Simrad SX90 - INSTALLATION REV C - Receiving Voltage Response (VR) Measurements; Preparations; Test Procedure

Finaltestsandmeasurements
Receivingvoltageresponse(VR)measurements
Inordertomeasurethereceivingvoltageresponse,usethetest
hydrophoneinthesamepositionasfortheprevioussourcelevel
measurements.
Preparations
Usethefollowingmenusettingsonthesonar.
1OpentheSetupmenu.
2ClicktheT estbuttontoaccessuptheSystemTestmenu.
3ClicktheTestCongbutton.
4ObservethattheTestCongparameterdialogueopensatthe
bottompartofthemenueld.
5SelectNoise&VRtoselectthemenusettingsforthe
receivingvoltageresponse.
6ClickClose.
Alltherequiredsonarparametersforthevoltageresponse
measurementshavenowbeensetautomatically.
Testprocedure
Observethefollowingproceduretomeasurethereceivingvoltage
response.Notethattheprocedurecallsforanoscilloscopeanda
testoscillator.
1Checkthatthebearingandtiltanglevaluesarethesameas
forthesourcelevelmeasurements.
2ObservetheEchoLevelread-outintheSystemtestmenu.
•Thisistheecholevelwhich-withoutasignaloscillator
connected-isthenoiselevelfortheselectedbearing.
ThecurrentvalueisshownontheEcholevelbutton.
3EntertheEchoLevelvalueintothecellfornoiselevelinthe
Measurementandcalculationresultstable.
4Connectasignaloscillatortothehydrophone.
5Adjusttheoscillatorfrequencyto26.0kHz.
6Connecttheoscilloscopechanneltomeasuretheoutput
voltagetothehydrophone.
7AdjusttheoscillatorvoltageuntiltheEchoLevelread-out
shows0.0dB.
8EnterthemeasuredhydrophonevoltageU(p-p)intothe
Measurementandcalculationresultstable,andcalculatethe
UHydrvoltageinthesametable.
9MaketherequisitecalculationsintheMeasurementand
calculationresultstable,andentertheresultintothe
Receivingvoltageresponse(VR)table.
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