B&G Hydra 2000, Руководство пользователя

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Hydra 2000 User Manual
Part 6 - Diagnostic Data
HB-0844-02
6-9
made when traveling in a straight line. Then repeat the
tests when turning to port and starboard. If better results
can be obtained when turning it is possible that there is
something in front of the transducer causing aeration.
This may be a hull fitting like a water outlet in which case
the transducer or the hull fitting should be moved. If there
seems little difference whether turning or not, the
position of the transducer should be reviewed. It may be
coming out of the water at high speed or in rough water.
It is impossible to give specific instructions on where to
re-site the transducer as it is so dependent on the design
of boat. Generally, better results will be obtained nearer
the centre line of the boat. If there is only a problem
when heeled, consider fitting two transducers with a
changeover switch.
6.3.3 Consistently Shows Shallow Depth
Symptom : Display consistently shows a shallow depth between
0 and about 1.5m.
Possible causes:
(a) Faulty transducer. Transducer rings for too long after
the transmit pulse is sent and the ringing is interpreted as
a shallow return by the depth sounder. On a deep keeled
yacht it may be possible to overcome this problem by
increasing the minimum depth to just less than the draft of
the yacht. The minimum depth is adjusted by changing
CAL VAL1 on NOISE.
PARAMTR
→
NOISE, CALBRATE
→
CAL VAL1 ( MIN DPTH M )
The default setting for minimum depth is 0.7 metres.
(b) Keel echoes. If the transducer has been installed too
close to the keel it is possible to get consistent echoes
from the keel. The transducer should be re-sited further
away from the keel. If this is impossible then increasing
the minimum depth to just below the keel can solve the
problem but may result in poor performance when the
bottom is shaded by the keel. Marginal cases are