B&G Hydra 2000, User Manual

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Hydra 2000 User Manual
Part 6 - Diagnostic Data
HB-0844-02
6-8
it making sure no air bubbles are trapped in the paint. The
cable should be checked for damage. The resistance
between the orange/green cores should be in the region
of 0.5 to 5 Ohms and resistance between the screen and
the cores should be infinity.
Resistance measurements should only be made with the
transducer disconnected from the Processor Unit.
(e) The gain of the receiver has been set too low. It is
possible to adjust the maximum gain via CAL VAL1 on
gain. This is normally set to 30 and should not be
adjusted.
6.3.2 Yacht Moving
Symptom : Display shows (Floating Bars) when yacht is moving:
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- -
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This is most often an indication of difficult sounding conditions,
but can also indicate a badly positioned transducer.
Possible Causes:
(a) Difficult sounding conditions and or depth sounder
unable to track rapidly changing bottom. If coming into
shallow water yacht should slow down and proceed with
caution.
(b) Aeration in the water, most often caused by the wake
of another vessel. This can persist in the water for a long
period after the passing of the vessel. In some instances
the depth sounder will indicate the depth of the aeration
layer caused by a large vessel.
(c) Poorly sited transducer. Determine what conditions
cause the problem by doing some manoeuvring trials in
an area that has a relatively uniform depth, a solid bottom
and is clear of the wake from other boats. First determine
the maximum speed at which reliable soundings can be