Kongsberg Simrad ST90 - Measuring the B-Scan Noise with the Transducer Disconnected from the Transceiver Unit

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Result
Foreachtransmitfrequency(inkHz),writedownthemeasurednoiselevels(indB).
Frequency(kHz)NoisecircleAverageMaximum
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Requirements
Results
Themaximumdifference(indB)betweentheaverageandmaximumnoisevaluesontheNoisepagemustbe
lessthan:3
Maximumnoiselevel(indB)measuredontheNoisepage:
Date/Signature:
MeasuringtheB-Scannoisewiththetransducerdisconnected
fromtheTransceiverUnit
Lownoiseisakeyfactorforhighqualityandreliablemeasurements.Theperformanceof
theST90systemwillalwaysbelimitedbydifferentnoisesources.Ahighnoiselevelwill
masktheechoesandmakethemdifculttoreadandinterpret.Thenoiseismeasuredwhile
theST90systemoperatesinPassivemodewiththetransmitpulsesdisabled.
Prerequisites
TheST90systemhasbeensetupwithitshardwareunitsconnectedasspeciedinthe
InstallationManual.ThehullunitandtheMotorControlUnitarereplacedwithahullunit
simulator.Thetransducerisreplacedwithadummyload.TheST90systemisturnedonand
operatesnormally.Neithertoolsnorinstrumentsarerequired.
Context
Thistaskallowsyoutocheckthenoiseconditions.Tomeasurethenoiselevel,observethe
valuepresentedontheB-ScanpageintheElementBITE(ElementBuiltInTestEquipment)
dialogbox.
SimradST90FactoryAcceptanceTest