Extech Instruments LT10 User manual

USERGUIDE



PocketLightMeter



ModelLT10



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2LT10‐en‐GB_v1.14/15

Introduction



ThankyouforselectingtheExtechInstrumentsModelLT10PocketLightMeter.TheLT10measuresand

displayslightintensityinfootcandleandLuxunitsusingaprecisionphoto‐diodesensor.Thisdevice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.TheExtechInstrumentsbrand,

awhollyownedsubsidiaryofFLIRSystems,Inc.,isISO‐9001certified.

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Safety



UseCAUTIONwhenoperatingthisdevice.Thelightsensorissensitiveandshouldbehandledwithgreat

care.



MeterDescription



1. Photodetector(LightSensor):Sensorcontainsalonglifesilicon

photodiode

2. MAX‐LUX/fcfunctionbutton:Pressbuttonmomentarilytoview

themaximum(MAX)reading.Pressthebuttonmomentarily

againtoreleasetheMAXdisplayandreturntothenormal

operatingmode.Pressandholdthisbuttonforatleast2seconds

toswitchbetweenLUXandfc(footcandle)unitsofmeasure.

Notethat1fc=10.76LUX).

3. LCDBacklightControlSensor:ThemeterswitchestheLCD

backlightONandOFFautomaticallybasedonenvironmental

lightingconditions.

4. LCDdisplay:1999count,backlitLCDwithLUX,fc,MAX,andlow

batteryicons.

5. Powerbutton:PresstoswitchtheunitONorOFF.

Note:Batterycompartmentandtripodmountarelocatedonrearof

instrument.

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Operation



TurnPowerONorOFF

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

installedandisfresh.

SelectingLUXorFootcandle(fc)unitsofmeasure

PressandholdtheMAX‐LUX/fcbuttonforatleast2secondstoswitchbetweenLUXandFcunits.

MeasurementProcedure

1. SwitchthemeterONandpositionthelightsensortocapturethelightthatistobemeasured.

2. ThedisplaywillindicatethelightlevelinFcorLUXunits.

3. Themeterautomaticallyselectsthecorrectrange.Ifthe‘OL’iconappears,thelightmeasurementisout

ofrangeandcannotbemeasuredaccurately.

4. Ifthex10orx100indicatorappears,multiplythedisplayedvaluebythecorrespondingmultiplierto

obtainthecorrectmeasurementvalue.

MaxHold

MomentarilypresstheMAX‐LUX/fcbuttontoviewthehighestreading(MAX)encounteredsincethemeter

waslastswitchedON.Pressthebuttonagaintoreturntothenormaloperatingmode.ToresettheMAX

reading,switchthemeterOFFandthenONagain.

LCDBacklight

ThemeterautomaticallycontrolstheLCDbacklighting(ONandOFF)tomatchtheavailableambientlighting.



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BatteryReplacement

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Whenthebatterypowerbeginstofail,thelowbatterysymbolwillappearontheLCD.Replacethe9V

batterybyfollowingthesesteps.

1. Opentherearbatterycompartmenttoaccessthebattery

2. Replacethe9Vbattery,carefullysecuringthebatteryinthecompartment

3. Securelyfastenthecompartmentcover

4. Ensurethatthecompartmentcoverissecurelyfastenedbeforeusingthemeter



AllEUusersarelegallyboundbytheBatteryOrdinancetoreturnallusedbatteriestocommunity

collectionpointsorwhereverbatteries/accumulatorsaresold.

Disposalinhouseholdtrashorrefuseisprohibited.

Disposal:Followthevalidlegalstipulationsinrespectofthedisposalofthedeviceattheendofits

lifecycle



BatterySafetyReminders

Pleasedisposeofbatteriesresponsibly;alwaysobservelocal,state,andfederalregulationswithregard

tobatterydisposal.

Neverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.

Nevermixbatterytypesoroldandnewbatteries.Alwaysinstallnewbatteriesofthesametype.







Shop for Extech products at: 1.888.610.7664

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Specifications



GeneralSpecifications

Display1999CountBacklitLCDwithLUX,fc,battery,andMAXindicators

DisplayPolarityAutomaticallydetectspolarity;displays(‐)fornegativepolarity

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

LowBatteryIndicationBatteryiconappearswhenbatteryvoltageisbelowoperatinglevel

Measurementrate2.5readingspersecond,nominal

MeasurementRepeatability±2%

MAXindicationDisplayshighestreading

Temperaturecoefficient±0.1%peroC

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

SensorCalibrationCalibratedtostandardincandescentlamp;colortemperature2856k

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

Powersupply9Vbattery

AutoPowerOffMeterautomaticallyswitchesoffafter17minutesofinactivity

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

StorageconditionsTemperature:‐10to60oC(14to140oF);Humidity:<80%RH

Dimensions157(H)x54(W)x34(D)mm(6.2x2.1x1.3")

Weight170g(6oz.)



ElectricalSpecifications

RangesandResolutionAccuracy

LUX±(5%reading+10digits(<10000LUX/fc)

±(10%reading+10digits(>10000LUX/fc)

Notethatreadingsover1999willshowthex10orx100multiplier.

Inthesecases,multiplythedisplayedvaluebythemultiplierto

obtainthecorrectreading.

200.0,2000,20000,40000

Footcandles(Fc)

20.0,200.0,2000,4000



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

www.extech.com

Shop for Extech products at: 1.888.610.7664

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6LT10‐en‐GB_v1.14/15

Appendices

TypicalLightLevels

Lux Foot

Candles

Lux Foot

Candles

Factories

Homes

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 Wor

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

Stores

Hospitals

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

0.8

0.6

0.4

0.2

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