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NAVMAN 8120 Manuel d’installation et d’utilisation96
4-4 Lorsque le bateau se déplace, l’écho
retourné par le fond disparaît de
l’écran ou les valeurs affichées sont
incohérentes :
a L’installation de la sonde est incorrecte.
Veiller à ce que le dessous de la sonde
soitrement incliné par rapport à
la surface de l’eau. La sonde doit être
immergée le plus profondément possible
afin d’éviter la formation de bulles par
cavitation. Pour plus de détails, veuillez
vous reporter à la notice de montage des
capteurs tableau arrière.
b La sonde est installée dans une zone de
turbulences. Les bulles d’air perturbent
les échos, empêchant l’Instrument
de détecter le fond et les cibles. Ce
phénomène se produit fréquemment
lorsque le bateau est en marche arrière. La
sonde doit donc être installée à un endroit
où l’écoulement est laminaire, quelle que
soit la vitesse du bateau.
c Les signaux parasites provenant du
moteur du bateau perturbent le
fonctionnement de l’Instrument. Installer
des bougies antiparasites.
4-5 Deux profils de fond s’affichent à
l’écran :
a Le bateau se trouve au-dessus d’une zone
d’ombre (voir section 8-2).
b Le bateau navigue en eaux peu profondes.
La faible profondeur provoque un
phénomène de double écho. Réduire le
niveau de gain (voir section 8-6) et/ou
l’intensité du signal sonar (voir section
17-3).c Diminuer la valeur de l’Echelle.
96


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