Kongsberg Simrad EK80 User manual

kongsberg.com/ek80
TS Calibration EK80
INSTRUCTION
MANUAL

110-0001152/A
August2023©KongsbergMaritimeAS
PUBLIC
KongsbergEK80
Widebandscienticechosounder
UsermanualforTScalibration
Release23.6.0

KongsbergMaritimeAS
www.kongsberg.com
Documentinformation
•Product:EK80
•Document:UsermanualforTScalibration
•Documentpartnumber:110-0001152
•DocumentISBNnumber:N/A
•Revision:A
•Dateofissue:28August2023
Copyright
TheinformationcontainedinthisdocumentremainsthesolepropertyofKongsbergMaritimeAS.Nopartof
thisdocumentmaybecopiedorreproducedinanyformorbyanymeans,andtheinformationcontainedwithin
itisnottobecommunicatedtoathirdparty,withoutthepriorwrittenconsentofKongsbergMaritimeAS.
Warning
Theequipmenttowhichthismanualappliesmustonlybeusedforthepurposeforwhichitwasdesigned.
Improperuseormaintenancemaycausedamagetotheequipmentand/orinjurytopersonnel.Youmustbe
familiarwiththecontentsoftheappropriatemanualsbeforeattemptingtooperateorworkontheequipment.
KongsbergMaritimedisclaimsanyresponsibilityfordamageorinjurycausedbyimproperinstallation,
useormaintenanceoftheequipment.
Disclaimer
KongsbergMaritimeASendeavourstoensurethatallinformationinthisdocumentiscorrectandfairlystated,
butdoesnotacceptliabilityforanyerrorsoromissions.
Supportinformation
Ifyourequiremaintenanceorrepair,contactyourlocaldealer.Youcanalsocontactususingthefollowing
address:[email protected].Ifyouneedinformationaboutourotherproducts,visit
https://www.kongsberg.com.Onthiswebsiteyouwillalsondalistofourdealersanddistributors.

110-0001152/A3
Tableofcontents
ABOUTTHISMANUAL..................................................................5
INTRODUCTION...........................................................................7
Calibrationfortargetstrength(TS)measurements.................................................................7
Supportinformation................................................................................................................9
TSCALIBRATION.......................................................................10
PreparingTScalibration.......................................................................................................10
SelectingNormalOperationparametersforTScalibration.................................................13
Recordingrawdata...............................................................................................................14
StartingTScalibrationandcollectingechodataforsplit-beamtransducers........................15
StartingTScalibrationandcollectingechodataforsingle-beamtransducers.....................18
Choosingwhichrawdatale(s)toreplay............................................................................21
CleaningthecollectedTSdata(Split-beamtransducers).....................................................22
CleaningthecollectedTSdata(Single-beamtransducers)..................................................23
Modifying,addingandremovingafrequencyband.............................................................24
FUNCTIONSANDDIALOGBOXES...............................................25
CalibrationWizarddialogbox#1.........................................................................................25
CalibrationWizarddialogbox#2(SelectChannel).............................................................26
CalibrationWizarddialogbox#3(SelectSphere)...............................................................28
CalibrationWizarddialogbox#4(ImportData):Split-beamtransducer............................32
CalibrationWizarddialogbox#4(ImportData):Single-beamtransducer.........................40
CalibrationWizarddialogbox#5(ProcessData):Split-beamtransducer...........................48
CalibrationWizarddialogbox#5(ProcessData):Single-beamtransducer........................58
Secondaryfunctionsanddialogboxes..................................................................................68
ReplayFiledialogbox................................................................................................68
Edit/AddSpheredialogbox........................................................................................70
CalibrationDescriptiondialogbox.............................................................................72
SingleTargetDetectiondialogbox.............................................................................73
UsermanualforTScalibration

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KongsbergEK80

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Aboutthismanual
ThispublicationprovidesyouwiththebasicinformationrequiredtocalibratetheEK80
systemttedwithrelevanthardwarefortargetstrength(TS)measurements.
Relevantproducts
ThispublicationprovidesyouwiththebasicinformationrequiredtocalibratetheEK80
systemforcurrentindicatormeasurements.Thepublicationisvalidforthefollowing
products:
•KongsbergEK80
Targetaudience
CalibratingtheEK80systemforTSmeasurementsensuresthattheaccuracyisobtained.
Calibrationmustbetakenseriously.Toachievethebestresults,thecalibrationmustbe
plannedanddonecarefully.Duetothenatureofthedescriptionsandthelevelofdetail
providedbythispublication,itiswellsuitedforthosewhoare-orwishtobe-expertusers.
Agoodunderstandingofsystemfunctionsandcontrolsisessentialtofullytakeadvantage
ofthefunctionalityprovided.
Softwareversion
Thispublicationwascreatedforthefollowingsoftwareversion:23.6.0.
Onlineinformation
Allend-usermanualsprovidedforoperationandinstallationofyourEK80systemcan
bedownloadedfromourwebsite.Thisincludespublicationsthataretranslatedinto
otherlanguages.SelectedpublicationsarealsoprovidedinIETM(InteractiveElectronic
TechnicalManual)formats.Ourwebsitealsoprovidesinformationaboutotherproducts
fromKongsbergMaritime.
•https://www.kongsberg.com/ek80
Aboutthismanual

6110-0001152/A
Registeredtrademarks
Observetheregisteredtrademarksthatapply.
Simrad®,SIMRAD®andtheSimrad®logoareeitherregisteredtrademarks,ortrademarks
ofKongsbergMaritimeASinNorwayandothercountries.
Windows®isaregisteredtrademarkofMicrosoftCorporationintheUnitedStatesand
othercountries.
Wewantyourfeedback
Wealwayswanttoimproveourproducts.Wealsowantourend-userdocumentationto
becomprehensiveandrelevant.Y oucanhelp.Pleaseprovidecomments,suggestionsor
constructivecriticismtoanyofoursupportofces.
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Introduction
Topics
Calibrationfortargetstrength(TS)measurements,page7
Supportinformation,page9
Calibrationfortargetstrength(TS)
measurements
TargetStrength(TS)calibrationofanechosounderservestwopurposes.Itensuresaccurate
measurementsbycharacterizingandcompensatingforvariationsinthetransducer,the
transceiverandtheenvironment.Itisalsothebestwaytoensurecorrectoperationof
theentiresystem.Werecommendthatyouperformacalibrationbothbeforeandafter
animportantsurvey.
Whenstarting,theEK80systemdoesavalidationcheckofthecalibration.Itchecksifthe
previouscalibrationwasdoneusingthesametransceiverasincurrentuse.Ifthisisnotthe
caseamessagewillrequireanewcalibration.
Note
Calibrationmustbetakenseriously.Toachievethebestresults,thecalibrationmustbe
plannedanddonecarefully.
Duringstartup,theEK80systemwillcheckifacalibratedtransducerpresentisconnected
tothesametransceiverasinthepreviouscalibration.Ifnot,theoperatorisnotied,anda
requesttoconrmthecalibrationisissued.
InordertoperformaTScalibrationoftheEK80system,areferencetarget(calibration
sphere)withknownTSisloweredintothesoundbeam.ThemeasuredTSiscomparedwith
theknowntheoreticalTSofthesphere,andtheEK80systemisadjustedaccordingly.
Introduction

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Inthiscontext,thetransducerbeamisconicallyshapedwithacross-sectionareaincreasing
withthedepth.Asplit-beamtransducerhasthreeorfoursectors.Thecircularcross-section
issplitintoseveralslices.
TosuccessfullycalibratetheEK80systemyouneedtoplaceanumberoftargetdetectionsin
eachslice.Theechoesmustbedistributedwithintheentirebeamcross-section.Inorderto
dothis,thetargetspheremustbephysicallymovedinsidethebeamduringthecalibration
process.Thenumberofspheredetectionsshouldbeapproximatelythesameforeachslice,
andintotalnotmorethan100forthewholebeamcross-section.
AnyadjustmentstotheEK80systemlesaredoneautomatically.Nogainadjustmentsare
required.
AnewcalibrationmayalsoberequirediftheEK80softwareisupdated.Refertothe
softwarereleasenote.
TheinformationprovidedbythecalibrationisenteredintotheEK80softwareasoperational
parameters.Thisisdoneautomatically.TheEK80systemusesthenarrow-bandcalibration
forCWoperations,andthewide-bandcalibrationforLFMoperations.Innarrow-band
calibration,thefactorygainandtheSacorrectionarestoredfortheselectedpulselength.
Thebeamopeningandoffsetvaluesarestored/updatedforthelastroundofcalibration.
•ForaCWoperationwithanot-calibratedpulselength,thefactorygainandtheSa
correctionwillbeused,whereasthebeamopeningandoffsetvalueswillbeextracted
fromthelastroundofcalibration.
•ForaLFMoperation,thewide-bandcalibrationisusedforallpulselengths.
ATScalibrationcanalsobea"sanity"checkofthesystem,asitallowsyoutoverifythatall
partsofthesystemworkcorrectly.
Tip
WerecommendthatyoucalibratetheEK80incalmsea.Inareaswithcalmseaandlow
seacurrents,positioningthesphereandkeepingitwithinthedetectionareaoftheEK80
transduceriseasier.
Sacorrection
TheSacorrectionisonlycalculatedforCWtransmissions.
•WhencalibratingaWideBandTransceiver(WBT),theeffectivepulsedurationis
calculatedandusedtoestablishtheSacorrection.ThiswillnormallyresultinaSa
correctionaround0dB.
•WhencalibratingaGeneralPurposeTransceiver(GPT),theSacorrectionisbasedonthe
nominalpulseduration.ThiswillnormallyresultinaslightlynegativeSacorrection.
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Supportinformation
IfyouneedtechnicalsupportforyourEK80,youmustcontactyourlocaldealer,oroneof
oursupportofces.Alistofallourofcesanddealersisavailableonourwebsite.Youcan
alsocontactourmainsupportofceinNorway.
Globalsupport24hours
Oursupportteamcanbereachedatallhoursusingoneofthefollowingoptions:
•KM-SupportApp:www.kongsberg.com/no/maritime/support/km-support-app
•Website:www.kongsberg.com/ocean-science
•Emailaddress:[email protected]g.com
•Telephone:[phone]
Introduction

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TScalibration
Topics
PreparingTScalibration,page10
SelectingNormalOperationparametersforTScalibration,page13
Recordingrawdata,page14
StartingTScalibrationandcollectingechodataforsplit-beamtransducers,page15
StartingTScalibrationandcollectingechodataforsingle-beamtransducers,page18
Choosingwhichrawdatale(s)toreplay,page21
CleaningthecollectedTSdata(Split-beamtransducers),page22
CleaningthecollectedTSdata(Single-beamtransducers),page23
Modifying,addingandremovingafrequencyband,page24
PreparingTScalibration
Calibrationisthebestwaytocheckandverifyboththeoperationalperformanceofthe
EK80andthequalityoftheinstallation.InordertoperformaTScalibrationoftheEK80
system,areferencetarget(calibrationsphere)withknownTSisloweredintothesound
beam.ThemeasuredTSiscomparedwiththeknowntheoreticalTSofthesphere,andthe
EK80systemisadjustedaccordingly.Priortocalibration,asuitablegeographicallocation
mustbefound.Thenecessaryequipmentforlowering,hoistingandhandlingthetarget
spheremustbesetup.
Prerequisites
BeforestartingtheTScalibrationprocessthereareafewkeypreparationstoconsider:
•Asuitablelocationmustbeselectedbeforethecalibrationcanstart.
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•HardwaresuchastransceiversandtransducersmustbeinstalledintheEK80software.
•Navigationalinputmustbeinplace,meaningaGPSandMRUmustbeconnected.
•Acquireasoundvelocityprole.
•Setupthecalibrationsphereandwinches.
•Ifnecessary,createafoldersystemforthedataanddenethelocationofwheretosave
thedata.
Thefollowingequipmentisrequiredforcalibration:
•Calibrationspheres:Thecalibrationspheresmustbechosentomatchtheoperational
frequenciesusedbytheEK80system.
•Wincharrangement:Thewincharrangementmustprovidethenecessarylinestolower
thesphereintothesoundbeam.
Thevesselmustbeanchoredinasuitablepositionwithsufcientdepth,calmandsheltered
water,andminimumseacurrents.
Note
Eachcalibrationspheremustbehandledwithcaretoavoidanydamagetoitssurface.When
notinuse,storethesphereintheboxprovided.Allsuspensionlinesmustbeasthinandclean
aspossible.Limitknotstoaminimum,andkeepthemsmall.Evenknotshavestrongechoes!
KongsbergMaritimecansupplyavarietyofcopperandtungstencalibrationspheres
dedicatedfordifferentoperationalfrequencies.ContactyourdealerortheKongsberg
supportorganizationforadvice.
•[email protected]
Context
InordertoperformaTScalibrationoftheEK80system,areferencetarget(calibration
sphere)withknownTSisloweredintothesoundbeam.ThemeasuredTSiscomparedwith
theknowntheoreticalTSofthesphere,andtheEK80systemisadjustedaccordingly.The
TScalibrationrawdataisrecordedandstoredinan.xmlleforlateruse.
AnyadjustmentstotheEK80systemlesaredoneautomatically.Nogainadjustmentsare
required.
Note
Calibrationmustbetakenseriously.Toachievethebestresults,thecalibrationmustbe
plannedanddonecarefully.
InanEK80systemconsistingofmorethanonetransceiver,youmustcalibratethemoneby
one.
TScalibration

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•AddinganewtransducertoapreviouslycalibratedEK80systemrequiresacalibration
ofthenewchannel.
•Movinganalreadycalibratedtransducerfromonetransceivertoanotherrequiresanew
calibrationofthenewlyconnectedtransducerandtransceiver.
•Reconnectinganalreadycalibratedtransducerandtransceiverpair,theoldcalibration
datamayberetrievedandused.Anewcalibrationisnotrequired.
AnewcalibrationmayalsoberequirediftheEK80softwareisupdated.Refertothe
softwarereleasenote.
TheinformationprovidedbythecalibrationisenteredintotheEK80softwareasoperational
parameters.Thisisdoneautomatically.
Westronglyrecommendthatcalibrationsurveysaredoneatregularintervals.Asa
minimum,calibrationmustbedonepriortoeachsurvey.
Procedure
1Anchorthevesselinasuitablepositionwithsufcientdepth,calmandshelteredwater
andminimumseacurrents.
2StarttheEK80program.
aMakesurethattheEK80systemwithalltransceiversandtransducersareinstalled
correctly.
bSetOperationtoNormal.
cStartpinging.
dMakesurethattheEK80systemisfullyoperationalonallchannels.
3Measurethewatersalinityandtemperaturebetweenthetransducerandthedepthofthe
calibrationsphere.
4Calculatetheaveragesalinityandtemperaturevalues,andtypetheseintothe
Environmentdialogbox.
ThesoundvelocityisautomaticallycalculatedbytheEK80system.Thecorresponding
absorptioncoefcientiscalculatedbytheEK80systemaccordingtoFrancois&
Garrison,JASADecember1982.
Note
WhenyoucalculatetheTS,youmustusethesoundvelocityatthedepthofthesphere.
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5IntheNormalOperationdialogbox,setuptheoperatingparametersforthechannel
youwishtocalibrate.
Note
WhenyoucalibratetheEK80systemforTSmeasurementswith"livedata",itisvery
importantthatyouchoosethecorrectchannel,andthatalltheotherchannelsare
switchedtoPassivemode.Youmustdothisbeforeyoustartthecalibrationprocess.
InanEK80systemconsistingofmorethanonetransceiver,youmustcalibratethem
onebyone.
SelectingNormalOperationparametersforTScalibration,page13
6Lowerthesphereintothebeamatthespecieddepth.V erifythattheechoesareclearly
detected.
SelectingNormalOperationparametersforTS
calibration
ThepurposeoftheNormalOperationdialogboxistoprovideyouwithanoverviewofthe
currenttransceiverparameters.Italsoallowsyoutochangetheseparameterstomatchyour
currentoperatingrequirements.Theparametersforeachchannelmustbedenedbefore
thecalibrationstarts.
Prerequisites
Eachparametermustbedenedtomatchthepropertiesofthechannel.Inthiscontext,
thetermchannelisusedasacommontermtoidentifythecombinationoftransceiver,
transducerandoperatingfrequency.
Procedure
1OpentheOperationmenu.
2SelectNormalOperation.
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3IntheNormalOperationdialogbox,settheoperatingparameters.
aFortherelevantchannel,setPulseTypetoFMorCWaspermittedbyyour
transducer.
bSetPulseDurationtoyourchosenvalue.
cSetPowertothecorrectpowerlevelforthetransducer.
dSetStartFrequencyandEndFrequencytovaluespermittedbyyourtransducer.
eSetRampingtoFast.
4SelectOKtosavetheselectedsettingandclosethedialogbox.
Recordingrawdata
UsetherawdatarecordingfunctionalityprovidedbytheEK80systemtosaveechodata
usingthe*.rawformat.Youcansavethedatatotheharddisk,orontoanexternalstorage
device.IfyourProcessingUnitisconnectedtoalocalareanetwork,youcanalsosavetoa
networkdisk.TherecordingiscontrolledbytheRecordRA Wfunction.
Prerequisites
Beforeyoustartdatarecording,makesurethatyouhave
denedwheretostoretheles.Todenewhichdisksand
folderstousetosavethedatales,usetheFileSetuppage.
TheFileSetuppageislocatedintheOutputdialogbox.
Ifyouwishtosaveyourrecordeddataonanexternalhard
disk,makesurethatitisconnectedtotheProcessingUnit.
Context
Thecalibrationprocesscreatesanextensivesetofrawdatales.Youmustdeneanduse
astandardnamingconventionforthedatales.Eachlenamemustbeunique.Thele
namemustcontainanumberofdescriptivetermstoidentifythemainfeaturesofthedata
containedinthele.Suchdescriptivetermsmayinclude:
•Location
•Linenumber
•Projectname
•Projectnumber
Youmustalsocreateanduseasafelerepositoryforthedatales.Alocalpolicymustbe
adoptedtoreferenceanddocumentanyadditionsto-ordeviationsfrom-thislingsystem.
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Procedure
1OpentheOperationmenu.
2Tostartdatarecording,selectOnortheredcircleontherightsideoftheRecord
RAWbutton.
Alternatively,simplyselecttheredcircleontherightsideofthebutton.
TheRecordindicatoronthetopbarchangesitscolourtoreectthatrecordingisactive.
3Ifyouwishtoreducethesizeofthedataleyouarerecording,clickthemiddleof
theRecordRA Wbuttontoopenit,andselectSplitFile.
Thecurrentleisclosed,andanewleisautomaticallystarted.
4Tostoprecording,selectOffortheblackrectangleontherightsideoftheRecord
RAWbutton.
Alternatively,selecttheblackrectangleontheleftsideofthebuttontostopthe
recording.
StartingTScalibrationandcollectingecho
dataforsplit-beamtransducers
TheEK80calibrationisstartedbyrecordingrawdatafromthesphere.
Prerequisites
Thefollowingequipmentisrequiredforcalibration:
•Calibrationspheres:Thecalibrationspheresmustbechosentomatchtheoperational
frequenciesusedbytheEK80system.
•Wincharrangement:Thewincharrangementmustprovidethenecessarylinestolower
thesphereintothesoundbeam.
Thevesselmustbeanchoredinasuitablepositionwithsufcientdepth,calmandsheltered
water,andminimumseacurrents.
Context
WhenyoucalibratetheEK80systemforTSmeasurementswith"livedata",itisvery
importantthatyouchoosethecorrectchannel,andthatalltheotherchannelsareswitchedto
Passivemode.Youmustdothisbeforeyoustartthecalibrationprocess.
Procedure
1IntheOutputdialogbox,selectFileSetup.
TScalibration

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2OntheFileSetuppage,denetherelevantleandfolderproperties.
Note
Westronglyrecommendedthatyoualwaysstoretherawdatafromthecalibration.Set
uptheleandfolderparametersbeforeyoustarttherecording.
Usethelenametoidentifytheyourphysicallocation,thefrequencyused,which
calibrationspherethatisused,andthepulseform.Informationaboutthedataandtime
oftherecordingisautomaticallyaddedtothelename.
3Lowerthesphereintothebeamatthespecieddepth.
4IntheNormalOperationdialogbox,setuptheoperatingparametersforthechannel
youwishtocalibrate.
5Startpinging.
aSetOperationtoNormal.
bSetPingModetoInterval.
cSelectPingIntervaltospecifytheintervalbetweeneachping.
ThePingIntervalsuggestedvalueis1000ms.However,thisvaluemayvary
dependingontherangetothesphereandthewaterdepthatthelocationwhere
youareperformingthecalibration.
6OntheOperationmenu,opentheRecordRA Wbutton,andselectOn.
7OntheSetupmenu,selectCalibration.
8SelectNewcalibrationfromrawdata(RealtimeorReplay).
9SelectNexttocontinue.
10Onthesecondpageinthewizard:Selectwhichchanneltocalibrate.
ThesphereparameterscanbemodiedintheCalibrationWizarddialogboxpage3.
Youcanalsoaddanewsphereifitisnotlisted.
11SelectNexttocontinue.
12Onthethirdpageinthewizard:
SelectthespheretobeusedinTScalibration.Youcanalsoaddanewsphereifit
isnotlisted.Additionally,youcanadjustinhibitedfrequencybands,andaddand
removethem.
Modifying,addingandremovingafrequencyband,page24
13Onthefourthpageofthewizard:
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aAdjustthesizeoftheCalibrationWizarddialogboxsothatyoucanalsoseethe
echogram.
bIfnecessary,adjustthecalibrationlayer.
cIntheFrequency/TargetStrengtheld,verifythatthecalibrationtarget(sphere)is
usefulforthechosenfrequencyrange.
dIfnecessary,changetheTSDeviationtoalowernumericalvaluethanthedefault
setting.
eIfnecessary,adjusttheMinDepthand/ortheMaxDepthsettings.
fSelectCalibrationDescriptiontoopenthedialogbox.
TheCalibrationDescriptiondialogboxallowsyoutorecordinformationabout
yourcurrentcalibrationoperations.Youcantypeinanykindofrelevant
informationintotheCalibrationDescriptiontexteld.
CalibrationDescriptiondialogbox,page72
gSelectSingleTargetDetectiontocheckthesettings.
SingleTargetDetectiondialogbox,page73
hSelectStarttostartechodataimport.
•Duringthedataimport,usethethreewinchestomovethesphereinsidethe
soundbeam.TosuccessfullycalibratetheEK80systemyouneedtoplacea
numberoftargetdetectionsineachslice.Theechoesmustbedistributedwithin
theentirebeamcross-section.Inordertodothis,thetargetspheremustbe
physicallymovedinsidethebeamduringthecalibrationprocess.Thenumber
ofspheredetectionsshouldbeapproximatelythesameforeachslice,andin
totalnotmorethan100forthewholebeamcross-section.
•Duringthedataimport,monitorthecoverage.Coverage,page35
•Duringthedataimport,monitorthecalibrationlayer,andadjustifrequired.
Calibrationlayer,page37
iWhenyouhaveanappropriatenumberofhits,selectStop.
jStoptherecording.
kStoppinging.
lSelectSaveorSaveAstosavethecalibrationdata.
Youmustsavethecalibrationdatabeforeyoucontinuetopagefourinthe
CalibrationWizarddialogbox.Youarenotsavingrawechodatahere.Thisis
anXMLlecontainingtheinformationnecessarytoruntheactualcalibration
process.
mSelectNexttocontinue.
TScalibration

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Furtherrequirements
ProceedtothefthpageintheCalibrationWizard.
StartingTScalibrationandcollectingecho
dataforsingle-beamtransducers
TheEK80calibrationisstartedbyrecordingrawdatafromthesphere.
Prerequisites
Thefollowingequipmentisrequiredforcalibration:
•Calibrationspheres:Thecalibrationspheresmustbechosentomatchtheoperational
frequenciesusedbytheEK80system.
•Wincharrangement:Thewincharrangementmustprovidethenecessarylinestolower
thesphereintothesoundbeam.
Thevesselmustbeanchoredinasuitablepositionwithsufcientdepth,calmandsheltered
water,andminimumseacurrents.
Context
WhenyoucalibratetheEK80systemforTSmeasurementswith"livedata",itisvery
importantthatyouchoosethecorrectchannel,andthatalltheotherchannelsareswitchedto
Passivemode.Youmustdothisbeforeyoustartthecalibrationprocess.
TocalculatetheTSsingle-beamcalibrationforCWoperation,assumethatthestrongest
echoisreceivedwhenthesphereisclosesttothecentreofthesoundbeam.Then,usethis
valuetocalculatethecalibratedgain(G).
TocalculatetheTSsplit-beamcalibrationresultsforFMoperations,assumethatthe
strongestecoatthenominalfrequencyisreceivedwhenthesphereisclosesttothecentreof
thesoundbeam.Then,usethisechooverthefullfrequencyrangetocalculateG(f).Ifthe
nominalfrequencyisnotwithintheusedfrequencyrange,usethepeakvalueofTSforthe
frequencyclosesttothenominalfrequencyandcalculateG(f)fromthisecho.
Procedure
1IntheOutputdialogbox,selectFileSetup.
KongsbergEK80UsermanualforTScalibration