
CVR–010
Advanced Settings
55
8.10.4. Selecting Echo Dynamic Ranges
8.10.4.1.
Introduction
Figure 8-23 Initial Echo Dynamic Range
・
Echoes are displayed using up to seven
different colors, depending on their
strengths.
・
The colors that are currently used to show
echoes are indicated in the form of a color
scale at the screen’s left edge, with the
top color (initially blue) and bottom end
colors (initially red) representing the
weakest echoes and strongest echoes,
respectively.
・
The echo dynamic range refers to how
much change in echo strength must occur
before an echo can be displayed in
adjacent stronger or weaker color.
・
The following selectable dynamic ranges:
3 dB, 4 dB, 5 dB and 6 dB.
・
Selecting a greater dynamic range will
require a greater change in strength for
an echo to be displayed in a next strong
color.
-
3
dB:
initial setting
, suitable for working over soft grounds where the bottom echo shows
in weak colors. This dynamic range will cause otherwise weak echoes to show in
strong colors. Successful bottom tracking and digital depth readout requires the
bottom echo to be displayed in red or orange (or user–assigned colors). A 3–dB
change represents a change of approx. 1.4 times in strength.
-
4
dB:
optional setting, a compromise between 3 and 6 dB. A 4–dB change represents a
change of approx. 1.6 times in strength.
-
5
dB:
optional setting, suitable for operation at mid and greater depths or over hard
grounds. If you experience situations where otherwise weak echoes, such as air
bubbles and plankton concentrations, show up in stronger colors at normal gain
settings, try this range or 6 dB. A 5–dB change represents a change of approx. 1.8
times in strength.
-
6
dB:
optional setting. Try this if 5 dB setting still produces majority of echoes in strong
colors. A 6–dB change represents a change of approx.
2
times in strength.
NOTE: The above information does not apply when the echo display is set to show only the bottom contour
in a single color ( initially red ). To display echoes in full colors, see instructions given in paragraph 8.9.
・
The following instructions will allow you to select the value that best suits your needs.
8.10.4.2.
Dynamic Range Selection Procedure
Figure
8-24
DYNAMIC RANGE
Submenu
(1) Select
“
3:DYNAMIC RANGE
” by pressing
,
opening the
DYNAMIC RANGE
submenu.
(2) Select the desired range by pressing the
appropriate numeric key.
(3) Press
to complete the selection, and
.
3 dB
3 dB
3 dB
3 dB
3 dB
3 dB
Weakest
Strongest
3:DYNAMIC RANGE
1 : 3 d B
2 : 4 d B
3 : 5 d B
4 : 6 d B
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