Simrad ES80 - Controlling the Gain and Range Settings; Adjusting the Gain (Echo Sensitivity)

406273/C
91
Controllingthegainandrangesettings
Topics
Adjustingthegain(echosensitivity),page91
AdjustingtheTVG(TimeVariableGain)setting,page93
ChoosingRangeandStartRangevaluesinasurfacerelatedechogram,page94
ChoosingRangeandStartRangevaluesinabottomrelatedechogram,page95
Adjustingthegain(echosensitivity)
Youcancomparethisgainsettingwiththevolumecontrolonyourcarradio.When
thegainisincreased,theechoeswillappearstronger.Weakechoeswillbeeasierto
see.However,sinceyoualsoincreasetheacousticnoiseinthereception,theES80
presentationswillalsoshowthisnoise.Toomuchgainmaytherefore"distort"the
presentation.
Context
Comparingthegainfunctionwiththevolumecontrolonyourcarradioisnotvery
accurate.Infact,thegainintheES80isconstant.TheGainfunctionisusedtoadjust
thesensitivity
.Thisdonebycontrollingtheminimumlevelofdetection.Whenyou
increasethegainlevel(morepositivenumber),youreducetheminimumlevel,andthus
increasethesensitivity.
Theechostrength(A)changeswithtime.Theminimumlevelofdetection(B)isadjusted
upordownwiththeGainfunction.IncreasingtheGainwithamorepositivenumber
reducestheminimumlevel,andthisincreasesthesensitivity.Onlyechoesoverthe
minimumlevelareshownintheechogram(C).
Operatingprocedures