaverage(AVG)reading,firstaccesstheAVGmode(SeeMIN/MAX/AVGsectionof

thisguide)andwhileanaveragereadingisdisplaying(AVGiconswitchedON),momentarily

presstheMem/Readbuttonforonesecond.TheLCDwilldisplay‘AVGM’andthememory

locationnumber(1to99)indicatingthatanaveragereadinghasbeenstoredinthe

numberedmemorylocation.

4. WhenastoredreadingisanAVGvalue,thescreenwilldisplay‘AVG’onthelowerleft‐hand

corner.

5. MomentarilypresstheMem/ReadbuttontoexittheMemorymodeandreturntothe

normaloperatingmode.

6. Toclearall99memorylocations:WiththemeterswitchedOFF,pressandholdthe

Mem/ReadandOn/Offbuttonssimultaneouslyfortwoseconds.ThemeterwillswitchON

andthescreenwilldisplay“CLr”indicatingthatallofthe99memorylocationshavebeen

erased.

DataHold

PresstheHoldbuttontofreezethedisplayedreading(the‘HOLD’iconwillswitchON).Pressthe

buttonagaintoreleasetheheldreading(the‘HOLD’iconwillswitchOFF).



LT45-en-EU_V1.5 9/14

LuminousIntensity(CD)Measurements

1. PresstheOn/OffbuttontoturnpowerON.

2. PressandholdtheLX/FC/CDbuttonuntilthemeter’sunitdesignatorswitchestoCD.

3. Usethearrowbuttonstoselectft(feet)orm(meter)unitstorepresentthedistancethe

sensorwillbefromthelightsource.

4. MomentarilypresstheLX/FC/CDbutton;thesmallerdigits(lower‐righthandcornerofLCD)

willswitchON,thesedigitsrepresentthedistancetothelightsource.

5. Usethearrowbuttonstosetthedistancefromthecenterofthelamptothemeasurement

baselevel.Pressandholdanarrowbuttontoscrollquickly.

6. MomentarilypresstheLX/FC/CDbutton.

7. Removetheprotectivesensorcapandplacethesensorperpendiculartothelightatthe

programmeddistance.

8. ReadtheLuminousIntensitycalculationonthemeter’sLCDdisplay.

9. PressandholdtheLX/FC/CDbuttontoexitthismode.

LuminousIntensity=illumination(Lx)xdistance(ft2orm2)

Theprogrammabledistancerangeis0.01~30.47m(0.01~99.99ft.)

LightSource(L.S.)Selection

Thereare10lightsourceselections(L0–L9)eachhavingauniquecalibrationcorrectionfactor

(multiplier).SeetheLightSourceFactorslistbelow.ThemultipliersforlocationsL0throughL6

arefixedforthelightingtypeslisted.LocationsL7throughL9areextralocationsthattheuser

cancustomize(withamultiplierfrom0.001to1.999).Tochangethelightsource(L.S.)selection:

1. PressandholdtheHold/LSbuttonfor2seconds.Thelightsourcecode,atthebottomcenter

oftheLCD,willflash.UsethearrowbuttonstoselectL0throughL9.Thelocation’smultiplier

(correctionfactor)willbeshowntotherightoftheLxvalue(L8…1000,forexample).

2. Tocustomizealocation,selectL7,L8orL9and,onceselected,momentarilypressthe

Hold/LSbuttontoenterthemultiplierprogrammingmode.Nowusethearrowkeysto

changethemultiplier.Pressandholdanarrowbuttontoscrollfaster.

3. Whenfinished,pressandholdtheHold/LSbuttonforatleast1secondtoconfirmtheedit

andexitthismode.

LightSourceFactors

L0:Standardlightsource:1.00.

L1:LEDwhitedaylight:0.99.

L2:LEDREDlight:0.516.

L3:LEDAMBER(YELLOW)light:0.815.

L4:LEDGREENlight:1.216.

L5:LEDBLUElight:1.475.

L6:LEDPURPLElight:1.148.

L7~L9:ProgrammableUserCustomLocations(presetto1.00)

LT45-en-EU_V1.5 9/14

MeasurementConsiderationsandUserTips

Formaximumaccuracyallowthelightbeingmeasuredtofalldirectlyonthesensoras

perpendicularaspossiblewithaminimalangleofincidence.



Whenthemeterisnotinuse,pleasekeeptheprotectivecapinplace,coveringthelight

sensor.Thiswillprolongthelifeofthesensor.

Whenthemeteristobestoredforlongperiods,pleaseremovethebatteryandstoreit

separately.Batteriescanleakandcausedamagetothemeter’scomponents.

Avoidareasofhightemperatureandhumiditywhenusingthisinstrument.



BatteryReplacementandMaintenance

Cleaningandstorage

1. Thewhiteplasticsensordomeshouldbecleanedwithadampclothwhennecessary.Use

onlyamildsoapifneeded.Donotusesolvents,abrasives,orharshdetergentstocleanthe

dome.

2. Storethemeterinanareawithmoderatetemperatureandrelativehumidity.

BatteryReplacement

Whenthebatterypowerdecreasestoacriticallevel,thebatterysymbolwillappearasemptyon

theLCD.Replacethe9Vbatterylocatedintherearbatterycompartment.Thebattery

compartmentslideseasilydownwardforremoval(inthedirectionoftheprintedarrowonthe

rearofthemeter).Ensurethatthecompartmentcoverissecurelyfastenedbeforeusingthe

meter.

Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriate

collectionsites,theretailstorewherethebatterieswerepurchased,orwherever

batteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotake

end‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronic

equipment.



BatterySafetyReminders

oPleasedisposeofbatteriesresponsibly;observelocal,state,nationalregulations.

oNeverdisposeofbatteriesinafire;batteriesmayexplodeorleak.



LT45-en-EU_V1.5 9/14

Specifications

Samplingrate2.5timespersecond(digitaldisplay)

Display6‐digitLCDwithbatteryicon,measurementoverload,and

otherfunctionindicators

Sensor(detector)Siliconphotodiodewithspectralresponsefilterandcosine

correction

RangesandResolutionLux:399.9,3999,*39999,*399999

Foot‐candles:39.99,399.9,3999,*39999

*Above3999,theLCDusessmallerdigitsontherightside

(1Fc=10.76Lux)

Auto‐rangeThemeterautomaticallyrangesthedisplay

Accuracy±(3%ofreading+3digits)upto500Lux

±(3%)above500Lux

Calibratedtostandardincandescentlamp2856oKatan

ambienttemperatureof23oC

±6%+3digitsforothervisiblelightsources

Angledeviationfromcosine

characteristics

30○ ±2%

60○±6%

80○±25%

LEDTypes Metermeasureswhite,red,yellow,green,blue,purpleLEDlight

OperatingconditionsTemperature:5to40oC(41to104oF);Humidity:<80%RH

StorageTemperature/RH‐10to60oC(14to140oF);Humidity:<70%RH

BatterystatusindicationBatterysymbolappearsemptywhenbatteryvoltagereachescriticallevel

Powersupply 9Vbattery

AutoPowerOFF Meterpowersdownafter5minutesofinactivity(canbedefeated)

Dimensions Meter:38x55x130mm(1.5x2.2x5.1”)

Sensor:25x44x80mm(9.8x2.2x3.1”)

Cablelength:1.5m(4.9ft.)

WeightApprox.250g(8.8oz.)withbatteryinstalled

LT45-en-EU_V1.5 9/14

Appendix

TypicalLightLevels

LuxFoot

Candles

LuxFoot

Candles

FactoriesHome

20‐752‐7EmergencyStairs,Warehouse 100‐15010‐15Washing

75‐1507‐15Exit/EntrancePassages150‐20015‐20Recreational

Activities

150‐30015‐30PackingWork200‐30020‐30DrawingRoom,

Table

300‐75030‐75VisualWork:ProductionLine300‐50030‐50Makeup

750‐1,50075‐150Typesetting:InspectionWork500‐1,50050‐150Reading,Study

1,500‐3,000150‐300ElectronicAssembly,Drafting1,000‐2,000100‐200Sewing

OfficeRestaurant

75‐1007‐10IndoorEmergencyStairs75‐1507‐15CorridorStairs

100‐20010‐20CorridorStairs150‐30015‐30Entrance,

WashRoom

200‐75020‐75Conference,

ReceptionRoom

300‐75030‐75CookingRoom,

DiningTable

750‐1,50075‐150ClericalWork750‐1,50075‐150ShowWindow

1,500‐2,000150‐2000Typing,Drafting

StoreHospital

75‐1507‐15Indoors30‐753‐7EmergencyStairs

150‐20015‐20Corridor/Stairs75‐1007‐10Stairs

200‐30020‐30Reception100‐15010‐15SickRoom,

Warehouse

300‐50030‐50DisplayStand150‐20015‐20WaitingRoom

500‐75050‐75Elevator200‐75020‐75MedicalExamRoom

750‐1,50075‐150ShowWindow,

PackingTable

750‐1,50075‐150OperatingRoom

1,500‐3,000150‐300Storefront,ShowWindow5,000‐10,000 500‐1000EyeInspection

SpectralSensitivity

Peaksensitivitywavelength:550nm

Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

www.extech.com

RELATIVE SENSITIVITY (%)

WAVELENGTH (nm)

LT45

Autres manuels pour LT45

Table des matières

Autres manuels Extech Instruments Instrument de mesure

Extech Instruments

Extech Instruments EA30 Manuel utilisateur

Extech Instruments

Extech Instruments CO100 Manuel utilisateur

Extech Instruments

Extech Instruments PQ3450-30 Manuel utilisateur

Extech Instruments

Extech Instruments AN10 Manuel utilisateur

Extech Instruments

Extech Instruments 461920 Manuel utilisateur

Extech Instruments

Extech Instruments 382400 Manuel utilisateur

Extech Instruments

Extech Instruments 461923 Manuel utilisateur

Extech Instruments

Extech Instruments 461920 Manuel utilisateur

Extech Instruments

Extech Instruments 407730 Manuel utilisateur

Extech Instruments

Extech Instruments 407740 Manuel utilisateur

Extech Instruments

Extech Instruments 380652 Manuel utilisateur

Extech Instruments

Extech Instruments 407117 Manuel utilisateur

Extech Instruments

Extech Instruments 382152 Manuel utilisateur

Extech Instruments

Extech Instruments 381235 Manuel utilisateur

Extech Instruments

Extech Instruments AN100 Manuel utilisateur

Extech Instruments

Extech Instruments RH520B Manuel utilisateur

Extech Instruments

Extech Instruments AN100-NIST Manuel utilisateur

Extech Instruments

Extech Instruments CO10 Manuel utilisateur

Extech Instruments

Extech Instruments 382095 Manuel utilisateur

Extech Instruments

Extech Instruments 407113 Manuel utilisateur

Extech Instruments

Extech Instruments ExStik DO600 Manuel utilisateur

Extech Instruments

Extech Instruments HD300-NISTL Manuel utilisateur

Extech Instruments

Extech Instruments 380801 Manuel utilisateur

Extech Instruments

Extech Instruments UV505 Manuel utilisateur

Manuels Instrument de mesure populaires d'autres marques

Suaoki

Suaoki D40 Manuel utilisateur

Elster

Elster BK-G1.6 Manuel utilisateur

Endress+Hauser

Endress+Hauser Deltabar FMD71 Manuel

Duratool

Duratool D03128 Manuel utilisateur

Vega

Vega VEGAPULS 65 Manuel utilisateur

Tonghui

Tonghui TH2618B Manuel utilisateur

Tenmars

Tenmars TM-801 Manuel utilisateur

MSR

MSR 145 Manuel utilisateur

TPS

TPS WP-82 Manuel utilisateur

ELMETRON

ELMETRON CP-511 Manuel utilisateur

PCB Piezotronics

PCB Piezotronics 003C30 Manuel utilisateur

Tenma

Tenma 72-10465 Manuel utilisateur

Endress+Hauser

Endress+Hauser Proline Promag 50 Caractéristiques techniques

Siemens

Siemens SITRANS F Coriolis FCT030 Manuel de la liste des pièces

KLINGER

KLINGER CMF V Series Manuel utilisateur

EXFO

EXFO FTB-2 Manuel d'exploitation et d'entretien

Keysight

Keysight M8290A Manuel utilisateur

ADTEK

ADTEK MW-5 Manuel utilisateur