Bedienungsanleitung Lowrance X-50 (Seite 12 von 24) (Englisch)

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Automatic

Sensitivity

KEEL OFFSET'

When the X-50 is in the automatic

mode,

the

sensitivity

of the

receiver

will

adjusted

above the minimum

required

pick up

the bottom

signal.

This enables the X-50 to

display

fish, structure,

and other small

targets

while in the automatic mode.

The

sensitivity

level can

changed

while the X-50 is in the automatic

mode. This

may

desirable if the level of

sensitivity

chosen

the X-50 is

not

enough

to show fish

or other small detail. If

desired,

any

amount of

sensitivity up

to the

maximum

may

be added or

any

amount of

sensitivity

down to the minimum

may

be subtracted from the current

setting.

adjust

the

sensitivity

while the X-50 is in

the automatic

mode,

simply press

either the

right

arrow

key>

to increase the

sensitivity

or the

left arrow

key

C to decrease it.

Holding

the

keys

down will

increase or

decrease the

sensitivity

faster. If

the value

goes

below the

minimum,

the

X-50's audible tone will "flutter". The same is true if

you try

above the

maximum level. As

you press

the arrow

key,

the

sensitivity

bar will

move

right

left,

according

to the amount of

sensitivity

chosen. The X-50 will

still

automatically adjust

the

sensitivity

as conditions

change,

but it will

always keep

the

amount

that

you

added or subtracted.

Most sailboats have a keel or a centerboard that

extends

many

feet

below the surface.

Many power

boats with

displacement

hulls also extend

many

feet below the surface of the water. The

digital

sonar

calculates the

bottom

depth

from the transducer's face. If the boat hull sticks below the

transducer,

then it can run

aground

when the

digital says

there is still

clearance. The X-50

provides

a keel offset

adjustment

that allows for the

depth

correction between the face

of the transducer and the bottom of the

hull. For

example,

if the bottom of the hull is

feet

deeper

than the trans-

ducer

location,

then the keel offset

on the X-50 can be

adjusted by press-

ing

17 from the menu selection. A new menu

will

appear:

KEEL

OFFSET IS

0.0 FT

ENTER

VALUE

IN TENTHS

THEN PRESS

Sensitivity—Manual

Operation

times,

may

be desirable to turn the

automatic functions off and

"fine tune" the X-50 to

the current conditions.

manually adjust

the

sensitivity, press

the

AUTO

key

once,

and auto

sensitivity

will be turned

off. The word AUTO at the

top

the

display

will

disappear, signifying

that the X-50 is in the

manual mode. The

sensitivity

can now be

adjusted

the desired level.

Figure

6 demonstrates a

graph

with too little

sensitivity,

while on the

right,

the

sensitivity

adjusted

properly;

a fish is now

visible,

the surface

clutter is more

pronounced,

and the bottom

signal

has widened.

When the horizontal bar reaches the far

right

hand side of the

screen,

the

sensitivity

level is at maximum. If

high

sensitivity settings

are

used,

second bottom echo

may appear.

This is normal and is caused

the

returning

signal reflecting

off the surface of the

water,

making

a second

trip

to the

bottom and back

again.

This is

called "second echo".

Occasionally,

when

high sensitivity

levels

are

used,

the

display

will

turn black.

This

happens

when there are

large

amounts of

surface

clutter,

thermoclines,

turbulent

water,

suspended particles

such as silt that

reflect the sonar

signal.

This does not

damage

the

unit

correct

it,

simply

turn down the

sensitMty

level.

return

the Automatic

mode,

press

the AUTO

key. Remember,

both automatic

sensitMty

control and auto

ranging

functions are

turned off

and on

by pressing

the AUTO

key.

UPPER

LIMIT FOR

NEGATIVE

OFFSET

LOWER

LIMIT FOR

POSITIVE

OFFSET

Since the hull in our

example

boat is 4 feet

lower than the

transducer,

we want to use a

negative

offset.

So,

while

the above menu is still on the

screen,

press

40. This is

actually

4.0 feet.

(If you just press 4,

the offset will

be .4 or four tenths of a

foot.)

The X-50 will now

display

the

depth

with a

four foot offset In other

words,

if the bottom is

fifty

feet from

the transducer

face,

with a four foot

negative

offset the X-50 will

display

the bottom

depth

as 46 feet

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