Simrad PI GEOMETRY - QUICK REFERENCE GUIDE REV B Manuale di Installazione Pagina 45

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Operationalprocedures
HowtoadjusttheTVG
TheTVG(TimeV ariedGain)controlsthegaininthesignal
amplier.Thegainisweakestjustaftertheping,andincreases
inaccordancewithtime(andthereforerange).Anumberof
standardgaincurvesareavailable,aswellasOff.ByusingTVG,
thegainisadjustedinsuchwaythataschoolofshwillbe
presentedwithapproximatelythesamestrengthonthescreenin
anypositioninsidetheregulatedTVGrangeof1000meters.
1ClicktheHorizontalorVerticaltabtoopentherespective
menu.
2ClickTVGtoadjusttheparameter.
ClicktheleftorrightsideoftheTVGbuttontochoosea
setting,orthemiddleofthebuttontoopentheparameter
dialog.
Formoreinformationaboutthisparameter,seeWhatisTVG?
onpage178.
Howtoadjustthedisplaygain
TheDisplayGainincreasesordecreasesthestrengthoftheecho
presentationonthedisplay.
1ClicktheDisplaytabtoopentheDisplaymenu.
2ClicktheDisplaygainbuttontoadjusttheparameter.
ClicktheleftorrightsideoftheDisplaygainbuttonto
decreaseorincreasethesetting,orthemiddleofthebutton
toopentheparameterdialog.
Modeprocedures
Thissectionexplainshowtochooseoperationalmodes,andhow
tosetuptheModebuttonsontheSH90OperatingUnit.
ThevariousmodesaredescribedinchapterDisplaymodeson
page68.
Howtoselectoperationalmode
YourSH90sonarisequippedwithseveraloperationalmodes.
Observetheseprocedurestochoosethemodebesttforyour
currentoperations.
1LocatetheModeeldonyourOperatingPanel
323775/B
43
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