
References
155
857-164636 / Rev.A
TVG
(Time Varying Gain): The PI32 provides a TVG function
to enhance the echoes from deeper waters. You can select either
Bottom (20 log R) or Fish (40 log R) setting, depending on
which echoes you wish to enhance.
Sound speed
: This parameter allows you to fine tune the
performance of the PI32 echo sounder to the speed of sound in
the water. However, in most cases, the speed is not known, and
this parameter is not important at all when operating in shallow
waters. For all practical purposes, leave this setting to the
default value of 1470 m/s.
Ping to ping filter
: This function employs a filter which
compares the echo information from one ping with the
information from the previous ping. This will “clean up” the
echogram by removing random noise spikes and interference
with no correlation with the previous echo. The function will
thus make the echoes appear more stable. You can switch this
filter on or off.
Signal threshold
: This is an on/off function. When activated, it
will remove the weakest echoes from the screen. The threshold
level is automatic. Activate with caution, as it may remove
small fish or other weak unidentified echoes from the
presentation.
Colour threshold
: This function allows you to choose the
number of colours to use for echogram presentation. By
switching this filter on and selecting a colour in the box, all
echo colours “below” the chosen colour will not be shown in the
echogram. You can thus regard this as an “echo threshold”
which will remove the weakest echoes.
Depth grid
: When this function is enabled, thin horisontal depth
lines will be added to the echogram to easier identify the depth
intervals. When you operate with a graphic display, this function
can also be switched on and off in the
Graphic
setup.
Scroll speed:
This function controls how fast the presentation
shall scroll from right to left across the display. By defining this
speed you also control the time scale. If you slow down the
scroll speed, you will also increase the time between each echo
sounder transmission (ping). If you choose FREEZE the
presentation (and also the echo sounder transmissions) will stop
altogether. Note that this parameter can also be set in the
Graphic setup
.
Echo sounder frequency:
This function allows you to choose
echo sounder operating frequency. Use the high frequency for
shallow waters, and the low frequency for deeper waters.
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