B&G H2000 Pilot *DISCONTINUED* - Manual (Page 214)

h2000 User Manual
214 HB-0845-06
(c) Poorly located transducer. Determine what conditions cause
the problem by doing some manoeuvring trials in an area which
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 made when travelling 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;
however 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 0m 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.