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406273/C

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

Simrad ES80 User Manual

Questions and Answers: