Furuno GP-1640F, Руководство оператора, Страница: 24 / 108

2-8
2.10 Erasing Weak Echoes
Dirty water or reflections from plankton may be
appeared on the display with small dots. These
weak echoes may be erased as follows:
1. Press the [MENU] key and the SOUNDER
SETUP OPTIONS soft key.
2. Select SIGNAL LEVEL, and press the EDIT
soft key to show the signal level window.
SIG LVL
OFF
SL1
SL2
Signal level window
3. Press ▲ or ▼ to select level of erasure;
OFF or signal level SL1 or SL3. The higher
the number the stronger the echo will be
erased.
4. Press the RETURN soft key and the
[SNDR] key to finish.
2.11 Selecting Picture
Advance Speed
The picture advance speed determines how
quickly the vertical scan lines run across the
screen. When selecting a picture advance
speed, keep in mind that a fast advance speed
will expand the size of the fish school
horizontally on the screen and a slow advance
speed will contract it.
1. Press the [MENU] key and the SOUNDER
SETUP OPTIONS soft key.
2. Select PICTURE ADVANCE, and press the
EDIT soft key to open the picture advance
window.
PICTURE ADVANCE
2/1
1/1
1/2
1/4
1/8
STOP
Picture advance window
The fractions in the window denote number of
scan lines produced per transmission. For
example, 1/8 means one scan line is produced
every eight transmissions. STOP freezes the
display and it is convenient for observing an
echo.
3. Press
▲ or ▼ to select speed desired.
4. Press the RETURN soft key and the
[SNDR] key to finish.