117
Reference section 6 — Echo sounding
The picture menu
Reference Manual Revision D
read lower or higher than the uncalibrated
value.
NOTE:
You
must
enable the speed setting under
the Data menu on the
ECHO SOUNDER
screen.
Temperature is calibrated by entering the
temperature error as a number of degrees
from –99 to +99. This offset is added to the
uncalibrated temperature before it is
displayed or graphed.
The picture menu
You can adjust the appearance of echoes in
five different ways:
•
gain (for high intensity echoes)
•
clutter (for low intensity echoes)
•
noise limiter (for interference)
•
hue (to choose colors and white level)
•
signal level (to remove weak echoes)
Gain and clutter changes are applied only
to new echoes as they appear on the right
side of the screen—earlier echoes are not
affected.
NOTE:
When you override the gain’s automatic
settings, the tabs on the
Picture
key and
Auto
key change from green to yellow,
indicating the system is no longer in auto-
matic mode. When you turn the noise
limiter on, only the
Picture
key tab
changes from green to yellow. Changing
the hue or adjusting the signal level has
no effect on the operating mode (the tabs
remain green).
Adjusting the gain (strong echoes)
The
gain
setting selects the echo strengths
that will be displayed using the
topmost
color in the color bar at the left edge of the
screen (the
strongest
echoes). Any echoes
stronger than this selection will use the
same color and no detail can be distin-
guished. The gain is usually set so that
strong seabed echoes are displayed in
brown, the strongest level.
The gain can be also be set automatically
by pressing
Auto
. This provides an excel-
lent picture under most conditions, and
allows the 490 to reliably detect the seabed
depth.
Gain is normally adjusted together with
clutter
, as described on the next page.
To adjust the gain:
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Страница 46: ...42 Reference section 1 Using the Chart Screen Using the distance and bearing calculator Northstar 6000i ...
Страница 88: ...84 Reference section 4 Creating waypoints and routes Transferring waypoints to and from a PC Northstar 6000i ...
Страница 106: ...102 Reference section 5 Radar Using the Radar Markers keys Northstar 6000i ...
Страница 139: ...135 Reference Manual Revision D Reference section 7 Video Video sources 136 Displaying video 136 ...
Страница 141: ...137 Reference Manual Revision D Reference section 8 Alarms and TideTrack Alarms 138 TideTrack 146 ...
Страница 153: ...149 Reference Manual Revision D Reference section 9 N2 Networking General information 150 Restrictions 150 ...
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