
Simrad PI32
158
857-164636 / Rev.A
Depth for fish:
This parameter allows you to define a vertical
depth area (between a maximum and a minimum depth) in
which the fish alarm can be triggered. Echoes outside the chosen
area will not trigger the alarm.
Depth alarm
(minimum and maximum values): This parameter
enables an alarm to sound off if the water depth is shallower or
deeper than two predefined limits.
Transmitter:
This parameter allows you to change the power
output from the echo sounder. You can choose OFF (and no
echogram will appear!), LOW, HIGH or AUTO. In most cases,
select AUTO. The echo sounder will then automatically adjust
the power output depending on the current operational
frequency and the current depth.
Transmit pulse length:
This parameter allows you to choose
the length of the echo sounder pulse transmissions. You can
choose OFF (to observe the ambient sea noise), SHORT,
MEDIUM, LONG or AUTO. In most cases, select AUTO. The
PI32 will then automatically choose the pulse length depending
on your current depth range. If you choose to try a manual
mode, try long pulse lengths when you operate in deeper waters,
and shorter pulses with higher frequency in shallower waters.
As a general rule, short pulses serve to make the echoes from
various objects more distinct. It is therefore used to obtain
optimal vertical resolution, as it will separate individual fishes
from each other and from the bottom. Longer pulses will
penetrate deeper, but with less resolution.
Echo sounder mode
: This parameter allows you to run the echo
sounder in a “demonstration” mode, or to switch it off. When
you select any other mode than NORMAL, the echo sounder
will automatically use a “demo transducer” to avoid damage to
the output circuitry.
Display:
This parameter defines which depth value to be
provided in the echo sounder presentation. You can choose to
see the water depth under the keel, the depth below the
transducer, or the depth from the sea surface. In order to ensure
correct depth readouts, you must make sure that the distances
between the surface and the transducer face and the surface and
the lower part of the keel are defined. See the parameter
descriptions above.
Related topics
→
Echo sounder display, page 40
→
Echo presentation setup, page 154
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