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442703/B

361

Itisalwaysbesttodomakethenoise/speedcurveunderrealisticconditions.Thismeans

thatallrelevantvesselssystemsshouldbeinuseasundernormaloperations.However,

ifyouexperienceabnormallyhighnoiselevels,youmaywanttorepeatthetestwith

"silentship"settings.Toisolatenoisesources,turnindividualvesselsystemsonoroffto

monitoranychangesinthenoiselevel.

Procedure

1Makesurethatyouhavesufcientwaterdepthbelowthekeelbeforeyoulower

thetransducer.

2Lowerthetransducertoitsbottomposition.

3Ifnecessary,establishaseparatecommunicationlinewiththebridgetoverify

thevesselspeedduringthetest.

4Makethefollowingpreparations.

aAtthebottomoftheST90presentation,selectasuitablepresentationmode,

andactivatetheHorizontalview.

bOpentheOperationmenu.

•SetOperationtoNormal.

•SetTXPowertoOff.

cOpentheActivemenu.

•SelectNoTVG.

•SetPing-PingFiltertoOff.

•SetAGC(AutomaticGainControl)toOff.

•SetRCG(ReverberationControlledGain)to0(zero).

dOpentheSetupmenu.

eSelectBITEtoopentheBITE(Built-InTestEquipment)dialogbox.

fSelectNoisetoopenthepage.

5Repeatthefollowingcycleforeachvesselspeed:

aAskthebridgetosetthespeed.

bOncethebridgereportsthatthespeedhasbeenobtained,selectStartNoise

Measurements.

cIfpossible,verifythevesselspeedonthetopbar.

dRecordthevaluesintheresulttable.

eCalculatetheaveragenoise,andrecorditinthetable.

fAskthebridgetosetthenextspeed.

6Whenallthemeasurementshavebeenmade,typethedata(speedandnoise)intoa

spreadsheettocreatethecurve.

7Hoistthetransducertoitsupperposition.

Settingtowork

Simrad ST90 Installation Manual

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