Simrad TRANSDUCER - INSTALLATION GENERIC REV H Installation Manual Page 43

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Transducerinstallation
Note
IftheMotionSensorperformsleverarmcorrectiontogiveheavedatavalidfor
anotherlocationthanwhereitisactuallymounted,itisthislocationwhichmust
bemeasured.
3SetuptheforwardaxisonthemotionsensorwiththeX-axisofthevessel’s
coordinatesystemtoanaccuracyof±0.1°.
4Setupthemotionsensorsuchthattheindicatedrollandpitchanglesfromthe
sensorwhenthevesselhasanormaltrim(thecoordinatesystem’shorizontalplane
ishorizontal)arelessthan±0.05°forbothrollandpitch.
Headingsensor
TheheadingsensormustbealignedwiththeX-axisofthevessel’scoordinatesystem
toanaccuracyof+0.255.Ifthisisnotpossible,theresultingoffsetmustbeknownto
thesameaccuracy.
Positioningsystem
1Measuretheverticallocationofthepositioningsystemantennawithanaccuracy
of±2cm.
Thisisonlyrequiredifthepositioningsystemmeasurespositioninthevertical
axis.Thiswillbeusuallyonlybethecaseforreal-timekinematicGPSsystems
andsomeopticalpositioningsystems.
2Measurethehorizontallocationofthepositioningsystemantenna’swithan
accuracyof±5cmor20%ofthepositioningsystem’saccuracy.
Waterline
Note
Withthevesselinnormaltrim,thatiswithanindicatedpitchangleofzerofromthe
motionsensor,thedistancetothewaterlinemaybemeasuredanywhereonthevessel,
butotherwiseitmustbemeasuredatthealongshipphysicallocationofthemotion
sensor.Themeasurementshouldbetakenonbothsidesofthevesselandaveragedto
removeanyrolleffects.Simultaneousmeasurementsarerequiredifthevesselismoving.
1Measuretheverticaldistancetothewaterlinewithanaccuracyof±2cm.
Transducerorientation
TheMS70transducerarrayisequippedwithindexmarkstobeusedformeasuring
itsorientation.Arulerorientedwiththefaceindexmarkscanbeusedtogivethe
headingandpitchofthearray.Bymakingtherulerasaright-anglecrosstherollmay
bemeasured.
331549/B
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