Extech Instruments 407780A User manual

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
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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
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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
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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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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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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
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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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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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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.
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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
10
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.
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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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