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2. HORIZONTAL MODE
2-49
COLOR RESPONSE…: Adjusts reflected echo strength versus echo color level
for currently selected color response number.
To adjust the curve, place the trackball at the point desired and press the
[MENU] key. On the horizontal axis input level relative value is shown in the
range from 0 to 100%. The setting range for input level is 0-100% in increments
of 10% and output level is 0-100% in any value.
0
10080604020
100
80
60
40
20
H-SCAN COLOR
DEFAULT CANCEL QUIT
To set input level versus output level, use the trackball to
place the trackball mark on location desired and press the
[MENU] key.
DEFAULT: Select to restore default
setting for selected color response.
CANCEL: Select to cancel change.
QUIT: Select to finish.
Currently selected color
Input level scale
Color response curve
GAIN OFFSET: Adjusts gain level. If the front panel [GAIN] control does not
provide satisfactory gain adjustment, enter an offset here. The setting range is
0-12.
SIGNAL LEVEL: Dirty water or reflections from plankton may be painted on the
screen in green or light-blue. These echoes may be erased in order of strength.
The setting range is 0-15.
FAR TVG CURVE: Selects the TVG curve to use. The setting range is
TVG1-TVG4. The higher the setting the sharper the gain curve.
ABSORPTION COEFF: Attenuation of the acoustic pulse underwater varies with
sea area and water temperature. This menu item is provided to offset
absorption; however, the default setting is suitable in most cases. If sensitivity
decreases with distance, increase the absorption coefficient setting. And if it
increases with distance decrease this setting.