Extech Instruments 407780A Manuel utilisateur

USERGUIDE

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IntegratingSoundLevelMeter

andDatalogger

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Model407780A

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407780A‐EU‐ENv1.34/14

Introduction

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ThankyouforselectingtheExtechInstrumentsModel407780A.Thisdevice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.

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Features

TheSoundLevelMetercomplieswiththerequirementsofIEC61672‐1:2003standardfora

Class2instrument.

Theinstrumentcontainsseveralfeatureswhichpermitsoundlevelmeasurementsundera

varietyofconditions.

Featuresinclude:

Fivemeasurementranges

Fast,SlowandImpulsetimeweightingsettings

AandCfrequencyweightingsettings

Storageofupto32000measurementrecords

USBserialportfordownloadingrecordstoacomputerorrealtimeanalysis

AC/DCsignaloutputsareavailablefromasinglestandard3.5mmcoaxialsocketsuitable

forusewithafrequencyanalyzer,levelrecorder,FFTanalyzer,graphicrecorder,etc.

Leq,SEL,SPLMAX,SPLMIN,PH(PeakHold),L05,L10,L50,L90,andL95,tenmeasured

parametersaremonitoredduringmeasurement

Presetmeasurementtime

Soundlevelalarmoutputconnector

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407780A‐EU‐ENv1.34/14

InstrumentCare

Donotattempttoremovethemeshcoverfromthemicrophoneasthiswillcause

damageandaffecttheaccuracyoftheinstrument.

Protecttheinstrumentfromimpact.Donotdropitorsubjectittoroughhandling.

Transportitinthesuppliedcarryingcase.

Protecttheinstrumentfromwater,dust,extremetemperatures,highhumidityand

directsunlightduringstorageanduse.

Protecttheinstrumentfromairwithhighsaltorsulphurcontent,gasesandstored

chemicals,asthismaydamagethedelicatemicrophoneandsensitiveelectronics.

Alwaysswitchtheinstrumentoffafteruse.Removethebatteriesfromtheinstrumentif

itisnottobeusedforalongperiodoftime.Donotleaveexhaustedbatteriesinthe

instrument,astheymayleakandcausedamage.

Cleantheinstrumentonlybywipingitwithasoft,dryclothor,whennecessary,withacloth

lightlymoistenedwithwater.Donotusesolvents,abrasives,alcoholorcleaningagents.

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407780A‐EU‐ENv1.34/14

MeterDescription

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1. 1/2‐inchmicrophone

2. LCDdisplay

3. Powerbutton

4. Leq/SEL/SPLselectbutton

5. RUN/Pausebutton

6. UP/DOWNrangesettingbuttons.

7. A/CFrequencyweightingselectswitch

8. FAST/SLOW/IMPULSEtimeweighting

selectswitch.

FAST:125ms,SLOW:1second,

IMPULSE:35mswithslowdecay

9. MAXbutton

10. RECORD/ERASEbutton

11. Realtimeclockbutton

12. Integrationtimebutton

13. Alarmoutput

14. AC/DCoutput

15. CAL(calibration)adjustment

16. Externalpowerinput

USBinput(locatedonbottom,not

shown)

Tripodmountingscrew(locatedonrear,notshown)

Batterycover(locatedonrear,notshown)



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407780A‐EU‐ENv1.34/14

DisplayDescription

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1. Soundlevelrangeindicator(5ranges):30–90dB,40–100dB,50–110dB,60–120dBand70–

130dB

2. Bargraphrepresentsthecurrentsoundlevel(1dBresolution).

3. Date/timeandelapsedtimeindicator:year‐month‐dayorhour:minute:second.

Duringintegratingthisindicatordisplaystheelapsedtimeinseconds.

WhenviewingthePeakHoldvaluethisindicatordisplaysPH.

WhenviewingthepercentilevaluesthisindicatordisplaysL:05,L:10,L:50,L:90orL:95.

4. Leq:Equivalentcontinuoussoundlevelreading

5. SEL:Soundexposurelevelreading

6. SPL:Time‐weightedsoundlevelreadingSoundPressureLevel

7. Low‐batteryindication

8. MAX:WhendisplayedflashingitindicatesthattheMaximumtime‐weightedsoundlevel

readingisshown.WhenitisdisplayedsoliditindicatesthattheMaximumsoundlevel

readingisdisplayed.

9. MIN:Minimumsoundlevelreading.

10. REC:IndicatesthatDatarecordingisinprocess

11. Soundlevelreading(0.1dBresolution):30.0–130.0dB

12. FULL:Indicatesthattherecordingmemorybankhasbeenfilled

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407780A‐EU‐ENv1.34/14

13. dB:Soundlevelunit(decibel)

14. A,C:AorCfrequencyweightingindicator.

15. IMP:Impulsetimeweightingindicator

16. OVER:Over‐rangeindicatorappearsflashingwhenover‐rangemeasurementshavebeen

includedinthesoundlevelmeasurementdatarecordingsession.

17. SLOW:Slowtimeweightingindicator

18. FAST:Fasttimeweightingindicator

19. :Indicatesthatintegratingsoundlevelmeasurementshavebeenstopped.

20. :Indicatesthatintegratingsoundlevelmeasurementsarepaused.

21. :Startandcontinuousintegratingmeasurementindicator.

22. UNDER:Under‐rangeindicatorappearsflashingwhenunder‐rangemeasurementshave

beenincludedinthesoundlevelmeasurementdatarecordingsession.

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407780A‐EU‐ENv1.34/14

Operation

Themeterhastwomodesofoperation,SoundLevelMetermodeandIntegratingSoundLevel

Metermode.

SoundLevelMetermeasurements

1. Pressthe buttontoswitchthemeterON.Theinitialstatedependsontheconditionsset

whenthemeterwaslastswitchedoff.

2. PresstheA/Cbuttontoselectthedesiredfrequencyweighting.

3. PresstheFAST/SLOW/IMPULSEbuttontoselectthedesiredresponsetime.

Note:Refertolocalstandardstoselecttheproperweightingandresponsetimeforthe

measurementstobeperformed.Requirementsvaryaccordingtocountryandtypeoftest.

OSHArequiresSlowandAweightformanyoftheirworkplacetests.

4. Usethe▲▼buttonstoselectthedesireddBrange.Chooseasettinginwhichthebar

graphindicationregistersapproximatelyinthemiddleoftherange.IftheOVERindicator

appearsduringameasurement,theupperlimitoftheselectedrangehasbeenexceeded.

Increasetherangesettinguntilthesymbolremainsoffduringmeasurements.Similarly,if

theUNDERindicatorappears,reducetherangesettinguntilthesymbolremainsoff.Both

indicatorsarenon‐latchingandwillclearwhenthecorrectrangeisselected.

5. Holdtheinstrumentcomfortablyinhand(awayfromthebody)orpositionitonatripod.

Pointthemicrophonetowardthenoisesource,thesoundpressurelevelwillbedisplayed

onthemeter’sLCDdisplay

6. Thenumericlevelindicationonthedisplayshowsthecurrentlymeasuredsoundlevel.The

readingisupdatedoncepersecond.

7. PresstheMAXbuttontodisplaythemaximumsoundlevelencounteredduringa

measurementperiod;theMAXindicatorwillblinkappearonthedisplay.PresstheMAX

buttonagaintoexitthismode

8. PressDATE/TIMEtochangefromcurrenttimehour:minute:seconddisplaytocurrent

dateyear–month‐daydisplay.Thedisplaywillreverttothecurrenttimedisplayafter2

seconds.



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407780A‐EU‐ENv1.34/14

IntegratingSoundLevelMetermeasurements

Theintegratingsoundlevelmodewillmeasurethesoundlevelovertimeandcalculatethe

followingresults:

LeqEquivalentcontinuoussoundlevelmeasurement

SELSoundexposurelevelmeasurement

SPLMAXMaximumsoundlevelmeasurement

SPLMIN Minimumsoundlevel)measurement

(PH) PeakHoldsoundlevelmeasurement

Percentile Soundlevel(L05,L10,L50,L90andL95)measurement

Whenusingthismeterinamodeotherthanthesoundlevelmeasurementmode,allprocessing

functionsprovidedbythemeterareperformedsimultaneously.Forexample,whenequivalent

continuoussoundlevelmeasurementisselectedtheexposurelevelandpercentilelevelarealso

determined.

1. Pressthe buttontoswitchONthemeter.

2. PresstheA/Cbuttontoselectthedesiredfrequencyweighting.

3. PresstheFAST/SLOW/IMPULSEbuttontoselectthedesiredresponsetime.

4. Usethe▲▼buttonstoselectthedesireddBrange.Chooseasettinginwhichthebar

graphindicationregistersnearthemiddleoftherange.IftheOVERorUNDERindicators

switchONfrequently,changethelevelrangesetting.

5. Settingtheintegratingmeasurementtime.(DefaultorManual)

Defaulttimes:

a. PresstheINTEGTIMEbuttononcetoselectadefaultintegratingtime.

b. Usethe▼▲buttonstoselectthemeasurementtime.

c. Theselectionwillcyclethrough:1sec,3sec,10sec,30sec,1min,5min,8min,10min

15min,30min,1hour,8hours,24hours.

d. After5secondsofinactivitythemeterwillstorethedisplayedselectionandreturnto

thenormalmode.

Manuallysettime:

a. PressandholdINTEGTIMEfor3secondstomanuallysettheintegrationtime.

b. Aflashingcursorindicatesthecurrentlyselectedparameter(seconds).

c. Usethe▼▲buttonstosetdesiredsecond.

d. PresstheINTEGTIMEbuttontomovetothenextparameter(minutes),repeatthis

procedureuntilthedesiredminutesandhourshavebeenset.PresstheINTEGTIME

buttontostorethesettingandtoexitthismode.Themaximummeasurementtime

settingis100hours.

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407780A‐EU‐ENv1.34/14

6. Pressthe►ǁbuttontostartthemeasurement,the►symbolandtheelapsed

measurementtimeisdisplayed.

Whenthemeasurementtimehaselapsed,themeasurementautomaticallyterminates

andthesymbolisdisplayed.

Duringmeasurements,the►ǁbuttoncanbeusedtopauseandresumeatest.

Duringpause,thepausesymbolǁisdisplayed.

Toterminatethemeasurement,pressandholdthe►ǁbuttonfor2seconds.

Ifanunderoroverrangeconditionoccursatleastonceduringmeasurement,theOVER

orUNDERindicatorappearstoindicatethattherecordeddatacontainsover‐rangeor

under‐rangedata.

Duringthisproceduremostofthebuttons,suchastheA/Cbuttonandlevelrange

buttons,areinoperative.Onlythe►ǁbuttonandtheLeqSELSPLbuttonscanbeused.

Allothersettingsmustbemadebeforestartingthemeasurement.

Pauseintervalsarenotincludedinthemeasurementtime.



7. Whenthemeasurementiscompleted,pausedorinprogress,presstheLeqSELSPLbutton

tocyclethroughanddisplaythefollowingmeasurementresults.

Leq:Equivalentcontinuoussoundlevelwithstartmeasurementtime.

SEL:Soundexposurelevelwithterminatemeasurementtime.

SPLMAX:Maximumsoundlevelwithtime.

SPLMIN:Minimumsoundlevelwithtime.

PH:PeakHoldsoundlevel

L:055%percentilesoundlevel

L:1010%percentilesoundlevel

L:5050%percentilesoundlevel

L:9090%percentilesoundlevel

L:9595%percentilesoundlevel

SPLINSTCurrentsoundlevelwithcurrenttime.

IfOVERisflashing,therecordeddatacontainsover‐rangemeasurements.

IfUNDERisflashing,therecordeddatacontainsunder‐rangemeasurements.

8. Pressandholdthe►ǁbuttonfor2secondstoexitthismeasurementmode,clearthe

measuredresult,andtoreturntothenormalsoundlevelmeasurementmode.



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407780A‐EU‐ENv1.34/14

SettingtheCurrentTimeandDate

Dateandtimeinformationisstoredwitheachstoredrecordblock.Therefore,itisimportantto

ensurethatthisinformationiscorrect.

1. PresstoswitchOFFthemeter.

2. PressandholdtheDATETIMEbuttonandthenpressthe buttontoswitchONthemeter

toenterthedateandtimesettingmode.

3. Aflashingcursorindicatesthecurrentlyselectedparameter(seconds),usethe▲▼buttons

tosetthecurrentsecond.

4. PresstheDATETIMEbuttontomovetothenextparameter(minutes)andusethe

▲▼buttonstosetthecurrentminute.

5. Repeatstep4tosetthecurrenthour,day,month,andyear.

6. PressDATETIMEtostorethenewdateandtime,andtoexitthismode.



RecordingData

IntheIntegratingSoundLevelMetermodethemetercanrecordandstoremeasurementdata.

Memorycapacityis32000recordswhichcanbestoredinupto255blocks.Recordingcanstart

whenintegrationbeginsoratapresettime.Thestoreddatacannotbeviewedonthemeter’s

display;itmustbedownloadedusingthesuppliedPCsoftware.

1. Settingthedatasamplingrate.

a) Pressthe buttontoswitchOFFthemeter.

b) PressandholdtheINTEGTIMEbuttonandthenswitchthemeterON,theIntrsymbol

andthesamplerateinsecondswillbedisplayed.

c) Usethe▲▼buttonstosetthesamplingrate(1to255seconds).

d) PressINTEGTIMEtostorethesettingandexitthismode.

2. Settheintegratingfunctionsasdescribedpreviously.

3. PresstheRECORDERASEbuttontoprepareforrecording.TheRECsymbolwillappearonthe

display.

4. Pressthe►‖button.ThemeasurementswillstartandtheRECsymbolwillbegintoflash,

indicatingthatdataarebeingstored.

5. Ifintegrationispaused,recordingwillalsopause.

6. Whenthememoryisfilled(32000datapointsor255blocksused),theRECFULLsymbolwill

bedisplayed.



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