Simrad EK15 - Page 158

SimradEK15
Tip
Thelengthofyourtransmittedpulseisveryimportanttohowyoucandetectsh.
•Ashortpulsedurationgivesyouaveryneverticalresolution.Thisallowsyou
todetectscatteredsh,andyoucanndthosethatmovenearthebottom.
•Alongpulsedurationthrowsalotmoreenergyintothewater,andthedigital
ltersusedbythereceiverarenarrower.Thelongerpulsedurationwillprovide
longerrange,butreducedverticalresolution.
TheselterswillreducetheEK15'ssensitivityfornoise,butthelengthofthe
transmittedpulsewillgiveyoustrongerechoes.Withthelters,alongerpulse
durationwillprovidelongerrange,butreducedverticalresolution.
ThesearetheavailablepulsedurationsfortheEK15.
200kHz:
80µs160µs320µs640µs1280µs
4Power
OntheEK15,thepoweroutputisxed,andyouarenotpermittedtoadjustit.
5Depth
Thisisthedepthofthetransducerfacerelativetothewatersurface.
Inordertomeasurecorrectwaterdepth,theEK15needstoknowthevertical
distancebetweenthevessel’swaterlineandtheacousticfaceofeachtransducer.
Thedepthofeachindividualtransducermustbedenedmanually.Enterthedepth
asapositivenumber.
ThisparameterisonlyvalidwhentheEK15andanumberoftransceiversand
transducersareusedonavessel.
Example20Transducerdepth
Ifthedistancefromthewaterlineanddowntothetransducerfaceis3,5
meters,enter+3,5m.
6Sequentialpinging
TheSequentialpingingfunctioncanbeusedifyouhavemorethanone
transceiver/transducerinuseontheEK15system.Whenactivated,eachindividual
transceiverwill‘ping’insequence,onebyone.Whennotactivated,alltransceivers
will‘ping’simultaneously.
Tip
TheSequentialpingingfunctioncanbeveryusefulifyourtransducersarelocatedin
suchamannerthatinterferenceisaproblem.
Relatedprocedures
•Choosingpassivemodeofoperationonpage78
•Adjustingthepulseduration(length)onpage78
156
351718/C