Extech Instruments LT40 User Manual

LT40-en-GB_V3.0 10/17
2
Introduction
CongratulationsonyourpurchaseoftheExtechLT40LEDLightMeterthatmeasureslightintensity
fromwhiteLEDlightsources.TheLT40canalsomeasurelightfromfluorescent,metalhalide,high‐
pressure sodium, and incandescent sources, for reference only (unspecified accuracy). The LT40
can measure light up to 40,000 Fc (400,000 Lux). This instrume
nt 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:TheLCDwillshowOL.
 LowbatteryIndication.
 DisplayUpdateRate:2.5timespersecond.
 CosineAnglecorrected.
 MeasureswhiteLEDlight.
 MeasurestheintensityofilluminationinLuxorfoot‐candles.
 Dataholdfreezesdisplayedreading.
 Maximum/Average/MinimumreadingHold.
 ZeroCalibrati
on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lowbatterysymbolappearsontheLCD.
 Donottouchthemeter’scircuitboardforanyreason;staticel
ectricityorcontam
ination
coulddamagethesensitivecomponents.
 ForIndooruseonly.Thisinstrumentwasdesignedforpollutiondegree2.
 OperationAltitude:Upto2000m(7000’).
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Extech Instruments LT40 Specifications

General

Brand	Extech Instruments
Model	LT40
Category	Measuring Instruments
Language	English