Extech Instruments LT10 User manual
USERGUIDE
PocketLightMeter
ModelLT10
Shop for Extech products at: 1.888.610.7664
ShopExtech.com
2LT10‐en‐GB_v1.14/15
Introduction
ThankyouforselectingtheExtechInstrumentsModelLT10PocketLightMeter.TheLT10measuresand
displayslightintensityinfootcandleandLuxunitsusingaprecisionphoto‐diodesensor.Thisdeviceis
shippedfullytestedandcalibratedand,withproperuse,willprovideyearsofreliableservice.Pleasevisitour
website(www.extech.com)tocheckforthelatestversionofthisUserGuide.TheExtechInstrumentsbrand,
awhollyownedsubsidiaryofFLIRSystems,Inc.,isISO‐9001certified.
Safety
UseCAUTIONwhenoperatingthisdevice.Thelightsensorissensitiveandshouldbehandledwithgreat
care.
MeterDescription
1. Photodetector(LightSensor):Sensorcontainsalonglifesilicon
photodiode
2. MAX‐LUX/fcfunctionbutton:Pressbuttonmomentarilytoview
themaximum(MAX)reading.Pressthebuttonmomentarily
againtoreleasetheMAXdisplayandreturntothenormal
operatingmode.Pressandholdthisbuttonforatleast2seconds
toswitchbetweenLUXandfc(footcandle)unitsofmeasure.
Notethat1fc=10.76LUX).
3. LCDBacklightControlSensor:ThemeterswitchestheLCD
backlightONandOFFautomaticallybasedonenvironmental
lightingconditions.
4. LCDdisplay:1999count,backlitLCDwithLUX,fc,MAX,andlow
batteryicons.
5. Powerbutton:PresstoswitchtheunitONorOFF.
Note:Batterycompartmentandtripodmountarelocatedonrearof
instrument.
Shop for Extech products at: 1.888.610.7664
ShopExtech.com
3LT10‐en‐GB_v1.14/15
Operation
TurnPowerONorOFF
Pressthebuttontoturnpoweronoroff.Ifthedisplaydoesnotswitchon,checkthata9Vbatteryis
installedandisfresh.
SelectingLUXorFootcandle(fc)unitsofmeasure
PressandholdtheMAX‐LUX/fcbuttonforatleast2secondstoswitchbetweenLUXandFcunits.
MeasurementProcedure
1. SwitchthemeterONandpositionthelightsensortocapturethelightthatistobemeasured.
2. ThedisplaywillindicatethelightlevelinFcorLUXunits.
3. Themeterautomaticallyselectsthecorrectrange.Ifthe‘OL’iconappears,thelightmeasurementisout
ofrangeandcannotbemeasuredaccurately.
4. Ifthex10orx100indicatorappears,multiplythedisplayedvaluebythecorrespondingmultiplierto
obtainthecorrectmeasurementvalue.
MaxHold
MomentarilypresstheMAX‐LUX/fcbuttontoviewthehighestreading(MAX)encounteredsincethemeter
waslastswitchedON.Pressthebuttonagaintoreturntothenormaloperatingmode.ToresettheMAX
reading,switchthemeterOFFandthenONagain.
LCDBacklight
ThemeterautomaticallycontrolstheLCDbacklighting(ONandOFF)tomatchtheavailableambientlighting.
Shop for Extech products at: 1.888.610.7664
ShopExtech.com
4LT10‐en‐GB_v1.14/15
BatteryReplacement
Whenthebatterypowerbeginstofail,thelowbatterysymbolwillappearontheLCD.Replacethe9V
batterybyfollowingthesesteps.
1. Opentherearbatterycompartmenttoaccessthebattery
2. Replacethe9Vbattery,carefullysecuringthebatteryinthecompartment
3. Securelyfastenthecompartmentcover
4. Ensurethatthecompartmentcoverissecurelyfastenedbeforeusingthemeter
AllEUusersarelegallyboundbytheBatteryOrdinancetoreturnallusedbatteriestocommunity
collectionpointsorwhereverbatteries/accumulatorsaresold.
Disposalinhouseholdtrashorrefuseisprohibited.
Disposal:Followthevalidlegalstipulationsinrespectofthedisposalofthedeviceattheendofits
lifecycle
BatterySafetyReminders
Pleasedisposeofbatteriesresponsibly;alwaysobservelocal,state,andfederalregulationswithregard
tobatterydisposal.
Neverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.
Nevermixbatterytypesoroldandnewbatteries.Alwaysinstallnewbatteriesofthesametype.
Shop for Extech products at: 1.888.610.7664
ShopExtech.com
5LT10‐en‐GB_v1.14/15
Specifications
GeneralSpecifications
Display1999CountBacklitLCDwithLUX,fc,battery,andMAXindicators
DisplayPolarityAutomaticallydetectspolarity;displays(‐)fornegativepolarity
OverrangeindicationLCDdisplays‘OL’
LowBatteryIndicationBatteryiconappearswhenbatteryvoltageisbelowoperatinglevel
Measurementrate2.5readingspersecond,nominal
MeasurementRepeatability±2%
MAXindicationDisplayshighestreading
Temperaturecoefficient±0.1%peroC
PhotodetectorSiliconphoto‐diodewithspectralresponsefilter
SensorCalibrationCalibratedtostandardincandescentlamp;colortemperature2856k
SpectralresponseCIEphotopic(CIEhumaneyeresponsecurve)
Powersupply9Vbattery
AutoPowerOffMeterautomaticallyswitchesoffafter17minutesofinactivity
OperatingconditionsTemperature:0to40oC(32to104oF);Humidity:<80%RH
StorageconditionsTemperature:‐10to60oC(14to140oF);Humidity:<80%RH
Dimensions157(H)x54(W)x34(D)mm(6.2x2.1x1.3")
Weight170g(6oz.)
ElectricalSpecifications
RangesandResolutionAccuracy
LUX±(5%reading+10digits(<10000LUX/fc)
±(10%reading+10digits(>10000LUX/fc)
Notethatreadingsover1999willshowthex10orx100multiplier.
Inthesecases,multiplythedisplayedvaluebythemultiplierto
obtainthecorrectreading.
200.0,2000,20000,40000
Footcandles(Fc)
20.0,200.0,2000,4000
Copyright©2013‐2015FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform
www.extech.com
Shop for Extech products at: 1.888.610.7664
ShopExtech.com
6LT10‐en‐GB_v1.14/15
Appendices
TypicalLightLevels
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
k
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
SpectralSensitivity
R
e
l
a
t
i
v
e
R
e
s
p
o
n
s
e
400 450 500 550 600 650 700
Wavelength (nm)
- - - - - Light Meter Response _____ CIE Response
1
0.8
0.6
0.4
0.2
0
Shop for Extech products at: 1.888.610.7664
ShopExtech.com
Table of contents
Other Extech Instruments Measuring Instrument manuals
Extech Instruments
Extech Instruments 461923 User manual
Extech Instruments
Extech Instruments ExStik FL700 User manual
Extech Instruments
Extech Instruments 407764 User manual
Extech Instruments
Extech Instruments AN100 User manual
Extech Instruments
Extech Instruments MA61 User manual
Extech Instruments
Extech Instruments ET38 User manual
Extech Instruments
Extech Instruments EX850 User manual
Extech Instruments
Extech Instruments 382152 User manual
Extech Instruments
Extech Instruments 407764 User manual
Extech Instruments
Extech Instruments 461895 User manual
Extech Instruments
Extech Instruments DC400 User manual
Extech Instruments
Extech Instruments 461920 User manual
Extech Instruments
Extech Instruments VB450 User manual
Extech Instruments
Extech Instruments VB400 User manual
Extech Instruments
Extech Instruments 380803 User manual
Extech Instruments
Extech Instruments MO265 User manual
Extech Instruments
Extech Instruments AN300 User manual
Extech Instruments
Extech Instruments 461891 User manual
Extech Instruments
Extech Instruments 407355 User manual
Extech Instruments
Extech Instruments MO290 User manual
