Technical Manual LAZ 5100 / ES 5100
OPERATING INSTRUCTIONS
4-6
Technical Manual LAZ 5100 / ES 5100
TH 52 603 8001 EN Rev.: S
4.4
Altering System Parameters and Settings
When the system is switched OFF, parameters selected are stored in the system's
memory. When the system is switched ON again, these parameters will be retrieved
and used (see NOTE below).
The "DIM" setting is not stored; a pre-set default setting is used when the
system is switched ON. With two channel systems, channel 1 is the default
channel at start-up.
4.4.1
GAIN, RANGE and DIM Settings
GAIN
(amplification),
RANGE
(depth range) and
DIM
(display area background
lighting and keypad
illumination) settings are made by pressing the relevant keys.
There are two keys for each setting, one marked with an arrow pointing upwards and
one marked with an arrow pointing downwards. Pressing these keys as described
below will alter the present setting. The new setting will appear briefly on the display
area directly above the key which was pressed and the effects of a change can be
observed directly on the display area. Pressing the key a second time will alter the
setting by a further unit.
4.4.1.1
GAIN Settings
The unit is fitted with an automatic gain control circuit for the data processing which is
always activated when the unit is switched on. The
GAIN
setting
only influences the
displayed echo information. The
GAIN
value can be altered between 1 and 10,
whereby 1 is the lowest and 10 the highest gain (amplification) factor.
If the sea bed trace appears too weak, the
GAIN
level must be increased to give a
clear presentation. If there is a lot of "noise" to be seen on the display area, the
GAIN
level must be decreased.
To
increase
the GAIN level, press the
GAIN key
. To
decrease
the
GAIN
level,
press the
GAIN key
.
The set value will appear on the display area above the key (between 1 and 10).
Pressing the same key a second time will increase or decrease the value by one
further unit. Repeat the procedure until a satisfactory sea bed trace is achieved.
In some cases it can be useful to work with manual instead of automatic gain. Manual
gain setting is explained in chapter 4.5.2.5.
