Owner's manual

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Page56
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NAV440UserManual
7430‐0131‐01Rev.F
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Aftercompletingthealignmentprocedure,theheadingaccuracyshouldbeverifiedwithallthirdpartysystems
activelyusingaknownreferencesuchasacompassrose,GPStrackoracalibratedcompass.Headinginaccuracies
greaterthanthevaluesspecifiedonthedatasheetorfluctuatingheadingperformancemayindicatemagneticfield
disturb
ancesneartheunit.
NOTE:AnacceptablecalibrationwillprovideXandYHardIronOffsetValuesof<0.1andaSoftIronRatio>0.95.If
thisproceduregeneratescalibrationparameterssignificantlyoutsideofthisrange,thesystemwillassertthe
softwareErrorÆdataErrorÆmagAlignOutOfBoundserrorflag.RefertoError!Referencesourcenot
found.
BuiltInTest(BIT)fordetailsabouterrorflaghandling.
Formoreinformationaboutmagnetism,includinghardironandsoftironeffects,refertoChapter4.Magnetometer
alibrationandAlignmentGuidelines
onpage39.
C
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NOTE:Thealignmentdoesnotcorrectfortimevaryingfields,orfieldscreatedbyferrousmaterialthatmoveswith
respecttotheunit.
AlignmentInstructions
NOTE:The440Seriesdoesnotsupportexternalmagnetometers;aligningorlevelinganexternalmagnetometer
doesnotapplytoa440Seriesunit.
1. ClickConfigurationandthenselect
MagnetometerAlignment
fr dropomthe
menu.
2. The
MagnetometerAlignmentdialog


windowopens.Ensure
InternalMagis
selected.
3. Ifthe360degreeturncanbecompleted
within120seconds,checkAuto
e
Terminat
.
4. Selectthe
Startbuttontobeginthe
alignment.Followtheinstructions
displayedinthescreen.RefertoFigure19.
5. Rotatetheunitfor380degreesofrotation
oruntilthemessageisdisplayedthat
alignmentiscomplete.
Figure19MagnetometerAlignmentDialog
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