Extech Instruments LT40 Manuale utente

USERMANUAL



WhiteLEDLightMeter



ModelLT40



AdditionalUserManualTranslationsavailableatwww.extech.com

LT40-en-GB_V3.0 10/17

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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: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Calibration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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’).

LT40-en-GB_V3.0 10/17

MeterDescription

1. Photodetector(removeprotectivecovertoexposesensor)

2. Display(LCD)

3. Controlpush‐buttons

4. PowerButton:ON/OFF



Batterycompartmentandtripodmountarelocatedon

rearofinstrument



Push‐ButtonDescription

1. Lux/Fcunitsselector

2. ZeroCalibrationbutton

3. Maximum/Average/Minimummemorybutton

4. Dataholdbutton

Operation

PowerON/OFF 

LongpressthePowerbuttontopowerthemeter.TopowerthemeterOFF,shortpressthe

Powerbutton.

TakingMeasurements

1. SwitchthemeterONandremovethesensor’sprotectivecovertoexposethelightsensor

dome.ThedisplayshouldswitchON;ifnot,checkthatbatteriesareinstalledandfresh.

2. Themetermeasurestheintensityofthelight(illuminance)thatstrikesthesensordomein

foot‐candlesandLuxunits(1fc=10.76lux),displayingthismeasuredvalueonitsLCD.

3. Positionthemeterandlightsourcesothatthelightstrikesthesensordomestraighton

(perpendicular)withaslittleanangleaspossible.

4. Themeter’sdisplaycanshowavalueupto9999.However,forreadingsthatrepresent

measurementshigherthanthis,themeterusesx10orx100feature.Forexample,to

representameasurementof11,000fcthemeterwilldisplay1100withthex10indicator.

LT40-en-GB_V3.0 10/17

AutoPowerOFF

Tosavebatterylife,themeterpowersdownautomaticallyafterapproximately12minutesof

inactivity.

Enable/DisableAutoPowerOff

WhilethemeterisON,longpressthePowerbuttontodisabletheAutoPowerOFFutility(the

ClocksymbolwillswitchOFF).ToenabletheAutoPowerOFFutility,repeatthisprocess.

LUX/FCButton

PresstheLUX/FCbuttontotogglebetweenLuxandFC(foot‐candles)measurementunits.

MAX/MINButton

Themetercanrecordthemaximum,minimum,andaveragereadingsasdescribedbelow:

1. Shortpressthe“MAX/MIN”buttonandthemeterwillbegintotrackthe

maximum/average/minimummeasurements;the“MAX”iconwilldisplayatthetopofthe

LCDwindowindicatingthatthemeterisnowshowingthemaximumreading.Thereading

willnotchangeuntilahigherreadingisregistered.

2. Pressthe“MAX/MIN”buttonagaintoswitchfrom“MAX”to“AVG”,wherethemeterwill

showtheaveragemeasurementvalue.The“AVG”iconwillbedisplayedabovethedisplayed

value.

3. Pressthe“MAX/MIN”buttonagaintochangethemodefrom“AVG”to“MIN”,wherethe

meterwillshowtheminimumvaluemeasured.The“MIN”iconwillbedisplayed.

4. Pressthe“MAX/MIN”buttonagaintoswitchfrom“MIN”backto“MAX”.

5. Toexitthismode,holdthe“MAX/MIN”buttonforatleast2seconds.TheMAX/AVG/MIN

iconsshouldallbeswitchedOFFwhentheunitreturnstothenormaloperatingmode.

HOLDButton

PresstheHOLDbuttontofreezethecurrentreadingontheLCD.PresstheHOLDbuttonagainto

releasethereading.IntheDataHoldmode,HOLDisdisplayedontheLCD.

ZeroCalibrationProcedure

1. Ensurethattheprotectivecapisattachedtothelightsensor.

2. PowerthemeterandtheLCDshoulddisplay‘0’.

3. Shortpressthe“CALZERO”buttontoperformthezeroadjustment(CALwillappearonthe

display).

4. TheCALdisplaywillswitchoffwhenthecalibrationhasbeencompleted.

5. IftheprotectivecapisnotcoveringthesensorwhentheZerocalibrationisstartedtheLCD

displaywillreadCAP.Inthiscase,pleasecoverthesensorwiththecapandrestartthis

procedure.



LT40-en-GB_V3.0 10/17

MeasurementConsiderationsandUserTips

Formaximumaccuracyallowthelightbeingmeasuredtofalldirectlyonthesensoras

perpendicularaspossiblewithaminimalangleofincidence.



Whenthemeterisnotinuse,pleasekeeptheprotectivecapinplaceoverthelightsensor.This

willprolongthelifeofthesensor.

Whenthemeteristobestoredforlongperiods,pleaseremovethebatteriesandstorethem

separately.Batteriescanleakandcausedamagetothemeter’scomponents.

Avoidareasofhightemperatureandhumiditywhenusingthisinstrument.



BatteryReplacementandMaintenance

Cleaningandstorage

1. Thewhiteplasticsensordomeshouldbecleanedwithadampclothwhennecessary.Use

onlyamildsoapifneeded.Donotusesolvents,abrasives,orharshdetergentstocleanthe

dome.

2. Storethemeterinanareawithmoderatetemperatureandrelativehumidity.

BatteryReplacement

Whenthebatterypowerdecreasestoacriticallevel,thelowbattery

symbol“”willappearontheLCD.Replacethe2x1.5VAAA

batterieslocatedintherearbatterycompartment.

1. Pressandholdthebatterycompartmentlockbutton(seediagram).

2. Slidethebatterycompartmentcoveroffinthedirectionofthe

arrow.

Installtwo(2)1.5V‘AAA’batteriesobservingcorrectpolarityandclose

thebatterycompartment.Ensurethatthecompartmentcoverissecurely

fastenedbeforeusingthemeter.



Neverdisposeofusedbatteriesorrechargeablebatteriesin

householdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriate

collectionsites,theretailstorewherethebatterieswerepurchased,orwherever

batteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuserisobligatedtotake

end‐of‐lifedevicestoadesignatedcollectionpointforthedisposalofelectricalandelectronic

equipment.

LT40-en-GB_V3.0 10/17

Specifications

UnitsRangeResolutionAccuracy

Lux



999.90.1WhiteLED:

±(3%reading+3Lux)upto500Lux

±(3%reading)>500Lux

Otherlightsources:Unspecified

9,9991

99,990*10

400,000*100

Foot

candles

99.990.01WhiteLED:

±(3%reading+0.3Fc)upto46Fc

±(3%reading)>46Fc

Otherlightsources:Unspecified

999.90.1

9,9991

40,000*10

*Readingsabove9999useax10orx100multiplier(1Fc=10.76Lux)

Angledeviationfromcosine

characteristics

30°±2%

60°±6%

80°±25%

GeneralSpecifications

Samplingrate2.5timespersecond(digitaldisplay)

PhotodetectorSiliconphoto‐diodewithcosinecorrection

Display4‐digitLCD(maximumdisplay:9999)withlowbatteryicon,

measurementoverload,andotherfunctionindicators

AutoRangeMeterautomaticallyrangesthedisplay

OperatingconditionsTemperature:5to40oC(41to104oF);Humidity:<80%RH

StorageconditionsTemperature:‐10to60oC(14to140oF);Humidity:<70%RH

LowbatteryindicationappearsontheLCDwhenbatteryvoltagefallscriticallylow

LEDType WhiteLEDlight

Powersupply2x1.5V‘AAA’batteries

BatterylifeApproximately200hours

AutoPowerOFFMeterswitchesOFFafter12minutesofinactivity

Dimensions133x48x23mm(5.2x1.9x0.9”)

Weight250g.(8.8oz.)includingbatteries

LT40-en-GB_V3.0 10/17

Appendices

TypicalLightLevels(1Fc=10.76Lux)

LuxFoot

Candles

LuxFoot

Candles



 Factories Home

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Work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

 StoreHospital

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







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

ISO‐9001Certified

www.extech.com 

Altri manuali per LT40

Indice

Altri manuali Extech Instruments Strumento di misura

Extech Instruments

Extech Instruments PQ3450-2-NIST Manuale utente

Extech Instruments

Extech Instruments MA3010 Manuale utente

Extech Instruments

Extech Instruments VB450 Manuale utente

Extech Instruments

Extech Instruments 407355 Manuale utente

Extech Instruments

Extech Instruments 380580 Manuale utente

Extech Instruments

Extech Instruments LT10 Manuale utente

Extech Instruments

Extech Instruments PH210 Manuale utente

Extech Instruments

Extech Instruments 382152 Manuale utente

Extech Instruments

Extech Instruments ExStik SX800 Series Manuale utente

Extech Instruments

Extech Instruments AM600 Manuale utente

Extech Instruments

Extech Instruments BR250 Manuale utente

Extech Instruments

Extech Instruments MA130 Manuale utente

Extech Instruments

Extech Instruments RH520B Manuale utente

Extech Instruments

Extech Instruments MO210 Manuale utente

Extech Instruments

Extech Instruments MA145 Manuale utente

Extech Instruments

Extech Instruments SDL600 Manuale utente

Extech Instruments

Extech Instruments RH300 Manuale utente

Extech Instruments

Extech Instruments EX650 Manuale utente

Extech Instruments

Extech Instruments PQ3450-30 Manuale utente

Extech Instruments

Extech Instruments ExStik DO600 Manuale utente

Extech Instruments

Extech Instruments 461920 Manuale utente

Extech Instruments

Extech Instruments EN150 Manuale utente

Extech Instruments

Extech Instruments MO750 Manuale utente

Extech Instruments

Extech Instruments 407113 Manuale utente

Manuali Strumento di misura popolari di altre marche

Suaoki

Suaoki D40 Manuale utente

Elster

Elster BK-G1.6 Manuale utente

Endress+Hauser

Endress+Hauser Deltabar FMD71 Manuale

Duratool

Duratool D03128 Manuale utente

Vega

Vega VEGAPULS 65 Manuale utente

Tonghui

Tonghui TH2618B Manuale utente

Tenmars

Tenmars TM-801 Manuale utente

MSR

MSR 145 Manuale utente

TPS

TPS WP-82 Manuale utente

ELMETRON

ELMETRON CP-511 Manuale utente

PCB Piezotronics

PCB Piezotronics 003C30 Manuale utente

Tenma

Tenma 72-10465 Manuale utente

Endress+Hauser

Endress+Hauser Proline Promag 50 Specifiche tecniche

Siemens

Siemens SITRANS F Coriolis FCT030 Manuale elenco delle parti

KLINGER

KLINGER CMF V Series Manuale utente

EXFO

EXFO FTB-2 Manuale operativo e di manutenzione

Keysight

Keysight M8290A Manuale utente

ADTEK

ADTEK MW-5 Manuale utente