LT40-EU-EN v1.3 9/13
2
Introduction
Congratulations on your purchase of the Extech LT40 LED Light Meter that measures light from
white LED light, fluorescent, metal halide, high‐pressure sodium and incandescent sources. The
LT40canmeasurelightupto400,000Lux(40,000Fc).TheLT40offersanoverloadindication,low
battery indication, Data hold, maximum/average/minimum hold (MAX/MIN), Zero 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)tocheckforthelatestversionofthisUserGuide,ProductUpdates,and
Customer
Support.
Features
OverloadIndication:LCDscreenwillshow“OL”attheupperleft‐handcorner.
LowbatteryIndication”
”.
DisplayUpdateRate:2.5timespersecond.
SpectralresponsenearCIEluminousspectralefficiencyratings.
CosineAnglecorrected.
ConformstoJISC1609:1993andCNS5119generalclassASpecifications.
MeasuresLEDwhitelightandallvisiblelight.
Measurestheintensityofilluminationin
Luxorfoot‐candles.
Applicationsinclude:Warehouses,factories,officebuildings,restaurants,schools,library,
hospitals,photo/video,parkinggarages,museums,artgalleries,stadiums,building
security.
Dataholdfreezesdisplayedreading.
Maximum/Average/MinimumMemoryHold
Zeroadjustment.
Autopoweroffwithdisablefunction.
Autorange.
Safety
Donotoperatethemeterinenvironmentswherethefollowingarepresent:explosivegases
(ormaterials),combustiblegases(ormaterials),steam,ordust.
Pleasereplacethebatteryimmediatelywhenthesymbol“ ”appearsontheLCD.
Donottouchthemeter’scircuitboardforanyreasonasstaticelectricityorcontamination
coulddamagethesensitivecomponents.
ForIndooruseonly.Thisinstrumentwasdesignedforpollutiondegree2.
OperationAltitude:Upto2000m(7000’).
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