User’s Manual

51011/51012/51021Digital Lux Meter

IM 51011-01EN1st Edition: Feb. 2013 (YMI)

Keep this manual in a safe place so that you can refer to it when necessary.

IM 51011-01EN 1

Thank you for purchasing the digital lux meter.This user’s manual primarily explains the handling precautions and basic operations of the digital lux meter.To ensure correct use, please read this manual thoroughly before beginning operation.After reading this manual, keep it in a safe place.

Notes• Thecontentsofthismanualaresubjecttochangewithoutprior notice as a result of continuing improvements to the instrument’s performance and functionality. The figures given in this manual may differ from the acutual screen.• Everyefforthasbeenmadeinthepreparationofthismanualto ensuretheaccuracyofitscontents.However,shouldyouhave any questions or find any errors, please contact your nearest YOKOGAWA dealer.• Copyingorreproducingalloranypartofthecontentsofthis manualwithoutthepermissionofYOKOGAWAisstrictly prohibited.

Trademarks• Adobe,Acrobat,andPostScriptareeitherregisteredtrademarks ortrademarksofAdobeSystemsIncorporated.• Inthismanual,the®andTMsymbolsdonotaccompanytheir respective registered trademark or trademark names.• Othercompanyandproductnamesareregisteredtrademarks or trademarks of their respective companies.

IM 51011-01EN2

Revisions• February2013 1stEdition

1stEdition:February2013(YMI)AllRightsReserved,Copyright©2013,YokogawaMeters&InstrumentsCorporationPrintedinJapan

IM 51011-01EN 3

Checking the Contents of the PackageUnpack the box and check the contents before operating the instrument.Ifthewrongitemshavebeendelivered,ifitemsare missing,orifthereisaproblemwiththeappearanceoftheitems, contact your nearest YOKOGAWA dealer.

Digital Lux MeterCheckthattheproductthatyoureceivediswhatyouorderedby referring to the model name on the name plate.

MODEL Specifications

51011 JISClassAMeasurement ranges: 99.9/999/9,990/99,900/999,000

51012 JISClassAAMeasurement ranges: 99.9/999/9,990/99,900/999,000

51021 JISClassAAMeasurement ranges: 9.99/99.9/999/9,990/99,900/999,000

51011,51012:Single-functionmodelCompliantstandard:JISC1609-1:2006 (JIS:JapaneseIndustrialStandards)

Standard AccessoriesAA-sizealkalinebatteries(internal). . . . . . . . . . . . . . . . . . . . 2Recorderoutputplug(JC017A) . . . . . . . . . . . . . . . . . . . . . . 1Soft-sidedcase(RB038A). . . . . . . . . . . . . . . . . . . . . . . . . . . 1User’sManual(JapaneseandEnglish) . . . . . . . . . . . . . . . . 2

OptionalAccessories(Soldseparately)

Item Specifications Model

Light-detector extension cable

3m 91001

30m 91002

IM 51011-01EN4

Safety PrecautionsThe general safety precautions described herein must be observed during all phases of operation. If the instrument is used in a manner not specified in this manual, the protection provided by the instrument may be impaired. YOKOGAWA assumes no liability forthecustomer’sfailuretocomplywiththeserequirements.

The following symbols are used on this instrument.

Warning:handlewithcare.Refertotheuser’smanualor service manual. This symbol appears on dangerous locationsontheinstrumentwhichrequirespecial instructions for proper handling or use. The same symbol appears in the corresponding place in the manual to identify those instructions.

Make sure to comply with the precautions below. Not complying might result injury or death.

WARNING

Use the instrument Only for Its Intended PurposeThe lux meter is for measuring illuminances. Do not use this meter for any other purpose.

Check the Physical AppearanceDonotusethemeterifthereisaproblemwithitsphysicalappearance.

Do Not DisassembleOnly qualified YOKOGAWA personnel may disassemble this product.

Do Not Operate in an Explosive AtmosphereDo not use this meter in the presence of flammable gases or vapors. Doing so is extremely dangerous.

IM 51011-01EN 5

CAUTION•Themeterisfordomesticuse(ClassB)andmeetsthe electromagnetic compatibility requirements.•Donotdropthemeterorstrikeitagainsthardobjects.•Avoidstoringthemeterindirectsunlightorinahumidenvironment.•Usingthemeterinanlow-temperatureenvironment(–10°Cto0°C) mayslowdownthedisplay’sresponse.•Avoidusingthemeterinadirtyordustyenvironmentorinan environmentwithsaltorcorrosivegases.•Donotwipethemeterwithorganicsolvents. Dirt or dust adhering to the light-detecting surface of the meter decreases measurement accuracy. Wipethesurfacecleanwithasoft,drycloth.•Donotseparatethelight-detectorfromthemainunitwiththepower on.

IM 51011-01EN6

Conventions Used in This ManualNotes and CautionsThe notes and cautions in this manual are categorized using the followingsymbols.

Improperhandlingorusecanleadtoinjuryto the user or damage to the instrument. This symbol appears on the instrument to indicate that the user must refer to the user's manual for special instructions.

WARNING Callsattentiontoactionsorconditionsthat couldcauseseriousorfatalinjurytotheuser, and precautions that can be taken to prevent such occurrences.

CAUTION Callsattentiontoactionsorconditionsthatcould causelightinjurytotheuser,orcausedamage to the instrument or user’s data, and precautions that can be taken to prevent such occurrences.

Note Callsattentiontoinformationthatisimportantfor the proper operation of the instrument.

IM 51011-01EN 7

Measurement Category

WARNING

•Donotusethemeterformeasurementsinlocationsfalling thatfallunderMeasurementCategoriesII,III,andIV.

•Donotusethemetertomeasurevoltageorcurrent.

ThemeterisdesignedformeasurementCategoryI.

Measurement Category Description Remarks

CAT.IFormeasurementperformedon circuits not directly connected to MAINS.

Circuitsnotconnected toamainspower source.

CAT.IIFormeasurementperformedon circuits directly connected to thelow-voltageinstallation.

Appliances, portable equipment, etc.

CAT.IIIFormeasurementperformedin the building installation.

Distribution board, circuit breaker, etc.

CAT.IVFormeasurementperformedat thesourceoflow-voltage installation.

Overheadwire, cable systems, etc.

IM 51011-01EN8

ContentsCheckingtheContentsofthePackage . . . . . . . . . . . . . . . . . . . . . 3SafetyPrecautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4ConventionsUsedinThisManual . . . . . . . . . . . . . . . . . . . . . . . . . 6MeasurementCategory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.ComponentNamesandFunctions . . . . . . . . . . . . . . . . . . . . . . 92.BeforeOperation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.1MeasurementFunctions. . . . . . . . . . . . . . . . . . . . . . . . . . 142.2TurningthePowerOnandOff . . . . . . . . . . . . . . . . . . . . . 142.3SettingtheResponse. . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.4CheckingandReplacingBatteries . . . . . . . . . . . . . . . . . . 162.5AutomaticPowerOff . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162.6NotesonIlluminanceMeasurement. . . . . . . . . . . . . . . . . 18

3.NormalIlluminanceMeasurement. . . . . . . . . . . . . . . . . . . . . . 194.ColorCorrectionMeasurement(KKey) . . . . . . . . . . . . . . . . . 205.TimerHold(HOLDandT-HKeys) . . . . . . . . . . . . . . . . . . . . . . 226.RangeHold(RANGEKey) . . . . . . . . . . . . . . . . . . . . . . . . . . . 247.AverageIlluminance(AVGKey) . . . . . . . . . . . . . . . . . . . . . . . 258.DeviationDisplay(Δ/%Key) . . . . . . . . . . . . . . . . . . . . . . . . . . 279.LightSourceLuminousIntensity(cdKey) . . . . . . . . . . . . . . . . 2810. Totalized Intensity of Illumination (ACCKey). . . . . . . . . . . . . 2911.Comparator(COMPKey). . . . . . . . . . . . . . . . . . . . . . . . . . . . 3212.RippleMeasurement(S-FKey) . . . . . . . . . . . . . . . . . . . . . . . 3313.CommunicationFunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

13.1CableConnectionandInterfaceSpecifications . . . . . . . 3613.2ListofCommands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3713.3DetailedDescriptionofCommands . . . . . . . . . . . . . . . . 38

14.RecorderOutput(AnalogOutput) . . . . . . . . . . . . . . . . . . . . . 4115.SeparatingtheLightDetector . . . . . . . . . . . . . . . . . . . . . . . . 4216.SupplyingPowerthroughUSB . . . . . . . . . . . . . . . . . . . . . . . 4217.After-SalesService . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

17.1ErrorMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4317.2Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

18.DisposingtheProduct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4418.1DisposingtheProduct . . . . . . . . . . . . . . . . . . . . . . . . . . 4418.2ReplacingandDisposingBatteries . . . . . . . . . . . . . . . . 44

19.Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4520.CharacteristicsofRelativeVisible-spectrumResponse . . . . 5021.CharacteristicofObliqueIncidentLight. . . . . . . . . . . . . . . . . 5222. Illuminance Measurement Method . . . . . . . . . . . . . . . . . . . . 5323."MeasureforAdministrationofthePollutionControlof ElectronicInformationProduct"ofChina . . . . . . . . . . . . . . . 55

IM 51011-01EN 9

1. Component Names and Functions

Light-detecting surface

Display

Main unit

Hand strap

Keys

CapProtects the light-detecting surfaceUsed also during automaticzero adjustment

Light detectorCan be separatedfrom the main unit(using an extension cable)

USB port(mini B type)Use the USB cableto communicate to the PC and supply power.

POWER keyTurns the power on and off

IM 51011-01EN10

Keys

POWER ON/OFF

RANGE T - H CALL

Δ / % 1

K 2 AVG

COMP 3

c d 4

ACC C

SET S - F >

POWERON/OFF

RANGET - H Δ / %

51021 51011/51012(single-function model)

RANGE KeyUsethiskeytoswitchtherange.Pressthekeytoswitchtomanualrangemode.Therangechanges each time you press the key.To return to auto range mode, hold the keydownforatleast1second.

T-H KeyUse this key to set the timer hold-time or start the timer.

CALL KeyUsethiskeytoviewsettings.Values(shownbelow)thatarerelevanttothemeasurement functionthatyouareusingaredisplayedwhileyouholdthekey down.Colorcorrectionfactor,intensitymeasurementdistance,highand lowcomparatorlimits,andrippleratio

Δ/% KeyUse to display deviation.Pressthekeytodisplaythedeviationorpercentageofmeasurement data in reference to a reference value. To return to the normal luminance measurement, hold the key downforatleast1second.

K KeyUse this key in color correction measurement.Colorcorrectedresultsaredisplayed.Aswitchismadebetweennormalmeasurementandcolor correction measurement each time you press this key.You can also set the color correction factor.

IM 51011-01EN 11

AVG KeyUse this key in average illuminance measurement.To return to the normal illuminance measurement, hold the key downforatleast1second.

1, 2, 3, 4, and C KeysUse this key in average illuminance measurement.You can store location data for the 4-point method and 5-point method.(Locationnumberdisplay: 1 2 3 4 C )COMP KeyUsethiskeytosetthehighandlowcomparatorlimitsandtostart the comparator function.To return to the normal illuminance measurement, hold the key downforatleast1second.

cd KeyUse this key to set the light intensity distance and to display the intensity.Aswitchismadebetweennormalmeasurementandlightsource intensity measurement each time you press the key.

ACC KeyUse this key to set the limit for the totalized intensity of illumination and to display the integral time and integral value.To return to the normal illuminance measurement, hold the key downforatleast1second.

S-F KeyUse this key in ripple measurement.Aswitchismadebetweennormalmeasurementandripple measurement each time you press the key.

SET KeyUse this key to configure various settings.

Key and KeyUse these keys to move the setting position and change values.

IM 51011-01EN12

Tripod-mounting screw

Measurement reference plane indication

Battery coverHold switchHolds the measured data reading

Response selector switchSwitches the lightdetector response speedbetween FAST and SLOW

Eject buttonUsed to separatethe light detectorfrom the main unit

Recorder output connector Connect to a

recorder oroscilloscope with a dedicatedcable.

IM 51011-01EN 13

Display

1 2 3 4 C S FAVG MEMO RSPS

AUTO POWER OFF COMPRCD Go HiLoCALL SET K S-F R-H D-H

fc Slx h% mcdf t

*: When every element is showing (some elements are not used)

Element Description8,8.8.8,8.8.8 Digital display of measured, calculated, and set values

AUTOPOWEROFF Lightsinautomaticpower-offmode

Deviation

CALL LightswhenCALLispressed

SET Lights in setting mode

K Colorcorrectionfactor

RCD Lightswhenaplugisinsertedintotherecorderoutput connector

S-F Ripple measurementLo Go HiCOMP Lights in comparator mode

R-H Lights in range hold modeD-H Lights in data hold and timer hold modes

Lightswhenthebatteryvoltageislow

1 2 3 4 CAVG-MEMO- Lights during average illuminanceS FRSPS Response setting

S Timerhold-timeunit(seconds)

lx Unit for illuminance measurement

h Unit for integral time of totalized intensity of illumination

% Deviationdisplay%

m Unit for the distance to the light source

cd Unit for luminous intensity; lights during light source luminous intensity measurement

IM 51011-01EN14

2. Before Operation2.1 Measurement FunctionsThemeterhasthefollowingmeasurementfunctions.51011 Single-functionmodel

•Normalluminancemeasurement•Deviationdisplay

51012

51021

•Normalluminancemeasurement•Deviationdisplay•Colorcorrectionluminancemeasurement•Averageluminancemeasurement•Comparatorfunction•Lightsourceluminousintensitymeasurement•Totalizedintensityofillumination•Ripplemeasurement

Onlythecolorcorrectionfunctioncanbeusedincombinationwith another function. Operation of other measurement functions are notallowedexceptforthenormalluminancemeasurementand color correction measurement screens.

2.2 Turning the Power On and Off

CAUTIONCheckthatthemeteroperatesnormally.

IM 51011-01EN 15

Coverthelight-detectingsurfacewiththecap,andpressthePOWERkeytoturnonthemeter.The initial display appears. AlltheLEDelementswilllight,and[--CAL--]willappear(automaticzero-adjustmentmode).Then,thedisplayshowstheluminancemeasurement[0.00lx]display. ([0.0lx]appearsonModel51011and51012.)IfyoupressthePOWERkeyagain,themeterwillturnoff.(Seechapter3,“NormalIlluminanceMeasurement,”and section17.1,“ErrorMessages.”)

2.3 Setting the ResponseYoucansettheresponsespeedofthelightdetectorwiththeresponseselectorswitch.SettheswitchtoFASTorSLOWaccording to your application.

Switchposition

Response speed Application

FAST Approx. 10 ms

Measurement of continuous light such as daylightandinteriorlighting(fluorescentlamps,incandescentlamps).Thedisplayshows[RSPS F ].

SLOW Approx. 500 ms

Measurement of the average illuminance of flickering lights or a light that varies over timesuchasthatfromaTVscreen.Thedisplayshows[RSPS S ].

NoteIftherecorderoutputisusedforwaveformobservation,setthe switchtoFAST.

IM 51011-01EN16

2.4 Checking and Replacing BatteriesWhenthebatteryvoltagedrops,thedisplayareashowsa [ ]mark.Whenthismarkappears,replacethebatteries withnewones.Turnoffthepower,andremovethebatterycover. Checkthepolaritymarkings,andinsertthenewbatteriesin thecorrectorientation.Closethebatterycovercompletely.Batterytype:TwoAAdrycells

Battery

Main unit

Battery cover

2.5 Automatic Power OffThemeterhasanautomaticpower-offfunctiontopreventunnecessarybatteryusagewhenyouforgettoturnoffthepower. Ifthereisnokeyactivityforabout30minutes,themeterbeeps twiceandautomaticallyturnsoff. Pressinganykeywhilethemeterisbeepingextendsthetime untilthepowerturnsoffforanother30minutes.Theautomaticpower-offfunctionisdisabledwhilethetotalized intensity of illumination or comparator function is being executed orwhenaplugisinsertedintherecorderoutputconnector.Whentheautomaticpower-offfunctionisenabled, [AUTOPOWEROFF]isdisplayed.

IM 51011-01EN 17

Releasing the Automatic Power-Off Function

Coverthelight-detectingsurfacewiththecap. PresstheHOLDswitch(HOLDswitchlock)andthenthe POWERkeytoturnonthepower.Aftertheinitialdisplay,[AUTOPOWEROFF]disappearsandthe automaticpower-offfeatureisreleased.PresstheHOLDswitchagaintoreleasetheHOLDstate(lock), and perform measurements.

Reverting the Automatic Power-Off Function

PressthePOWERkeytoturnthepoweroff.Coverthelight-detectingsurfacewiththecap.(CheckthattheHOLDswitchisnotlocked.)PressthePOWERkeyagaintoturnonthepower. Aftertheinitialdisplay,[AUTOPOWEROFF]appears, andtheautomaticpower-offfunctionreturns.

IM 51011-01EN18

2.6 Notes on Illuminance MeasurementTomakeaccuratemeasurements,notethefollowingitems.• Beforestartingmeasurement,turnonthelightbulb5minutes

andthedischargelamp30minutesbeforehand.• Setthepositionandangleofthelight-detectingsurface

accurately. Themeasuringreferenceplaneisshownbelow.

EJECT35 mm

Measurement reference plane

• Becarefulthatmeasurementsarenotaffectedbywhereyou areandwhatyouarewearing.

• Foraccuratemeasurements,performcolorcorrectionwith a color correction factor that corresponds to the spectral distribution of the light source under measurement and the relative spectral response of the meter.

The meter has color correction factors for typical light sources. You can also register up to 21 correction factors that you can useforcolorcorrection.(Seechapter4,“ColorCorrection Measurement”).

• Whenyoumeasureforlongperiodoftime,thezeropointmay change due to large changes in the ambient temperature.

Insuchacase,turnoffthepoweronceandthenturniton again.(Seetheprocedureinchapter3,“NormalIlluminance Measurement.”)

IM 51011-01EN 19

3. Normal Illuminance MeasurementAutomatic Zero Adjustment1.Coverthelight-detectingsurfacewiththecap. (CheckthattheHOLDswitchisnotlocked.)2.PressthePOWERkeytoturnonthepower. Afteralltheelementslight,automaticzeroadjustmentis

executed([--CAL--]isdisplayed). Whentheadjustmentisfinished,[--CAL--]disappears. (Initialdisplayend) Theilluminancemeasurement[0.00lx]displayappears.

([0.0lx]appearsonModel51011and51012.)

Note: Ifthe[--CAP--]displaypersists,thecapmaynotbeon correctly.Putthecaponcorrectly.(Thecapmaybebroken.)

Starting to Measure3.Removethecap,andstartmeasuring.

FRSPS

AUTO POWER OFF

lx

4. When you are finished measuring, press the POWER key toturnoffthepower.Coverthelight-detectingsurfacefor protection.

Note: If[Err]appearsduringmeasurement,checkthatthelight detector is connected correctly to the main unit and that the cap is off, and then start from the beginning. (Seesection17.1,“ErrorMessages.”)

IM 51011-01EN20

4. Color Correction Measurement (K Key)This function is available on Model 51021.Eachmeterproductispre-configuredwithcolorcorrectionfactors (forstandardilluminantA)thathavebeencalculatedonthebasis of the spectral distribution characteristics and relative spectral responsecharacteristics(spectralsensitivity)forvariouslight sources. The meter automatically multiplies a color correction factorthathasbeenselectedaccordingtowhatisbeingmeasured and displays the result. In addition to the preset color correction factors,youcansetupto21(user-defined)colorcorrectionfactors. Thesefactorsremainevenwhenthepoweristurnedoff.

Light source type and name Indication (symbol)

Colorcorrectionfactor(typical)*

(1)Daylightfluorescentlamp FLd 0.994(2)Whitefluorescentlamp FW 0.996(3)Three-wayfluorescentlamp FL3 1.007(4)High-pressuremercuryvaporlamp HGL 0.993(5)High-pressuresodiumvaporlamp nAL 0.988(6)StandardlightsourceB Stb 0.996(7)StandardlightsourceC StC 0.995(8)Equal-energysource (400to760nm) Wt 0.997

(9)Userarea U1 to U21 User definition

*Thecolorcorrectionfactorsarecalculatedbasedontherelative spectraldistributionvaluesofJISZ8719,JISZ8720,andCIE No.53TC.2lamps. JIS: JapaneseIndustrialStandards CIE: CommissionInternationaledel'Éclairage (InternationalCommissiononIllumination)

IM 51011-01EN 21

Setting the Color Correction Factor1. PressSET and then K.[SET,K]appears.Thelightsource

symbol and color correction factor appear.2. Press toselectthecolorcorrectionfactor(symbol)thatyou

wanttoset. The light source symbol and color correction factor appear. If you select a factor from U1 to U21, set any value

(upto9.999)thatyouwant.Press and to set the value.3. PressSET to apply the selected color factor. The setting is

complete.[SET,K]disappears. Thecolorcorrectionfactorwillberetainedevenifyouturnoff

thepower.

Measuring1. PressK.[K]appears. While[K]isdisplayed,themetermultipliesthespecifiedcolor

correctionfactortothemeasuredvaluetoshowtheilluminance.2. Toviewthecolorcorrectionfactor,holddownCALL.3. To return to normal illuminance measurement, press K again.

[K]disappears.

Note• Thecolorcorrectionmeasurementcanbeexecutedincombination withanothermeasurementfunction. However,ifanothermeasurementfunctionisalreadyinexecution, color correction measurement is not possible. In such a case, return to normal illuminance measurement, start color correction measurement and then the other measurement function. Notethatifcolorcorrectionmeasurementisbeingexecutedwith anotherfunction,youcannotviewthecolorcorrectionfactor.• Thecolorcorrectionfactorsonthepreviouspage—(1)FLd0.994to (8)Wt0.997—aretypicalvalues.Eachmeterproducthasitsown colorcorrectionfactors(differentfromtypicalvalues),whichhave been set according to its characteristics.

IM 51011-01EN22

Holding Data (HOLD Switch)You can hold the measured value.Youcanusethisfunctionwhenthemeasuredvalueishardto read,suchaswhenyouaremeasuringinadarkplace.

Measuring1. PressHOLDtolocktheswitch.Themeasuredvalueisheld,

and[D-H]appears.2. Toreleasethehold(lock),pressHOLD.[D-H]disappears.

5. Timer Hold (HOLD and T-H Keys)Thetimerholdfunctionmakesmeasurements(holdsthevalue) after the specified time elapses.Ifwhereyouareorwhatyouarewearingisgoingtoaffectthe measurement,youmustmoveawayfromthemeter.Thisfunction enablesyoutosetthetimeneededforyoutomoveawayfromthe meter so that you can make accurate measurements. 51011and51012timersetting:5seconds(fixed) 51021timersetting:000to999seconds(asspecified)

Setting the Timer (on Model 51021)1. PressSET and then T-H. [SET,D-H,S]appears.2. Press and toenterthetime(value).

The range is 000 to 999 seconds.3. PressSETtofinishsettingthetimer.[SET,D-H,S]disappears. Thetimervaluewillberetainedevenifyouturnoffthepower.

IM 51011-01EN 23

Measuring1. PressHOLD(theswitchwillbeheldinthepressedstate).

[D-H]appears.2. PressT-Htostartthetimer.[D-H]startsblinking. When the specified time elapses, the meter beeps and holds

themeasuredvalueatthatpoint.[D-H]stopsblinking. To make another measurement, press T-H again.3. To release the timer hold, press HOLD again. [D-H]disappears,andthemeterreturnstonormal

measurement mode.

IM 51011-01EN24

6. Range Hold (RANGE Key)Youcanswitchbetweenautorangeandmanualrangemodes. In manual range mode, you can specify a fixed range.Ifmeasuredvaluesareknowntobewithinaparticularrange, you can use a fixed range to increase the meter response.

Range configurations:

51021 51011/510120.00 to 9.99

0.0 to 99.90.0 to 99.90 to 999 0 to 999

00 to 9,990 00 to 9,990

000 to 99,900 000 to 99,900

0,000 to 999,000 0,000 to 999,000

The small zeros in the table are fixed (theyareforindicatingdigits).

Setting the Range1. PressRANGE. The range is set to manual range mode and is

fixed at the current range. [R-H]appears.2. PressRANGEtosettherangeyouwant.Therangeincreases

eachtimeyoupressthekey.Pressingthekeyatthemaximumrange causes the range to be set to the minimum range.

3. Toreturntoautorangemode,holddownRANGE for at least 1 second.[R-H]disappears.

NoteToviewtherangeduringmeasurement,coverthelight-detectingsurfacewiththecapsothattheilluminanceiszero.

IM 51011-01EN 25

7. Average Illuminance (AVG Key)This function is available on Model 51021.The average illuminance can be calculated using the 4-point or 5-point method.(Seechapter3,“NormalIlluminanceMeasurement.”)The meter can save the measured values of up to five measurement points.When the measurement of all the points is complete, the meter calculates the average illuminance and displays the result.

Measuring1. PressAVG.[AVGMEMO-]appears.2. Inaccordancewiththedescriptioninchapter22,“Illuminance

MeasurementMethod,”measuretheilluminanceoflocation1, and press 1. The measured value is stored.

Location number: 1 2 3 4 (4-pointmethod) 1 2 3 4 C (5-pointmethod)3. Repeat step 2 at each of the locations. Forthe5-pointmethod,measuretheilluminanceatthecenter

oftheroom(medianpoint),andpress C. (Youcanmeasurethelocationsinanyorder.) Thedisplayshowsthenumbersofthelocationsinwhichvalues

arestoredafter[AVGMEMO-]. Ifyoupressanumberkeyforalocationinwhichavalueis

stored,thevaluewillbeoverwritten. Ifyouholddownanumberkeyforalocationinwhichavalue

is stored for more than 1 second, the value is deleted, and the location number disappears from the display.

IM 51011-01EN26

4. After storing the measured values for all locations, press AVG. [AVG]appears,andthecalculatedresult(averageilluminance)

is displayed. If you press AVG again,[AVGMEMO-]appears,andyouwill

beabletooverwriteordeletemeasuredvalues.5. Toreturntothenormalilluminancemeasurement,holddown

AVG for at least 1 second. Allthestoredvalueswillbedeleted.

Note• Torepeataverageilluminancemeasurements,werecommendthat

you return to normal illuminance measurement once or delete all stored data before making the next measurement.

• Toviewthevalueofalocationwhilethemeasuredresultis displayed,holddownthenumberforthelocation.

IM 51011-01EN 27

8. Deviation Display (Δ/% Key)You can display measurement deviation. Setareferenceilluminance,andthemeterwilldisplaythe deviation based on the reference. Therearetwodisplaymodes.

Deviation value display Δ=measuredvalue–referencevalue

Percentage display %=(deviation/referencevalue)×100

Measuring1. Measure the reference illuminance, and then press Δ/%.

The measured value is stored as the reference value. [Δ,R-H]appears,andthemeasurementrangeisfixed.

Measured values are displayed as deviation values.2. PressΔ/% to change to the percentage display. [%]appears. Thedisplayswitchesbetweendeviationvaluedisplayand

percentage display each time you press Δ/%.3. Toviewthereferencevalue,holddownCALL.4. Toreturntothenormalmeasurementdisplay,holddownΔ/%

for at least 1 second.

NoteIfthemeasuredvaluefallsoutsidethemeasurementrange,[OL]will appear.

IM 51011-01EN28

9. Light Source Luminous Intensity (cd Key)This function is available on Model 51021.If the light source can be regarded as a single, single-point light source, you can set the distance from the light source to the measuring point and make the meter calculate and display the luminous intensity. Luminousintensity(cd)=illuminance(lx)×distance(m)2

Setthedistancetothemeasuringlightsourceinadvance.

Setting the Distance1. PressSET and then cd.[SET,m]appears.2. Press and to enter the distance from the light source under

measurement to the reference plane of the lux meter. Therangeis00.00to99.99m.(Inunitofmeter)

3. PressSET. [SET,m]disappears,andthesettingiscomplete.

Measuring1. Presscd.[cd]appears.2. Facethelight-detectingsurfaceoftheluxmetertowardsthe

light source. Take a measurement at the specified distance. Toviewthedistancethatyouhavespecified,holddownCALL.3. Read the value.4. To return to normal measurement, press cd.[cd]disappears.

IM 51011-01EN 29

10. Totalized Intensity of Illumination (ACC Key)

This function is available on Model 51021.The meter calculates the totalized intensity of illumination and integral time.The maximum totalized intensity of illumination is 9990000000 lx h (threesignificantdigits),andthemaximumintegralvalueis 10000h.(Inunitofhours)If the comparator function is enabled and the totalized intensity of illumination reaches a preset value, totalization stops at this pointandthedisplayisheld.Youcanreadtheintegraltimewhen totalization stopped. To use the comparator function, set the limit value.

NoteIfthebatteryrunslowduringlong-termtotalization,anerrormaybe introducedinthecalculation.Toperformlong-termtotalization,werecommendthatyousupplypowerthroughUSB.

IM 51011-01EN30

Setting the Limit Value (Only When Using the Comparator)The maximum number of digits available is 12. Ofthesedigits,3digitsaresignificant,andtherestareplace holders(fixedat0;including2decimaldigits).Avalueisenteredintwoparts:thetop5digitsandtheremaining 7digits.1. PressSET and then ACC. [SET,lxh]appears.2. First,enterthetop5digits. Use and to enter the digits one by one. After entering the 5 digits, press toswitchthedisplayto

enter the remaining digits. Use and to set the limit value.

Exampleofhowtoset1230000

Display for setting the top digits

Display for setting the remaining (lowest) digits

3. After entering the value, press SET. [SET]disappears,andthesettingiscomplete.

IM 51011-01EN 31

Measuring1. PressACC. Totalizationstarts,and[lxh]appears. Theautomaticpower-offfunctionisdisabled,and

[AUTOPOWEROFF]disappears. To use the comparator function, press COMP. [COMP,Go]appears.Goindicatesthattotalizationisin

progress.2. Thedisplayswitchesbetweenintegraltimedisplayand

totalized value display each time you press ACC. [h]appearswhentheintegraltimeisdisplayed.3. To pause totalization, press HOLD. [D-H]appears,andtheintegrationofilluminanceandtimeis

paused. To resume totalization, press HOLD again. If the comparator function is in use and the totalized value

exceedsthelimitvalue,[D-H,Hi]appearsandtotalizationstops. (Theintegraltimeisdisplayed.)

4. Toviewthelimitvalue,holddownCALL. Ifthespecifiednumberofdigitsisgreaterthan7,

the top and bottom digits are displayed alternately.5. To return to the normal illuminance measurement,

holddownACC for at least 1 second.

NoteIf the totalized intensity of illumination or integral time reaches its maximumvalue,totalizationstops.[D-H]appears.

IM 51011-01EN32

11. Comparator (COMP Key)This function is available on Model 51021.Thecomparatorfunctiondetermineswhetherthemeasuredvalue (displayedvalue)iswithinthespecifiedrange,greaterthanthe highlimit,orlessthanthelowlimit.Setthelowlimit(Lo)andhighlimit(Hi)todefinethereference range.Themaximumnumberofdigitsavailableis8. Ofthesedigits,3digitsaresignificant,andtherestareplace holders(fixedat0;including2decimaldigits).The meter displays the comparison result.

Display ConditionHi highlimit(Hi)<measuredvalue

Go lowlimit(Lo)≤measuredvalue≤highlimit(Hi)

Lo measuredvalue<lowlimit(Lo)

Setting the Comparator (Change)1. PressSET and then COMP. [SETCOMPLo]appears.Loindicatesthelowlimit.2. Setthelowlimit.Thetopdigitisdisplayed,

so use to set the number. Press .Settheremainingdigits. Use and to enter the digits one by one.

Exampleofhowtoset1230

Display for setting the top digit

Display for setting the remaining (lowest) digits

3. PressCOMP. The display for setting the high limit appears. Setthehighlimitinthesamemannerasinstep2. (PressCOMPtoswitchbetweenhighandlowlimits.)4. After entering the values, press SET. The setting is complete,

and[SET]disappears.

IM 51011-01EN 33

Measuring1. While normal illuminance measurement or color correction

measurement is in progress, press COMP. The comparator functionisenabled,and[COMP,Lo],[COMP,Hi],or [COMP,Go]isdisplayed.Theautomaticpower-offfunctionis disabled,and[AUTOPOWEROFF]disappears.

2. Toviewthehighandlowlimits,holddownCALL. Thehighandlowlimitsaredisplayedalternatelyat1.5 second intervals.

3. To return to the normal illuminance measurement, holddownCOMP for at least 1 second.

[COMP,Lo],[COMP,Hi],or[COMP,Go]disappears.

12. Ripple Measurement (S-F Key)This function is available on Model 51021.The ripple measurement function facilitates the measurement of indoor fluorescent lamps during the daytime.Whentheilluminanceoffluorescentlampsismeasuredwithalux meter during the daytime, the sunlight influence is large.A typical method to overcome this phenomenon is to measure thefluorescentlampswiththesunlightfirst,measurethesunlight withoutthefluorescentlamps(ambientlightonly)second,and takethedifference.However,thismethodrequiresyoutoturnon andoffthelampsateachmeasurementpoint,waitforthelamps to stabilize each time they are turned on, and so forth. Inotherwords,thismethodtakestroubleandtime.Another method is to measure all the measurement points first withthefluorescentlampsturnedon,thenmeasurethesame pointswiththelampsturnedoffsecond,andthentakethe differences. This method is disadvantageous in that taking measurementsatthesamelocationandheightwhenthelamps areturnedonandwhentheyareturnedoffisdifficult,which results in errors.

IM 51011-01EN34

Measurement PrincipleTheluxmetercancalculatetheilluminancebyusingtheAC component characteristics of the radiation of fluorescent lamps illuminatingatthecommercialpowerfrequency. TheACcomponentisrelatedtotheDCcomponent (averagevalue)ataconstantratio(rippleratio).Therelationshipbetweentherippleratioandilluminanceisshown below.

Ripple ratio =DC component (Ld)AC component (Lr)

– Ambient light (Lg)

AC component (Lr)=

Total illuminanceof the room

Florescent lamp waveform

DC component (average) Ld

Total illuminance of the room

Ambient light Lg

AC component (ripple) Lr

Thus,theilluminance(DCcomponentLd)canbedetermined withthefollowingequation.

Illuminance=DCcomponent(Lr)×Rippleratio

The ripple ratio must be determined in advance through the measurement of the total illuminance of the room and ambient light Lg.TheluxmetercanusetherippleratioandACcomponent measurements to calculate illuminance.

IM 51011-01EN 35

Setting the Ripple RatioThe ripple ratio must be set prior to ripple measurements.Aslongastheconditionsremainthesame(sametypeof fluorescentlamp),youdonothavetoresettherippleratio.Fluorescentlampsareunstableimmediatelyaftertheyareturned on.Settherippleratioafteratleast30minuteselapsesafterthe lamps are turned on.Selectalocationintheroomwherethereislittleambientlightand alsodirectlybelowthefluorescentlamps.Never move the lux meter during this procedure.1. Facethelight-detectingsurfaceoftheluxmetertothe

fluorescent lamps to be measured, and then press SET and then S-F.Thetotalilluminancewillbemeasured.

Afterabout5seconds,[-------]appears.2. When[L-OFF]appears,turnoffthefluorescentlamps.3. PressSET.Theambientlightwillbemeasured. Afterabout3seconds,[-------]appears.Whentheripple

ratio is set properly, the meter returns to normal illuminance measurement.

If“Err”appears,therippleratioisnotset. If this occurs, press SET to return to normal illuminance

measurement, change the location, and try again. Anerrorwilloccurinthefollowingcircumstances. •Iftheilluminanceofambientlightisgreaterthanorequalto

thatofthefluorescentlamps:Err.3 •IftheACcomponentisextremelysmallorlargecomparedto

the illuminance to be calculated: Err. 0

Thesetrippleratioisretainedevenwhenthepoweristurned off(theratioisretaineduntilitischanged).

Ripple Measurement1. PressS-F.[S-F]appears,andmeasurementstarts. Toviewtherippleratio,holddownCALL.2. To return to normal measurement, press S-F.[S-F]disappears.

IM 51011-01EN36

13. Communication Functions13.1 Cable Connection and Interface SpecificationsYoucanconfiguretheluxmeterfromaPCandviewsettings andmeasuredvaluesthroughUSBcommunications (serialcommunicationviaavirtualCOMport).

Installing the USB DriverToconnecttheluxmetertoaPC,youmustfirstinstall theappropriateUSBdriver.

USBspecifications:Conformstoversion1.1

DownloadthedriverfromtheYOKOGAWA’sluxmeterwebsite.

http://tmi.yokogawa.com/products/portable-and-bench- instruments/luxmeters/digital-lux-meters/

Communication settings Baudrate: 9600bps Parity: None Stopbits: 2bits Datalength: 8bits Handshaking: None Receiveddelimiter: CrLf,Lf,0x03 (anyoftheaboveisacceptable) Transmitteddelimiter:CrLf,Lf,0x03(default:CrLf) (selectedwithacommand)

IM 51011-01EN 37

13.2 List of Commands

Command Description

HDSetswhethertoincludeaheaderinmeasureddatasentfromtheluxmetertothePC

ICEnables or disables the comparator during the measurement of totalized intensity of illumination

IL Reads the totalized intensity of illumination and time

ISStartsandstopsthemeasurementofthetotalizedintensity of illumination

KC Selectstheuserareanumberofthecolorcorrectionfactor

KS Enables the color correction factor

LD SelectshowtosenddatafromtheluxmetertothePC

PO Enablesautomaticpower-off

RA Setsautorangemode

RD Requests to send measured data

RH Setstherangeholdfunction

RS Checksunsent(measured)datainbuffer

TM Setsthetransmitteddelimiter

IM 51011-01EN38

13.3 Detailed Description of Commands

Com mand

51011 51012 51021 Description

HD Yes Yes SetswhethertoincludeaheaderinmeasureddatasentfromtheluxmetertothePCSetwhethertoincludeaheader:HDm<delimiter>

m=0:noheader,1:withheader(default)

→Response:0<delimiter>

IC - Yes Enables or disables the comparator during the measurement of totalized intensity of illuminationUsethecomparator:IC,m<delimiter>

m=0:OFF,1:ON

Note: This applies only during the measurement of totalized intensity of illumination.

→Response:IC,m<delimiter>m=0:successful,1:error

IL - Yes Reads the totalized intensity of illumination and timeRead the totalized intensity of illumination and time:

IL<delimiter>

→Response:IL,mmmEsn,ttttt.t<delimiter>m=mantissaoftotalizedvalue: 3digits(000to999)sn=exponentoftotalizedvalue:-2to+3t=integraltime:00000.0to10000.0h

IS - Yes Startsandstopsthemeasurementofthetotalizedintensity of illuminationStarttotalizedintensityofillumination:IS,m<delimiter>

m=0:OFF,1:ON

→Response:IS,m<delimiter>m=0:successful,1:error

IM 51011-01EN 39

KC - Yes SelectstheuserareanumberofthecolorcorrectionfactorSelecttheuserarea:KC,mm<delimiter>

m=01to20

→Response:KC,m<delimiter>m=0:successful,1:error

KS - Yes Enables the color correction factorUsethecolorcorrectionfactor:KS,m<delimiter>

m=0:OFF,1:ON

→Response:KS,m<delimiter>m=0:successful,1:error

LD Yes Yes SelectshowtosenddatafromtheluxmetertothePCSelecthowtosend:LD,m<delimiter>

m=0:everymeasurement1:everydatarequest(RD)command(default)

→Response:LD,n<delimiter>n=0:commandsuccessful,1:commanderror

PO Yes Yes Enablesautomaticpower-offEnableautomaticpower-offPO,m<delimiter>

m=0:disableautomaticpower-off1:enableautomaticpower-off

Note: Ifthiscommandisreceivedwhiletotalizedintensity of illumination or comparator measurement is in progress,thecommandwillbeexecutedafterthe meter returns to normal measurement.

→Response:PO,m<delimiter>m=0:successful,1:error

IM 51011-01EN40

RA Yes Yes SetsautorangemodeSetautorangemode:RA<delimiter>

→Response:RA,m<delimiter>m=0:successful,1:error

RD Yes Yes Requests to send measured dataRequesttosend:RD<delimiter>

→Response:RD,m<delimiter>m=0:commandsuccessful,1:commanderror

RH Yes Yes SetstherangeholdfunctionSetrangehold:RH,m<delimiter>

m=0:9.99,*1:99.9,2:999,3:9,990,4:99,900,5:999,000

*:Model51021only

→Response:RH,m<delimiter>m=0:successful,1:error

RS Yes Yes Checksunsent(measured)datainbufferCheck:RS<delimiter>

→Response:RS,m,n<delimiter>m=0:commandsuccessful,1:commanderrorn=0:nounsentdata,1:unsentdataavailable

TM Yes Yes SetsthetransmitteddelimiterSetthedelimiter:TM,m<delimiter>

m=0:CRLF(default)1:LF2:0x03

→Response:0<delimiterthatwassetbeforethe TM commandwasreceived>

IM 51011-01EN 41

14. Recorder Output (Analog Output)You can connect the lux meter to a recorder or oscilloscope and use the recorder output function to record illuminance trends or observelightsourcewaveforms.

Output Signal Specifications 999mV±5% (rangefixedforfullscaleofeachrange) Loadresistance:100kΩormore

1. Prepareacoatedsingle-coreshieldedwire,andsolderitto the recorder accessory output plug.

Connecttheotherendofthewiretotheinputofthemonitoring instrument.

Shielded wire

Plug cover

Soldered on the – side

Soldered on the + side

2. Attach the cap, turn on the lux meter, and insert the plug into the recorder output connector.

[REC,R-H]appears,andtherangeisfixed(manualrange mode).

Theautomaticpower-offfunctionisdisabled,and [AUTOPOWEROFF]disappears.

3. SettheRESPONSEswitchtoFAST.4. 1mVofoutputvoltagecorrespondstoavalueof1intheleast

significant digit of the three significant digits. Settheappropriaterange. Fordetailsonsettingtherange,seechapter6,“RangeHold”.5. Coverthelight-detectingsurfacewiththecap,andadjustthe

zero level of the monitoring instrument. Remove the cap and start measuring.

IM 51011-01EN42

15. Separating the Light DetectorYou can separate the light detector from the main unit for use. Usethededicatedlightdetectorextensioncable(soldseparately).1. Turnoffthepower.2. Pressthe eject button to release the lock, and separate the

light detector from the main unit.3. Inserttheextensioncableconnector(theendwiththeejectpin)

to the main unit, and check that it is locked in place.4. Connecttheotherend(theendwiththeLogo)tothelight

detector, and check that it is locked in place.5. Turnonthepower,andstartmeasuring.

(Todisconnecttheextensioncable,presstheejectbuttonto releasethelockfirst.)

Extension cableeject button

Main uniteject button

Eject pin

Logo USBport

Light detector

Main unit

Extension cable

16. Supplying Power through USBYoucansupplypowerthroughUSB(5VDC±5%)fromexternal byconnectingaoff-the-shelfUSBcable(miniBtype)totheUSBport of the lux meter.

NoteYoucansupplypowerthroughUSBevenwhenbatteriesareinstalled.

IM 51011-01EN 43

17. After-Sales Service

17.1 Error MessagesErrorswhensettingtherippleratio Err.0,Err.3(seechapter12,“RippleMeasurement”)

Ifanyofthefollowingerrorsoccur,repairmaybenecessary. Err. 1: Light detector error Err. 2: Offset error Err. 4: Main unit memory error

Iftheerrorpersistsevenaftercheckingthefollowingitems,repair is necessary.• Isthelightdetectorsecurelyconnectedtothemainunit

(istheejectpinlockedcorrectly)?• Wasthecapattachedproperlyduringzeroadjustment?• Wasthecapbrokenduringzeroadjustment?• Isthebattery(voltage)appropriate?

(DoesErr:2occurevenwhenthebatteriesarereplacedwith newones?)

17.2 Calibration

If repair or calibration is necessary, contact your nearest YOKOGAWA dealer.

IM 51011-01EN44

18. Disposing the Product18.1 Disposing the ProductWaste Electrical and Electronic Equipment (WEEE), DIRECTIVE 2002/96/EC(ThisdirectiveisvalidonlyintheEU.)

ThisproductcomplieswiththeWEEEDirective (2002/96/EC)markingrequirement.Thismarking indicates that you must not discard this electrical/ electronicproductindomestichouseholdwaste.

ProductCategoryWith reference to the equipment types in the WEEE directive AnnexI,thisproductisclassifiedasa“Monitoringandcontrol instruments”product. WhendisposingproductsintheEU,contactyourlocalYokogawa EuropeB.V.office.Donotdisposeindomestichouseholdwaste.

18.2 Replacing and Disposing BatteriesNew EU Battery Directive, DIRECTIVE 2006/66/EC(ThisdirectiveisvalidonlyintheEU.)

Batteriesareincludedinthisproduct. When you remove batteries from this product and

disposethem,discardtheminaccordancewithdomestic lawconcerningdisposal.

Take the proper action to dispose batteries in accordance withtheestablishedcollectionsystemintheEU.

Batterytype:AlkalinedrycellNotice:This marking indicates they shall be sorted out and collected as ordainedinANNEXIIinDIRECTIVE2006/66/EC.Howtoremovebatteriessafely:Seesection2.4,“CheckingandReplacingBatteries.”

IM 51011-01EN 45

19. Specifications51011Class: ConformstoClassAinJISC1609-1:2006Measurement ranges: 0.0 to 99.9/999/9,990/99,900/999,000 lx (automaticandmanualrangemodeswitching)Accuracy(linearity): at23°C±2°C Readingof3000lxorless: ±4%ofreading±1 (leastsignificantdigit) Readinggreaterthan3000lx: ±6%ofreading±1 (leastsignificantdigit)Response time: 5 sec. or less in auto range mode 2 sec. or less in manual range modeCharacteristicsofobliqueincidentlight: (Deviationfromthecosinelaw) Angle 10°±1.5% 30°±3% 60°±10% 80°±30%Characteristicsofrelativevisible-spectrumresponse: Deviation from the standard spectrum luminous efficiency f1’: within9%Fatiguecharacteristics: ±2%Temperature characteristics: ±5%(at23°Creferenceandarangeof–10to40°C)Humiditycharacteristics: ±3%

IM 51011-01EN46

51012Class: ConformstoClassAAinJISC1609-1:2006Measurement ranges: 0.0 to 99.9/999/9,990/99,900/999,000 lx (automaticandmanualrangemodeswitching)Accuracy(linearity): at23°C±2°C Readingof3000lxorless: ±2%ofreading±1 (leastsignificantdigit) Readinggreaterthan3000lx: ±3%ofreading±1 (leastsignificantdigit)Response time: 5 sec. or less in auto range mode 2 sec. or less in manual range modeCharacteristicsofobliqueincidentlight: (Deviationfromthecosinelaw) Angle 10°±1% 30°±2% 50°±6% 60°±7% 80°±25%Characteristicsofrelativevisible-spectrumresponse: Deviation from the standard spectrum luminous efficiency f1’: within6%Fatiguecharacteristics: ±1%Temperature characteristics: ±3%(at23°Creferenceandarangeof–10to40°C)Humiditycharacteristics: ±3%

IM 51011-01EN 47

51021Class: ConformstoClassAAinJISC1609-1:2006Measurement ranges: 0.00 to 9.99/99.9/999/9,990/99,900/999,000 lx (automaticandmanualrangemodeswitching)Accuracy(linearity): at23°C±2°C Readingof3000lxorless: ±2%ofreading±1 (leastsignificantdigit) Readinggreaterthan3000lx: ±3%ofreading±1 (leastsignificantdigit)Response time: 5 sec. or less in auto range mode 2 sec. or less in manual range modeCharacteristicsofobliqueincidentlight: (Deviationfromthecosinelaw) Angle 10°±1% 30°±2% 50°±6% 60°±7% 80°±25%Characteristicsofrelativevisible-spectrumresponse: Deviation from the standard spectrum luminous efficiency f1’: within6%Fatiguecharacteristics: ±1%Temperature characteristics: ±3%(at23°Creferenceandarangeof–10to40°C)Humiditycharacteristics: ±3%Ripple measurement: Illuminance measurement of fluorescent lamps (exceptforhigh-frequencylighting)inthedaytime Measuringrange:100to3000lx Accuracy:at23°C±2°C ±7%ofreading±1(leastsignificantdigit)

IM 51011-01EN48

Common Specifications for 51011, 51012, and 51021Photoelectricelement:SiliconphotodiodeDisplay: 7-digitliquidcrystaldisplay(LCD) withfunctionandunitdisplays Maximum effective display (forilluminancemeasurement): 999+0’sforplaceholders Overrangedisplay:[OL] Lowbatteryvoltagedisplay:[ ]Measurementcycle: TwicepersecondRecorder output: 1V±5%(rangefixedforfullscaleofeachrange) Loadresistance:100kΩormoreAutomaticpower-off: Disabled for totalized measurement and comparator measurementandwhentherecorderoutputplugis insertedapprox.30minutesafterthelastkeyactivity. Canbeextendedordisabled.Operating temperature and humidity: –10°Cto40°C,80%RHorless(nocondensation)Storagetemperatureandhumidity: –25°Cto70°C,5to95%RH(nocondensation)Measurementcycle: Twicepersecond

IM 51011-01EN 49

Safetystandards: EN61010-1CAT.I Pollutiondegree2,Indooruse, Altitude 2000 m or lessEMCstanderds: EN61326-1ClassB, EN55011ClassBGroup1 KoreaElectromagneticConformityStandard

한국 전자파적합성기준

Influence in the immunity environment ±10%orlessofrange (Recorderoutput:±15%orlessofrange) Cablecondition: UseaUSBcablethatis3morlessinlength.Powersupply: TwoAAdrycellsor

powersupplythroughUSBBatterylife: Approx.40h(whenusingalkalinedrycells)Inputrating: Battery:3VDC(0.3W) USB:5VDC±5%(0.5W)Dimensions: Approx.67(W)×177(H)×38(D)mmWeight: Approx.260g

USBport: miniBtype

IM 51011-01EN50

20. Characteristics of Relative Visible- spectrum Response

The visible spectrum of light for human beings is from approximately360nmto830nm.Evenwithinthisnarrowrange, thesensitivitytolightvariesgreatlydependingonthewavelength. This phenomenon is called the standard spectral luminous efficiencyandisindicatedbyV(λ).The characteristics of relative visible-spectrum response of lux meters play an important role in illuminance measurement. It is important to approximate the relative visible-spectrum responsetoV(λ).These characteristics are stipulated in engineering standards (JISC1609-2)forcertifiedluxmetersandJISC1609-1. TherelativespectralresponseofanilluminancemeterS(λ)is measuredat5-nmintervalsfor95wavelengthstocalculatethe deviation(f1’)fromV(λ). This method of evaluation is based on the performance evaluationoftheCommissionInternationaledel’Eclairage (InternationalCommissiononIllumination;CIE).Therearevariouslightsourcessuchaswhitelight,fluorescent lamps, and mercury lamps on the market.Normally, the relative spectral response of a lux meter is slightly offfromV(λ).Sowhenalightsourcewithadifferentspectral distributionthanthesourcethatwasusedtocalibratethelux meterismeasured,thereadingswillbeslightlyoff.

IM 51011-01EN 51

The color correction factor is used to correct this error. To make accuratemeasurements,werecommendthatyoucorrectthereadings by multiplying the color correction factor of the light source under measurement.Thefollowingfigureshowsthecharacteristicsoftherelativespectral response.

0.8

1.0

0.6

0.4

0.2

0.0350 400 450 500 550 600 650 700 750 800 850

Wavelength (nm)

Rel

ativ

e sp

ectra

l res

pons

e

Standard spectral luminous efficiency

Relative spectral response

IM 51011-01EN52

21. Characteristic of Oblique Incident LightWhenreadingabookatnight,thebrightnessdiffersbetween reading under a light and reading a little farther from the light.Insuchacase,youprobablynoticedthatthebookwaseasierto readwhenyoufacedthebooktowardthelight.Iftheanglebetweentheincidentlightandthelineperpendicular totheilluminatedsurfaceisdefinedtobeθ,theilluminanceof thesurfaceisproportionaltocosθ.This characteristic is standardized.If the lux meter does not meet the standard, illuminance of oblique incident light cannot be measured accurately.Thefollowingfigureshowsthecharacteristicofoblique incident light.

–80 –70 –60 –50 –40 –30 –20 –10 0 10 20 807060504030Angle of oblique incidence (°)

(%)

–30

–20

–10

0

10

20 Tolerance for Class AA

30

Rel

ativ

e ill

umin

ance

IM 51011-01EN 53

22. Illuminance Measurement Method (Extract from the JIS C 7612 standard)Forgenerallighting,illuminanceofahorizontalsurfaceistypically measured and averaged.Unlessotherwisespecified,theheightofthemeasuredsurface shallbewithin85cmfromthefloor,40cmfromthetatamifloor inthecaseofaJapanese-styleroom,orthesurfaceofthefloor orgroundinthecaseofacorridororinoutdoors(ifitisdifficultto measure the illuminance on the floor or ground, the height shall be within15cmfromthefloororground).The location for measurement shall be divided into equal areas by vertical and horizontal partitioning lines, and the average illuminance for each area shall be calculated. The calculated average of the areas shall be the average illuminance of the total area measured.Therearetwomethodstodeterminetheaverageilluminancefor each area: the 5-point method and 4-point method.

(JIS:JapaneseIndustrialStandards)

5-point methodThemiddleofeachside(thempoint)andthecenterofgravity (thegpoint)shallbemeasuredtoobtainilluminancesEmand Eg, and then the average illuminance for each area shall be determinedaccordingtothefollowingexpression:

E0= (Em1+Em2+Em3+Em4+2Eg) = (∑Em+2Eg)16

16 m4

m3

m2

m1 g

IM 51011-01EN54

4-point methodThe4-pointmethodisusedwhenthevariationintheilluminance issmall.Thefourcorners(theipoints)shallbemeasuredto obtain illuminance Ei, and then the average illuminance for each areashallbedeterminedaccordingtothefollowingexpression:

E0= (Ei1+Ei2+Ei3+Ei4)= ∑Ei

14

14

i2 i3

i4i1

If you use Model 51021, measurements using the 4-point and 5-point methods are easy. (Seechapter7,“AverageIlluminance.”)Thereisanothermethodinwhichtheaverageilluminanceof multiple partitioned areas can be determined directly.Fordetails,seeJISC7612.

IM 51011-01EN 55

23. "Measure for Administration of the Pollution Control of Electronic Information Product" of China

Thefollowingaretheprovisionsof"MeasureforAdminisrationofthePollution ControlofElectronicInformationProduct"ofChina. TheyareapplicableonlyinChina.

产品中有毒有害物质或元素的名称及含量

部件名称

有毒有害物质或元素

铅

（Pb）

汞

（Hg）

镉

（Cd）

六价铬

（Cr (VI)）

多溴联苯

（PBB）

多溴二苯醚

（PBDE）

框架（塑料） × × × × ○ ○

线路板 ASSY × × × × ○ ○

电池 × × × × ○ ○

Plug JC017 × × × × ○ ○

○：表示该部件的所有均质材料中的有毒有害物质的含量均在 SJ/T 11363-2006

标准中所规定的限量以下。

×： 表示该部件中至少有一种均质材料中的有毒有害物质或元素的含量超过

SJ/T 11363-2006 标准所规定的限量要求。

<选购 >

91001, 91002

框架（塑料） × × × × ○ ○

线路板 ASSY × × × × ○ ○

CABLE × × × × ○ ○

环保使用期限 :

该标识适用于 2006 年 2 月 28 日颁布的《电子信息产品污染控制管理办法》以及

SJ/T 11364–2006《电子信息产品污染控制标识要求》中所述、在中华人民共和国

销售的电子信息产品的环保使用期限。

只要您遵守该产品相关的安全及使用注 意事项、在自制造日起算的年限内、

则不会因产品中有害物质泄漏或突发变异、而造成对环境的污染或对人体及

财产产生恶劣影响。

注）该年数为“环保使用期限”、并非产品的质量保证期。零件更换的推荐周期、

请参照使用说明书。