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8120 Installatie- en bedieningshandleiding95
4-4 De Bodemecho verdwijnt of de
weergave is foutief wanneer de boot
beweegt.
a Verzekert u zich ervan dat het achterste
deel van de onderkant van de transducer
lager is dan de voorkant en dat de
voorkant zich zo diep mogelijk in het
water bevindt, om ervoor te zorgen dat
cavitatie zo weinig mogelijk belletjes
veroorzaakt. (Zie de Installatiegids
Spiegeltransducers, voor meer informatie.)
b De transducer bevindt zich misschien
in turbulent water. Luchtbelletjes in het
water verstoren de weerkaatste echo’s en
storen het instrument bij het vinden van
de bodem of andere doelen. Dit gebeurt
vaak wanneer achteruit wordt gevaren.
De transducer dient ergens bevestigd te
zijn waar het water er rustig langs stroomt
om het instrument bij alle bootsnelheden
goed te doen functioneren.
c Elektrische storing van de motor van de
boot kan met het instrument interfereren.
Probeer ontstoringsbougies.
4-5 Er wordt een dubbel bodemtracé
weergegeven:
a De boot bevindt zich misschien in een
gebied dat schaduw veroorzaakt (zie
paragraaf 9-2).
b In ondiep water kunnen echo’s
terugkaatsen. Verklein de toename-
instelling (zie paragraaf 9-6) en/of verklein
de sterkte van het sonarsignaal (zie
paragraaf 17-3).
c Verklein het Bereik.
95


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