Extech Instruments 400790A User manual

User Manual
RealTimeOctaveBandAnalyzer

Model407790A

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TableofContents
1.INTRODUCTION................................................................................................3
1.1 Instrument Care............................................................................................4
1.2 Features........................................................................................................5
2.DESCRIPTIONS ................................................................................................6
2.1 Meter Description..........................................................................................6
2.2 Operation Buttons.........................................................................................7
2.3 Display Screen..............................................................................................9
2.4 Analysis screen........................................................................................... 11
2.5 Numeric Display screen..............................................................................12
3.MEASUREMENT PREPARATION AND SETUP ............................................13
3.1 Setting the Date and Time..........................................................................13
3.2 SD Memory Card........................................................................................15
3.3 Setting the Backlight Auto Off time.............................................................15
3.4 Sub Channel Settings.................................................................................16
3.5 Selecting the Lmax/Lmin type ....................................................................17
3.6 Comparator Output Operation....................................................................18
3.7 Trigger Mode Setup and Operation............................................................21
3.7.1TriggerSetup...........................................................................................................22
3.7.2ExternalTriggerSetting ..........................................................................................22
3.7.3TriggerTimeSetting ...............................................................................................22
3.7.4TriggerLevelSetting ...............................................................................................23
4.MEASUREMENTS.............................................................................................25
4.1 Sound Level Measurements.......................................................................25
4.2 SEL, Leq, Lmax, Lmin, LN Measurements.................................................26
4.3 Sound Level and Octave BandAnalysis Measurement .............................28
4.4 Sound Band - Leq, SEL, Lmax, Lmin and LN Analysis Measurement.......30
5. STORING DATA TO MEMORY ........................................................................32
5.1 Manual Memory Storage ............................................................................32
5.2 Recalling Manually Stored Data .................................................................35
5.3 Erasing Manually Stored Data....................................................................37
5.4 Auto 1 Memory Storage..............................................................................38
5.5 Auto 2 Memory Storage..............................................................................41
5.6 Erasing Auto Stored Data ...........................................................................42
6. SOFTWARE DOWNLOAD AND INSTALLATION ...........................................43
7. SOUND PRESSURE LEVEL - TECHNICAL NOTES......................................44
8. CALIBRATION..................................................................................................45
9. SPECIFICATIONS............................................................................................46
10. WARRANTY ...................................................................................................49

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1. Introduction
CongratulationsonyourpurchaseoftheExtech407790ARealTimeOctaveBand
Analyzer.ThisautorangingType2integratingsoundlevelmeterfeatures1/1and
1/3OctaveBandreal‐timenoiseanalyses.The407790Aoffersfivemeasurement
parameters:SPL(SoundPressureLevel),Leq(EquivalentContinuousSoundPressure
Level),SEL(SoundExposureLevel),Lmax(MaximumSoundPressureLevel),andLmin
(MinimumSoundPressureLevel).Thebuilt‐inmemorystores12,280datarecordsin
soundlevelmodeand1024recordsinOctavemode.Thestoreddatacanbeeasily
transferredtoaPCwiththe407790AsoftwareandUSBcable.Thismeterpermits
choiceof‘A’,‘C’,orFlat’Z’weightingandSlow/Fast/impulseresponsetimes.AC
andDCanalogoutputsignalsareavailableforchartrecordersandotherexternal
recordingdevices.Carefuluseofthisdevicewillprovideyearsofreliableservice.


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1.1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sulfur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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1.2Features
TheSoundLevelMetercomplieswiththerequirementsofIEC61672‐1:2003standardfora
Class2instrument.Seespecificationssectionformoreapplicablestandardsthatapplytothis
meter.
1/1octavebandanalysisfrom31.5Hzto8kHz
1/3octavebandanalysisfrom25Hzto10kHZ
Canperform1/1and1/3octavebandanalysissimultaneously
4GBMicroSDcard
USBinterface
Dataloggingfunction
AC/DCsignaloutputavailableforlevelandgraphicrecorder
Comparatoroutputfunction
Externaltriggerinputfunction
Realtimeclockwithcalendar
Mainchannel(soundmeter,analyzermode)
SubChannel(soundlevelmetermode)

The407790Aallowsthefollowingquantitymeasurements.
Simultaneousmeasurementsofallitemswithselectedtimeweightingandfrequency
characteristics.
Soundlevel  Lp
EquivalentcontinuoussoundLeg
Soundexposurelevel SEL
Maximumsoundlevel Lmax
Minimumsoundlevel Lmin
Percentilesoundlevel LN(L05,L50,L90,L95)calculatedfromLp
Frequencyrating A,C,Z
Timeweighting
MainChannel Fast,Slow,10ms,impulse
SubChannelFast,Slow,10ms,impulse

SafetySymbol:ComplieswithEMC


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2. Descriptions
2.1MeterDescription
Refertothediagrambelowforthefollowingdescriptions.
1. Windscreen
2. Microphone
3. Display
4. Operationkeys
5. 6VDCadapterjack
6. DCanalogoutputjack
7. ACanalogoutputjack
8. Comparatoroutputjack
9. TrigINjack
10. MicroSDcardslot
11. Powerswitch
12. Handstrap
13. USBport
14. Batterycompartment
15. Tripodmountingscrew








FAST
L
2k
[ 1 / 3 OCT ] 01 / 06 / 19 14:26:39
20
40
31.5Hz 500125
60
80
dB
100
A W
W8k L
65.2 dB
IEC 1260 CLASS2
OFF ON
POWER CAL
IEC LR14 1.5V X 4
ACCURACY : ¡Ó1.5dB
OFF ON
DC AC
CONTRAST
OUTPUT
DC6V LIGHT
SOUND ANALYZER
IEC 651 IEC 804 TYPE 2
1/1 & 1/3 OCTAVE BAND

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2.2OperationButtons




START/STOPbutton
Presstostartorstopforrecordingthesoundpressuremeasurement.

PAUSE/CONTbutton
Presstotemporarilypause()ameasurement)orresume()measurement.

Mbutton
Presstoscrollthroughandselectdifferentprocessingmodes.

 LEVEL
Presstoselectthelevelrangeformeasurement.Thefollowingfivesettingsareavailable.
20to90dB,20to100dB,20to110dB,30to120dB,40to130dB.
GRP/NUMbutton
PresstoswitchbetweengraphandnumericdisplayforOctavemeasurements.
SLM1/11/3button
Presstoswitchtoselectthesoundlevelmeterdisplayandanalysisscreen.
(SLM,1/1,1/3,1/1&1/3)
MENU
Presstoentermenuscreentosetupvariousmenuparameters.Pressagaintoclosethe
menu.
Rbutton
StartorstoptheautoRecordprocessorpresstomanuallystorethemeasurementdatainto
memory.

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/
Presstomovetheoctavefrequencybandmarkerduringfrequencyanalysis.

+/
-
Presstoselectandsetitemsinvariousmenuscreens.Holdingthebuttonsdownwillcause
fasterscrolling.
FREQWEIGHTTIMEbutton
TheFREQWEIGHTselectsthefrequencyweightingforthemainchannel.“A”weighting(A),
“C”weighting(C),andflatfrequencyresponse(Z).

TheTIMEWEIGHTselectsthetimeweightingfunctionforthemainchannel.(F,S,10ms,I)
Fast:125ms;Slow:1000ms;10ms;Impulse:35ms
Note:Thefrequencyandtimeweightingforthesubchannelcanbeselectedbyaccessing
themenuscreen.
button(Backlight/Enter)
Backlightpowersonthedisplaybacklight.Pressthebuttonagaintoturnbacklightoff.
WhenautomaticBacklightOfffunctionisselectedfromthemenuscreen,thebacklightwill
turnitselfoffautomaticallyafterthepresettime.

Enterbuttonwillfinalizeasettingofaniteminamenuoranyothersetting.


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2.3DisplayScreen
Mode of analysis
Measurement in progress symbol
USB link status
Trigger mode
Elapsed time
Memory
Store mode
Address
Level range
Overload indication
Sub channel level display
Sub channel
Time weighting
Frequency weighting
Current time
Current date
Comparator ON
Auto store full indication
Manual store full indication
Power
status
Main channel level
display
Time weighting
Main channel
Frequency weighting
Under range indication
Bar graph
1. Modeofanalysis:Indicatestheconditionofthedisplayscreen.
SLM:Soundlevelmeterdisplay
1/1 OCT:Octavebandanalysisscreen
1/3 OCT:1/3 Octavebandanalysisscreen
1/1 and1/3 OCT:Simultaneousoctaveand1/3 octavebandanalysisscreen
2. Measurementinprogress:Whenameasurementrecordingisinprogressorduringautostore
thesymbolflashes.Duringmeasurementpausethesymbolisdisplayedonthescreen.
3. USBLinkStatus:ShowsiftheUSBisenabledordisabled.
4. TriggerMode:Controlsthemeasurementandmemoryautostorestartbehavior.Available
modesare:Level1(LV1),Level2(LV2),EXT(EXT),andtime(TIME).
5. ElapsedTime:Displaystheelapsedtimeinsecondsduringprocessingandstoringmemory.
6. Memory:Displaystheselectedmemoryforstoringdata.
FL:Thedatawillbestoredintheinternalmemoryofthemeter.
Sd:ThedatawillbestoredonthemicroSDcard
7. Storemode:Displaystheselectedmodeforstoringdatainmemory
M:Manualstore
A:Autostore

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8. Address:Displayscurrentnumberofdatasurveysstoredinmemory.
9. Bargraph:Displaysthesoundlevelasabargraph.(Thedisplayisupdatedevery100ms)
10. Levelrange:Displaystheupperandlowerlimitofthebargraph.Canbechangedwiththe
LEVELbutton.
11. Under‐rangeindication:Whenasignalisunder‐rangetheUNsymbolwillappearonthe
screen.UsetheLEVELbuttontodecreasethelevelrangesetting.Ifprocesseddatais
under‐rangetheUNindicationwillremainonthescreenuntilthenextprocessing
measurementisstarted.
12. Overloadindication:Whenasignaloverloadisdetected,thescreenwilldisplayOVforat
least1second.UsetheLEVELbuttontoincreasethelevelrangesetting.Ifprocessed
dataisoverrangetheOVindicationwillremainonthescreenuntilthenextprocessing
measurementisstarted.
13. Mainchannelfrequencyweighting:Indicatesthemainchannelfrequencycharacteristic.A:
A‐weighting,C:C‐weighting,Z:Z‐weighting(flatresponse)
14. Mainchanneltimeweighting:Indicatesthemainchanneltimeweightingcharacteristic.
F:Fast(125ms),S:Slow(1000ms),τ:(10ms),I:Impulse(35ms)
15. Mainchannelleveldisplay:Displaysthemeasuredsoundlevelinthemainchannel.
(Thedisplayisupdatedeverysecond).
16. Subchannelfrequencyweighting:Indicatesthesubchannelfrequencyweighting
characteristic.A:A‐weighting,C:C‐weighting,Z:Z‐weighting(Flatresponse).
Thesubchannelfrequencyweightingcanbesetfromthemenuscreen.
17. Subchanneltimeweighting:Indicatesthesubchanneltimeweightingcharacteristic.
F:Fast(125ms),S:Slow(1000ms),τ:(10ms),I:Impulse(35ms)
18. Subchannelleveldisplay:Showsthemeasuredsoundlevelinthesubchannel.
(Thedisplayisupdatedeverysecond)
19. Powerstatus:Whenoperatingthemeteronbatterypowertheyellowsegmentswill
decreaseasthebatterypowerdrains.Whenthesegmentstartstoflash,replacebatteries.
Yellow Yellow Yellow Yellow Red

Batterygood‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐>ReplaceSegmentflashes(critical)
20. Manualstorefull:Whenthemanualstoredmemoryisfull,theMFulsymbolisdisplayed.
Themanualdatastorecapacityis250sets.
21. Autostorefull:Whentheautostorememoryisfull,theAFulsymbolisdisplayed.Theauto
storecapacityis250blocks.
22. ComparatorON:WhenthecomparatorfunctionhasbeensettoONandasignalexceeds
thecomparatoroutputjack,theindicatorCmpwillappearonthedisplay.Asignalwill
outputfromthecomparatoroutputjackonthesidepanel(opencollector).
23. Currentdate:Displaysthecurrentdate
24. Currenttime:Displaysthecurrenttime

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2.4Analysisscreen
Anexampleforthe1/1&1/3OCTanalysisscreenisshownbelow.
Usetheandbuttonstomovethecursortothetargetfrequencyband.


1/1and1/3analysisscreen

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2.5NumericDisplayscreen

Examplefor1/1OCT,1/3OCT,and1/1&1/3OCTanalysisscreenareshownbelow.
Usetheandbuttonstoviewafrequencythatisnotdisplayed.


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3. MeasurementPreparationandSetup
1. Batteryinstallation:Removetherearbatterycoverasshownbelowandinsert(4)1.5V‘C’
sizealkalinebatteries.Takecaretoobservebatterypolarity.Replacethebatterycover.
2. Batteryreplacement:Whenthebatteryvoltagedropsbelowoperatingvoltage,
batterysymbolflashesonthedisplay.
3. ACadaptorconnection:InserttheadaptorintheDC6Vjackonthesidepanel.WhentheAC
adapterisconnected,themeterwillbepoweredfromtheadapterevenifbatteriesare
installed.
Notes:
Topreventtheriskofdamage,useonlythefactorysuppliedACadapter.
Topreventtheriskofbatteryleakage,removethebatteriesfromthemeterwhenthemeteris
notinuse.
3.1SettingtheDateandTime
Dateandtimeinformationisstoredwitheachrecordsaved.Setthedateandtimeasfollows:
1. PresspowerswitchONandwaituntilthemeasurementscreenappears.
2. PresstheMENUbutton.Themenulistscreenwilldisplay.
3. Pressthe
+/
-buttontoselect“D)Datesetting(Y/M/D)”andthenpresstheenter
button.
4. Pressthe
+/
-buttontosetthevalue.Pressbuttontoconfirm.

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5. Continuepressingtheabovebuttonstoscrollthroughandseteachoptionfordateandtime.
ThemeterwillcontinuetoscrollthroughsetupfordateY/M/Dandthenthetimesettings
h/m/s.
6. Whenthesettingsarecorrect,pressthebuttontoexitthesettingmode.Theclockwill
startrunningwiththenewsettings.
7. PressMENUbuttontoreturntothemeasurementscreen.
Note:Theclockhasanerrorofabout1minutepermonth.Beforetakingmeasurement,besure
tocheckandsetthetimeifrequired.

Date
Time


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3.2SDMemoryCard
MeasurementdatacanbestoredonaremovableSDmemorycardforlateruse.
Note:PowerOFFthemeterbeforeinsertingorremovingthememorycard.

Useonlya4GBmicroSDcard.RemovingSDcardorpoweringthemeteroffwhiledataisstoring
tothecardcancauseinternaldatatobedestroyed.
1. Insertthecardtakingcaretoobservethecorrectorientation.Pushthecardincarefully,
untilitisproperlysealed.
2. Toremove,pushthecard.TheSDcardwithpopoutandcanberemoved.

3.3SettingtheBacklightAutoOfftime
1.Pressthe toturnthebacklightonoroff.
2.PresstheMENUkeytobringupthemenulistscreen.
3.Usethe
+/
-keytoselect“BacklightAutoOff”thenpressthekey.
4.Usethe
+/
-keytoselecttheautomaticturnofftimethenpressthekey.Options
are:30seconds,1minute,3minutesorOFF(withoutautomaticturn‐offfunction).
5.PressMENUkeytoreturntothemeasurementscreen.
Toturnthebacklightoffbeforetheautomaticturn‐offtime,pressthe key.




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3.4SubChannelSettings
Toaccessthesubmenusettingpressthefollowingbuttons.
1.PresstheMENUbuttontoenterthemenulistscreen.
2.Usethe
+/
-buttonstoselect“G).SubTimeWeight”thenpressbutton.
3.Usethe+/
-buttontoselectthedesiredtimeweighting
F,S,τ(10ms)orI(Impulse35ms),thenpressbutton.
4.Pressthe+/
-buttonstoselect“H).SubFreqWeight”thenpressbutton.
5.Pressthe
+/
-buttonstoselectthedesiredfrequencyweightingA,CorZ,thenpress
button.
6.PressMENUbuttontoreturntothemeasurementscreen.
Note:Thereisnofrequencyanalysisfunctionforthesubchannel.Onlytheall‐passvalueis
measured.


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3.5SelectingtheLmax/Lmintype
Band‐(Bandmaximum/bandminimum):
Theanalysisresultappliestothepointwherethelevelforeachfrequencybandwasmaximum
orminimumwithinthesamplingperiod.
AP‐(All‐passmaximum/all‐passminimum):
Theanalysisresultappliestothesubchannelall‐passandband‐passlevelvaluestakenatthe
pointwheretheall‐passlevelinthemainchannelwasmaximum/minimumwithinthe
samplingperiod.
AP(S)‐(All‐passmaximum/all‐passminimum):
Theanalysisresultappliestotheband‐passlevelvalues(excludingthesubchannelall‐pass
levels)takenatthepointwheretheall‐passlevelinthemainchannelwas
maximum/minimumwithinthesamplingperiod.Thesubchannelall‐passlevelistakenat
themaximum/minimumpointwithinthesamplingperiod,independentlyofthemain
channellevel.
1.PresstheMENUbuttontoenterthemenulistscreen.
2.Usethe
+/
-buttonstoselect“I).Lmax/LminType”thenpressbutton.
3.Usethe
+/
-buttonstoselectthedesiredBand,APorAP(S)typethenpressbutton.
4.PressMENUbuttontoreturntothemeasurementscreen.

ThissettingiseffectiveinSLMmodeandOctavebandanalyzermode.


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3.6ComparatorOutputOperation
Thecomparatoroutputisanopencollectoroutputthatcanbeusedtocontrolexternal
equipment.
1.PresstheMENUbuttontoenterthemenulistscreen.
2.Usethe
+/
-buttonstoselect“J).Comparator”thenpressbuttontodisplaythe
ON/OFFsetting.
3.Pressthe
+/
-buttonstoselect“ON”thenpressbutton.
4.Pressthe
+/ 
-buttonsagaintoselect“1).ComparatorLevel”.Setthedesiredlevel
thenpressbutton.(Settingrange25to130dB,1‐dBsteps)
5.Followtheabovestepstoselect“2).ComparatorBand”.Setthebandtodesiredlevelthen
pressbutton.(MAINAP/31.5Hz/63Hz/…8kHzor1/3octavebands).
6.PresstheMENUbuttontoreturntothemeasurementscreen.

AP
AP

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AP
AP
AP
AP






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Comparatoroutput:
IntheSLMmode,onlytheAPisselectedascomparatorband.
Inthe1/1OCTmode,onlytheAPor1/1octavebandisselectedascomparatorband.

Comparatoroutput:Open‐collectoroutput;band‐leveldetermination;
  Max.appliedvoltage:24VDC;Max.drivecurrent:50mADC

1
2
3

1.Comparator signal output continues for 0.5 seconds after the signal crosses the threshold level
2.ComparatorLevel
3.Time