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3. Sensitivity: Automatic Mode- Each time the unit is turned on, the automatic feature is on. In the
automatic
mode the sensitivity is adjusted to give a good return and the correct depth range is
selected. The word Auto will appear in the upper right hand corner of the display any time the unit is
in the automatic mode. The sensitivity bar at the top in the of the screen will increase or decrease
automatically indicating the amount of sensitivity being used. In deeper water or soft bottom
conditions this bar will increase indicating more sensitivity. In shallow water or when a hard bottom
is being read, the sensitivity needed to achieve a good return will be less. Also in the automatic
mode, the unit will black out the display beneath the bottom line.
Manual Mode- There are two ways of putting the LCR 2000 in the manual mode: (1) depress the Auto
"On/Off" button or (2) depress either the manual decrease (-) or increase (+) button. You will notice that
the word "Auto" in the upper right hand corner of the display has gone off. The operator can control the
amount of sensitivity by depressing the (+) or (-) button. There are 15 sensitivity settings. When the (+)
or (-) button is pressed once, the sensitivity setting at the top of the screen will change by one division.
If the (+) or (-) button is held down the setting will move up or down as long as the button is held down.
When the maximum or minimum setting is achieved, the unit will make a "Chirping" sound indicating a
limit has been reached.
In the Manual mode everything below the bottom is no longer blackened out, therefore a second return
or double echo can be displayed if desired. Also, the hardness of the bottom can be determined by the
thickness of the bottom return. For example, a hard or rock bottom will give a wider bottom return as
compared to a soft or muddy bottom.
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