Extech Instruments LT40 Manuale utente

USERMANUAL



WhiteLEDLightMeter



ModelLT40



www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.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’).

www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

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.

www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

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.



www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

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.

www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

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

www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

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

www.GlobalTestSupply.com

Find Quality Products Online at: sales@GlobalTestSupply.com

Altri manuali per LT40

Indice

Altri manuali Extech Instruments Strumento di misura

Extech Instruments

Extech Instruments MA640 Manuale utente

Extech Instruments

Extech Instruments UM200 Manuale utente

Extech Instruments

Extech Instruments 407780A Manuale utente

Extech Instruments

Extech Instruments GX900 Manuale utente

Extech Instruments

Extech Instruments AN320 Manuale utente

Extech Instruments

Extech Instruments MO297 Manuale utente

Extech Instruments

Extech Instruments SDL400-NIST Manuale utente

Extech Instruments

Extech Instruments CO80 Manuale utente

Extech Instruments

Extech Instruments CO210 Manuale utente

Extech Instruments

Extech Instruments BR250 Manuale utente

Extech Instruments

Extech Instruments HT30 Manuale utente

Extech Instruments

Extech Instruments HT200 Manuale utente

Extech Instruments

Extech Instruments AUT10 Manuale utente

Extech Instruments

Extech Instruments VFM200 Manuale utente

Extech Instruments

Extech Instruments 341350A Manuale utente

Extech Instruments

Extech Instruments HD780 Manuale utente

Extech Instruments

Extech Instruments DT200 Manuale utente

Extech Instruments

Extech Instruments 451112 Manuale utente

Extech Instruments

Extech Instruments 407820 Manuale utente

Extech Instruments

Extech Instruments 406800 Manuale utente

Extech Instruments

Extech Instruments FHT200 Manuale utente

Extech Instruments

Extech Instruments LT505 Manuale utente

Extech Instruments

Extech Instruments 401036 Manuale utente

Extech Instruments

Extech Instruments RH300 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