B&G Hydra 2000, Руководство пользователя

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Hydra 2000 User Manual
Part 6 - Diagnostic Data
HB-0844-02
6-10
sometimes caused by side lobes from the main beam
from the transducer and may be cured by rotating the
transducer in the housing.
(c) Following or crossing the path of another vessel
which has left an aerated layer in the water.
6.3.4 Random Deep Depths
Symptom : Display shows random deep depths.
Possible Causes:
(a) Electrical noise. The depth sounder contains circuits
and software to reduce its susceptibility to electrical
noise, however this can still be a problem if not installed
carefully or other equipment is not correctly suppressed.
The depth sounder measures the ambient noise and this
can be found for display by looking under the PARAMTR
Menu. When the boat is stationary electrical equipment
should be switched ON and OFF in turn while looking at
the depth and noise displays to try and determine the
source of the problem.
(b) Acoustic Interference. Other depth sounders and
sonar can cause problems. However this is generally only
when very close to other boats for example when moored
alongside in a crowded marina. Also acoustic noise can
be generated by water flow past the transducer and
various bits of mechanical machinery.
(c) Mid-water echoes. When outside the range of the
depth sounder it is possible that random depths are
displayed due to mid-water echoes from shoals of fish or
aeration layers.