LT300 EU EN V2.3 667399 Installation

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USERGUIDE

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DigitalLightMeter

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ModelLT300

LT300-EU-EN V2.3 2/13

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Introduction

CongratulationsonyourpurchaseoftheExtechLT300DigitalLightMeter.TheLT300measures

lightlevel(illuminance)to400,000Lux(40,000Fc).TheLT300offersabacklitdisplay,MAX/MIN,

DataHold,Relative,Peak,andReset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.

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MeterDescription

1. Sensorcable

2. Analogbargraph

3. Numericaldisplay

4. RANGEbutton

5. ON/OFFbutton

6. MAX/MINbutton

7. RESETbutton

8. LCDBacklightbutton

9. LUXbutton

10. Fcfootcandlebutton

11. Protectiverubberjacket

12. RELATIVEbutton

13. DataHOLDbutton

14. PEAKbutton

15. Photosensordome

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Notes:Protectivesensorcapnotshown.Batterycompartment,TiltStand,andTripodMount

arelocatedontherearoftheinstrument.Theprotectiverubberjacketmustberemoved

frommetertoaccessbatterycompartment.

LT300-EU-EN V2.3 2/13

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Operation

Lightsensor

1. Thelightsensorispermanentlyattachedto

themeterbythecoiledcable.

2. Removetheprotectivecapbyunsnappingit

toexposethewhitedomedlightsensor.

Whenthesensor’sprotectivecapisremoved,thewhitedomedlightsensorlenswillbeginto

capturelight.Replacethecapwhenthemeterisnotinuse.

TurnPowerONorOFF

Pressthebuttontoturnpoweronoroff.Ifthedisplaydoesnotswitchon,checkthatthe9V

batteryisinstalledandisfresh.

SelectingLuxorFootcandleunitsofmeasure

PresstheLUXbuttontoselectluxunitsortheFcbuttontoselectfootcandleunits.

MeasurementProcedure

1. Removetheprotectivecapfromthesensorsothatthewhitedomedlightsensorisexposed

tothelight.Foroverheadlighting,thesensorcanbeplacedonadeskortabletop.Atripod

mountandatiltstandarelocatedontherearofthemeterforconvenience.

2. ThedisplaywillindicatethelightlevelinFcorLux.

3. PresstheRANGEbuttontoselecttherangethatprovidesthemaximumresolution.Ifthe

‘OL’appearsthelightmeasurementisoutofrange.SelectanotherrangeusingtheRANGE

button.

4. PressthebacklightbuttontoilluminatetheLCDdisplayifneeded.

MAX/MIN

TheMax/Minfunctionallowsforrecordinganddisplayofthemaximumandminimumlight

levelsovertime.

1. PresstheMAX/MINbutton.TheMAXdisplayiconwillappearandmeterwillnowdisplay

andholdonlythehighestreading.Thedisplaywillupdateonlywhenahigherreadingis

measured.

2. PressMAX/MINbutton.TheMINdisplayiconwillappearandmeterwillnowdisplayand

holdonlythelowestreading.Thedisplaywillupdateonlywhenalowerreadingismeasured

3. PressMAX/MINagain.TheMAXMINdisplayiconswillappearflashingandmeterwillnow

displaythecurrentreading,butwillcontinuetorecordthehighestandlowestvalues.

4. PressMAX/MINagaintocyclethroughMAXandMINdisplays.

5. ToexittheMAXMINmode,pressandholdtheMAX/MINbuttonuntiltheMAXandMIN

iconscompletelydisappear.

DataHold

PresstheHOLDbuttontofreezethedisplayedreading.The”MANUHOLD”holdiconwillappear

onthedisplay.PresstheHOLDbuttonagaintoreturntonormaloperation.WhentheDataHold

functionisenabledtheanalogbargraphwillcontinuetodisplaylevelchanges.

LT300-EU-EN V2.3 2/13

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PeakHold

ThePeakHoldfeatureallowsthemetertocaptureslightpulsesthatriseorfalldownto10µs.

1. PressandholdthePEAKbuttonuntilCALappearsinthedisplay.

2. MomentarilypressthePEAKbutton.The‘PMAX’iconwillappearontheLCD.Themeterwill

thenmeasureanddisplayanylightpulses.Thedisplaywillholdtheresultsuntilahigher

pulseappears.

3. PressthePEAKbuttonagaintodisplaythe“PMIN”values.

4. ToexitthePeakHoldmode,pressandholdthePEAKbuttonuntilthe‘PMAX’or‘PMIN’icon

disappears.

Relativemode

Measurementscanbedisplayedasadifferencebetweenthemeasuredlightlevelandastored

referencevalue.Tostoreareadingasareference,presstheRELbuttonwhenthedesired

referencemeasurementisontheLCD(theRELiconwillswitchon).Allsubsequentdisplayed

readingswillbe“relative”tothestoredreferencevalue.Forexample,ifthereferencevalueis

100andtheactuallightlevelis125,themeterwilldisplay25.Toviewthereferencevalue,press

theRELbuttonagainsothattheRELiconbeginstoflash.Thedisplayedvaluewillbethe

referencevalue.ToexittheRelativemode,pressandholdtheRELbuttonuntiltheRELicon

disappears.

RESET

PresstheRESETbuttontoclearthememoryandexitfromREL,HOLD,PEAKandMAX/MIN.The

RESETwillalsoresettheautopowerofftimer.

Backlight

Pressthe““buttontoturnthebacklighton.Pressagaintoturnitoff.

LT300-EU-EN V2.3 2/13

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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humidity(refertotheoperating

andstoragerangeinthe‘Specifications’section).

BatteryReplacement

Whenthebatterypowerbeginstofailthelowbatterysymbol“”willappearontheLCD.Replace

the9Vbatterybyfirstremovingprotectivejacketthatencasesthemeter.Removetherear

(center)batterycompartmentscrewtoaccessthebatterycompartment.Ensurethatthe

compartmentcoverissecurelyfastenedandthattheprotectivejacketisproperlyinstalled

beforeusingthemeter.

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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.

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OtherBatterySafetyReminders

o Neverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.

o Nevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.

LT300-EU-EN V2.3 2/13

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Specifications

RangesandResolutionAccuracy

Lux

40.00,400.0,4000,40.00k,400.0kLux±(5%Rdg+0.5%FullScale)

Footcandle(Fc)

40.00,400.0,4000,40.00kFc±(5%Rdg+0.5%FullScale)

GeneralSpecifications

DisplayMulti‐function3‐3/4(3999)digitLCDwithBargraphindicator

OverrangeindicationLCDdisplays‘OL’

SpectralresponseCIEphotopic(CIEhumaneyeresponsecurve)

SpectralaccuracyCIEV function(f1 6%)

MeasurementRepeatability±2%

Temperaturecoefficient±0.1%peroC

Samplingrate13.3timespersecond(bargraph);1.3timespersecond(digital

display)

PhotodetectorSiliconphoto‐diodewithspectralresponsefilter

PeakHoldCapturelightpeaksto10µS

OperatingconditionsTemperature:0to40oC(32to104oF);Humidity:<80%RH

StorageconditionsTemperature:‐10to50oC(14to140oF);Humidity:<80%RH

Dimensions165x76x43mm(6.5x3.0x1.7")

WeightApprox.403g(14.2oz.)withbatteryinstalled

Lowbatteryindication“”appearsontheLCD

Powersupply9Vbattery

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Copyright©2013FLIRSystems,Inc.

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

ISO‐9001Certified

www.extech.com

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LT300-EU-EN V2.3 2/13

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Appendix

TypicalLightLevels

LuxFoot

Candles

LuxFoot

Candles

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 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





400 450 500 550 600 650 700

Wavelength (nm)

- - - - - Light Meter Response _____ CIE Response

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