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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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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7. Tosettherecordingfunctiontostartatapresettime;
a) PressandholdtheDATETIMEbuttonfor2secondstoenterthePRESETrecording
start‐timesettingmode,thePrEsymbolwillbedisplayed.
b) Aflashingcursorindicatesthecurrentlyselectedparameter(seconds),usethe
▲▼buttonstosetthecurrentsecond.
c) PresstheDATETIMEbuttontomovetothenextparameter(minutes)anduse
the▲▼buttonstosetthecurrentminute.
d) Repeatstepc)tosetthecurrenthour,day,month,andyear.
e) PressDATETIMEtostorethestarttime,andtoexitthismode.
f) The►and ‖symbolswillflashuntilthestarttimehasbeenreached.The►and ‖
symbolswillthenstopflashingandtheRECsymbolwillbeginflashing,indicatingthat
themeasurementsarebeingtakenandthatrecordinghasstarted.

Clearingstoreddata
1. Pressthe buttontoswitchOFFthemeter.
2. PressandholdtheRECORDERASEbuttonandthenpressthebuttontoswitchONthe
meter.
3. TheCLrsymbolwillappearonthedisplayindicatingthatthedatahavebeenerased.

Analogoutputs
Theanalogoutputsprovideanalogsignalsproportionaltothemeasuredvaluesforrecorders
andotherdevices.Theoutputsrequirea3.5mmstereomini‐plug.
ACOutput:
AnACsignalcorrespondingtothefrequency‐weightedsignalisavailableatthisconnector.
Outputvoltage:2Vrms100mVrms(scaleupperlimit)
Outputimpedance:approx.5kΩ
Loadimpedance:≥1MΩ
Theoutputvoltagewhentheinstrumentisincalibrationmode(‐6dBfromscaleupperlimit,
1000Hzsinewave)is0.5Vrms.
DCOutput:
Alevel‐convertedDCsignalgeneratedbyRMSdetectionandlogarithmiccompressionis
availableatthisconnector.Thesignalreflectsthefrequencyandtimeweightingsettingsofthe
instrument.
Outputvoltage:10mV0.1mV/dB
Outputimpedance:approx.5kΩ
Loadimpedance:≥1MΩ
Theoutputvoltagewhentheinstrumentisreading94dBisnominally0.94VDC.



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Externalpowersource
InserttheplugofanACadaptororexternalbatterypackintotheDC6V(DCsourcefrom5Vto
6V)socketonthesideoftheinstrument.Whenaconnectorisinsertedintothissocket,the
internalbatterieswillbedisconnectedandtheinstrumentwillbepoweredfromtheexternal
source.Thelowbatterysymbol
willappearonthedisplayiftheexternalvoltageis
insufficientfortheinstrumenttoprovideaccuratemeasurements.

Note:Ensurethattheexternalpowersourceisconnectedwiththepolarityasindicatedinthe
followingdiagram;otherwisedamagemaybecausedtotheinstrumentandexternalpower
source.


Windscreen
Whenmakingmeasurementsinstrongwinds,windnoiseandstrongairmovementsatthe
microphonecancausemeasurementerrors.Sucheffectcanbereducedbyusingthe
windscreen.
TripodMounting
Forlong‐termmeasurements,theinstrumentmaybemountedonastandardcameratripod
usingtherearintegral¼”x20UNCmountingthread.
Alarmoutput
IfthemeasureddBlevelexceedsthesetlimit,theoverlimitsignalwillappearatthealarm
outputconnector(5Vdcoutput).Theoutputsignalwillremainactiveaslongasthesoundlevel
exceedsthesetlimit
Settingthesoundlevelalarmhighlimit:
1. SwitchthemeterOFF.
2. PressandholdtheLEQSELSPLbuttonwhileswitchingthemeterON.
3. ReleasetheLEQSELSPLbutton;theALARMsymbol(alongwiththecurrentlysetlimit)is
displayed.
4. Usethe▲▼buttonstosetthedesiredsoundlevelhighlimitvalue.
5. PressLEQSELSPLbuttontostorethesettingandtoexitthismode.

SoftwareInstallationandOperation
Forinstallationandoperatinginstructions,pleaserefertothecontentsofthesuppliedCD‐
ROM.

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Calibration
CalibratingtheIntegratingSoundLevelDataloggerrequiresanacousticalcalibratorsuchasthe
ExtechModel407766or407744.
1. Configurethemeterasfollows:
•Display:SPL(dBA)
•Timeweightingmode:FAST
2. Insertthemicrophoneintotheopeningoftheacousticalcalibrator.
3. SwitchthecalibratorON.
4. Adjustthemeter’scalibrationpotentiometerasshowninthe
accompanyingdiagramuntilthemeter’sdisplaymatchesthe
acousticalcalibratoroutputsignal(typically94or114dB).
5. SwitchthecalibratorOFF.
6. Removethecalibratorfromthemicrophoneveryslowlytoavoid
damagingthemicrophone.
7. Incaseswhereadjustingthepotentiometerdoesnotaffectthe
displayedreading,orwheretheadjustmentcannotproducethe
appropriatedisplayedreading,pleasereturntheunitforservice.

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Maintenance&Cleaning
Servicenotcoveredinthismanualshouldbeperformedbyqualifiedpersonnel
Periodicallywipethecasewithadrycloth.Donotuseabrasivesorsolvents.

BatteryInstallation
Whenthelowbatteryicon 
appearsonthedisplay,thereisinsufficientpowertomake
accuratemeasurementsandthebatteriesmustbereplaced.
1. Pressthebuttontoswitchofftheinstrument.
2. Loosenthescrewinthebatterycoverandremovethecoverfromthebattery
compartment.Retainthescrewandcover.
3. Observingcorrectpolarity,insertfourAAbatteries.
4. Replaceandsecurethebatterycover.
5. PressthebuttontoswitchONtheinstrument;Checkforcorrectoperation.

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.

OtherBatterySafetyReminders
oNeverdisposeofbatteriesinafire.Batteriesmayexplodeorleak.
oNevermixbatterytypes.Alwaysinstallnewbatteriesofthesametype.


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Specifications
Applicablestandards: IEC61672‐1:2003Class2
IEC60651:1979Type2
ANSIS1.4:1983Type2
IEC60804:1985Type2
Parameters:
A Afrequencyweightingsoundpressurelevel
C Cfrequencyweightingsoundpressurelevel
FAST Fasttimeweighting
SLOWSlowtimeweighting
IMP Impulsetimeweighting
SPL Currenttime‐weightedsoundpressurelevel
LeqEquivalentcontinuoussoundlevel(AorC)
SEL Soundexposurelevel(AorC)
SPLMAX Maximumsoundpressurelevel(AorC)
SPLMIN Minimumsoundpressurelevel(AorC)
PH PeakHoldsoundpressurelevel(AorC)
L:05 5%percentilesoundlevel(AorC)
L:10 10%percentilesoundlevel(AorC)
L:50 50%percentilesoundlevel(AorC)
L:90 90%percentilesoundlevel(AorC)
L:95 95%percentilesoundlevel(AorC)
SPLMAXMaximumtime‐weightedsoundpressurelevel(MAXsymbolblink)
Measurementrange:30to130dB
PeakHoldranges:
30–90range63–93dBPeakHold
40–100range73–103dBPeakHold
50–110range83–113dBPeakHold
60–120range93–123dBPeakHold
70–130range103–133dBPeakHold





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407780A‐EU‐ENv1.34/14
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
Self‐generatednoiselevel:
Typicalvaluesat23oC(73.4oF),usingthenominalmicrophoneequivalentcapacitanceof27pF
(30‐90dBrange)
WeightingElectricalTotal
A22.7dB26.1dB
C21.8dB29.5dB
Linearityoperatingrange:A‐weighted,1000Hz,60dBdynamicrange.
Totallinearoperatingrange:InaccordancewithIEC61672‐1,A‐weighted,1000Hz:30dBto
130dB.
Levelrangeselection: 5rangesin10dBsteps30to90dB,40to100dB,50to110dB,
60to120dB,70to130dB
LinearOperatingRanges(L.O.R.)

RANGE:30–90dB.Teststartingpoint64dBforallweightingsandfrequenciesexcept31.5HzA‐
weighted,forwhichthestartingpointis44dB.
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FREQUENCY
HzWEIGHTINGL.O.R. dBWEIGHTINGL.O.R. dB
31.5A36.1–50.6C39.5–87.0
1000A36.1–90.0C39.5–90.0
4000A36.1–90.0C39.5–89.2
8000A36.1–88.9C39.5–87.0
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RANGE:40–100dB.Teststartingpoint74dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis54dB.
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FREQUENCY
HzWEIGHTINGL.O.R. dBWEIGHTINGL.O.R dB
31.5A40.0–60.6C40.0–97.0
1000A40.0–100.0C40.0–100.0
4000A40.0–100.0C40.0–99.2
8000A40.0–98.9C40.0–97.0
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RANGE:50–110dB.Teststartingpoint84dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis64dB.

FREQUENCY
HzWEIGHTINGL.O.R dBWEIGHTINGL.O.R dB
31.5A50.0–70.6C50.0–107.0
1000A50.0–110.0C50.0–110.0
4000A50.0–110.0C50.0–109.2
8000A50.0–108.9C50.0–107.0
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407780A‐EU‐ENv1.34/14
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RANGE:60–120dB.Teststartingpoint94dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis74dB.

FREQUENCY
HzWEIGHTINGL.O.R. dBWEIGHTINGL.O.R. dB
31.5A60.0–80.6C60.0–117.0
1000A60.0–120.0C60.0–120.0
4000A60.0–120.0C60.0–119.2
8000A60.0–118.9C60.0–117.0
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RANGE:70–130dB.Teststartingpoint104dBforallweightingsandfrequenciesexcept31.5Hz
A‐weighted,forwhichthestartingpointis84dB.

FREQUENCY
HzWEIGHTINGL.O.R. dBWEIGHTINGL.O.R. dB
31.5A70.0–90.6C70.0–127.0
1000A70.0–130.0C70.0–130.0
4000A70.0–130.0C70.0–129.2
8000A70.0–128.9C70.0–127.0
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Frequencyrange: Overallcharacteristicsincludingmicrophone:31.5to8000Hz
Frequencyweighting: A,meetstherequirementofIEC61672‐1forclass2Aweighting.
C,meetstherequirementofIEC61672‐1forclass2Cweighting.
Timeweighting(RMSdetection): Fast,accordingtoIEC61672‐1class2.
Slow,accordingtoIEC61672‐1class2.
Impulse,accordingtoIEC61672‐1class2.
Referenceconditions:
Typeoftheacousticfield: Free
Referencesoundpressurelevel: 94.0dB(relatedto20Pa)
Referencelevelrange:  60to120dB
Referencefrequency:  1000Hz
Referencetemperature:  +23oC(73.4oF)
Referencerelativehumidity: 50%RH
Referencestaticpressure: 101.325kPa
Referenceincidencedirection: Perpendiculartothefrontofthemicrophonediaphragm.
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407780A‐EU‐ENv1.34/14
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Calibration:
Acousticalcalibrator(Extech407744orequivalent)
Calibrationcheckfrequencyis1000Hz.
Nominalcalibrationlevelforthefreefield:94.1dB
Nominalcalibrationlevelforthediffusefield:94.0dB
Frequencyforacoustictesting: 8000Hz
Warm‐uptime: ≤2min
Samplinginterval: Bargraphindication125msapprox.
Numericindication1secapprox.
Datarecordcapacity: Datacanbestoredinmemory.
Max.32000readingscanbestored
Max.255blocks
LCDDisplay
Displayscreens:
4digitnumericalindicationofsoundlevel,from30.0to130.0dBwith0.1dBresolution.
Bar‐graphindicationofcurrentsoundlevelwith1dBresolution.
Soundlevelrangeindicator:30–90dB,40–100dB,50–110dB,60–120dBor70–130dBinfive
ranges.
Timedisplay;year–month–dayandhour:minute:second.
Displayupdaterate:1second
Display’sstart‐upindication:Dependsontheconditionofmeterwhenitwaslastswitchedoff.
Warningindications:
Out‐of‐rangeindications:
OVERdisplayedatupperlimitoftherange
UNDERdisplayedatlowerlimitoftherange
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Outputs
ACoutput(usingselectedfrequencyweighting)
Outputvoltage: 2Vrms(atfull‐scaleoftherange)
Outputimpedance: 5kΩ
Loadimpedance: ≥1MΩ
DCoutput
Outputvoltage: 10mV/dB
Outputimpedance: 5kΩ
Loadimpedance: ≥1MΩ
I/Oconnector: Soundlevelmetercontrolfrom,anddataoutputto,PC(USB)
Alarmoutput: 5Vdc,typical
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407780A‐EU‐ENv1.34/14
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Powerrequirements
4x1.5VIECR6P(size“AA”)manganesesuperheavydutybatteriesorequivalent
Batterylife:Approx.24hours
Externalpowersource:DCvoltagefrom5Vto6V;Currentrating:Approx.20mA@6V
Ambientconditions:
Operatingconditions:‐10oCto+50oC(14to122oF),30%to90%RHnon‐condensing
Storageconditions:‐10oCto+60oC(14to140oF)<70%RHnon‐condensing
Effectoftemperature:<0.5dBfrom‐10to+50oC(14to122oF),
Effectofhumidity:<0.5dB(for30%RHto90%RHat40oC[104oF],1000Hz)
Effectofvibration:A40Hz1m/svibrationproducesnonoticeableeffect.
Effectofmagneticfield:Nonoticeableeffect.
StandardsCompliance:
:indicatescompliancewithapplicableEuropeanUnionDirectives.
EMCEmission:IEC61000‐6‐3,Genericemissionstandardforresidential,commercialandlight
industrialenvironments.Nosignificantemissionsfromtheinstrument.IEC61672‐1,
InstrumentationstandardclassificationgroupXandperformanceclass2soundlevelmeter.
EMCImmunity:IEC61000‐6‐2,Genericstandard‐Immunityforindustrialenvironments.No
degradationinperformancewhensubjectedto10V/mun‐modulated.
Dimensions: Approx.265(L)72(W)36(H)mm(10.4x2.8x1.4”)
WeightApprox.380g(includingbattery):(13.4oz.)
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Copyright©2014FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform
ISO‐9001Certified
www.extech.com
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