Technical information

SimradEK60
•Minimumlevel-100dB(chosentogiveareasonablepingrate)
•Maximumlevel-64dB
11Right-clickintheEchogramview,andselectRangeontheshort-cutmenutoopen
theSurfaceRangedialog.
12Setthefollowingparameters:
•Startrelativesurface:0m
•Selectarangethatwillprovideanoiserecordingwithatleasttwoorthree
coloursontheechogram.
13Right-clickintheEchogramview,andselectBottomDetectionontheshort-cut
menutoopentheBottomDetectiondialog.
14Setthefollowingparameters:
•Bottomdetection=0.0m
•Thisdisablesthebottomdetectionalgorithm.Thisalgorithmreducestheping
rateinpassivemode,anditisnotrequired.
15ClickOutput→File,andobservethattheFileOutputdialogopens.
16Setthefollowingparameters:
•Samerangeasintheechogram
•0Mbmaximumlesize
17Starttheechosounder.
Increasingspeed
Procedure
1Startthetestloopwithvesselspeed0knots.
2Makeashortechogramrecording,ndthenoiselevelintheNumericalview,and
notedownthevalues.
3Increasethevesselspeedwith1or2knots,andwaituntilthespeedisstable.
4Repeattheloopuntilthevesselhasreachedmaximumspeed.
Decreasingspeed
Procedure
1Startwithmaximumvesselspeed.
2Startechogramrecording
3Disengagethepropellerasquicklyaspossibletoallowthevesseltoslowdown
byitself.
4Usetheannotationoreventfeaturestotageach1or2knotsspeeddecrease.
5Stoptheechogramrecordingoncethevesselhasstopped.
Ifthenoisedecreasesquicklytowardsthesamelevelasat0knotswhenthepropeller
hasbeendisengaged,thismeansthatthepropellermainlygeneratesthenoise.Ifthe
noiseatdecreasingvesselspeedismoreorlessequaltothenoiselevelatincreasing
speed,thenoiseisprobableow-noise.Usuallythenoiseisacombinationofboth.
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