User manual

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
LT40canmeasurelightupto400,000Lux(40,000Fc).TheLT40offersanoverloadindication,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)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.
 Lowbattery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LEDwhitelightandallvisiblelight.
 Measurestheintensityofilluminationin
Luxorfoot‐candles.
 Applicationsinclude:Warehouses,factories,officebuildings,restaurants,schools,library,
hospitals,photo/video,parkinggarages,museums,artgalleries,stadiums,building
security.
 Dataholdfreezesdisplayedreading.
 Maximum/Average/MinimumMemoryHold
 Zeroadjustment.
 Autopoweroffwithdisablefunction.
 Autorange.
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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’).