VDO Logic Log Depth Montageanleitung Und Bedienungsanleitung Seite 85

Other causes may be the reason for a bottom echo not being correctly
received or evaluated:
- The maximum measuring depth of 150 meter has been exceeded;
- The bottom has very strong and dense growth (seaweed);
- The bottom is covered by a thick layer of mud;
- Water layers of different salinity or different temperature, for in-
stance at estuaries or sewage treatment plants;
- Fish or school of fish;
- Preceding vessels or backing manoeuvres aerated the water;
- Strong electromagnetic disturbances, such as refrigerators, mo-
tors, radio equipment;
- Vessels close to each other also operating their echosounders;
- The speed of the ship (gliding) can affect the measurement.
These examples show that it is not possible to correct all problems by
optimum installation and sensitivity selection.
These examples show that it is not possible to correct all
problems by optimum installation and sensitivity selection.
TROUBLE SHOOTING
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