Simrad SH90 - REV A, Руководство оператора

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Operational procedures
4 Click
Close
to exit.
Gain adjustment procedures
This section explains how to control the manual and automatic
gain settings on the SH90 sonar.
How to adjust the gain
You can adjust the sonar gain by means of the control buttons
on the Operating Panel, or by using the
Gain
button on the
Horizontal
and
Vertical
menus.
1 On the Operating Panel, locate the
Gain
field.
2 Press the
Gain H+
or
Gain H-
buttons to increase or decrease
the gain in the horizontal presentation.
Gain
H-
Gain
H+
3 Press the
Gain V+
or
Gain V-
buttons to increase or decrease
the gain in the vertical presentation.
Gain
V-
Gain
V+
Alternative method
1 In the sonar’s menu system, click the
Gain
button on the
Horizontal
or
Vertical
menus to adjust the gain.
Click the left or right side of the
Gain
button to decrease or
increase the gain, or the middle of the button to open the
parameter dialog.
For more information about this parameter, see About Gain on
page 69.
How to adjust the AGC
The
AGC
(Automatic Gain Control) adjusts the gain in the
sonar’s preamplifier circuitry. This gain depends on the strength
of the incoming echo signal. The result is a filter effect, reducing
noise and reverberation. The
AGC
has four different settings.
1 Click the
Horizontal
or
Vertical
tab to open the respective
menu.
2 Click the
AGC
button to adjust the parameter.
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