JRC JFE-700, Инструкция по эксплуатации

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4. Operation
4-2
Gain control [GAIN]
・
Gain can be set to 41 stages of 0
～
40.
・
Touch on main screen. The button color change to green and gain menu is displayed.
・ Auto gain mode or manual gain value is displayed with highlight on main screen when gain menu is
displayed.
・
Auto or manual gain mode can be set with each touch.
・ Whenever is touched, the gain value is raised.
・ Whenever is touched, the gain value is lowered.
・
When touch or , , auto gain is canceled automatically and switch to the manual gain.
・
When auto gain mode is canceled, it is operated the gain value at the time of canceling and doesn
’
t return
before the auto gain mode.
・
After setting the gain. touch green GAIN button and gain menu is closed.
・
When 2 transducers are installed, touch the green GAIN button again to switch to the CH2 setting.

About the sensitivity setting
・ Note that improper gain settings may result in incorrect depth measurement.
・
The reflection from sea bottom is different according to the condition of sea bottom. The reflection weakens
like sand and mud, etc. though a strong reflection returns like the bedrock.
・
It becomes impossible to recognize sea bottom when the reflection is weak and the depth value might not be
displayed. For this case, bottom of the sea is displayed in red by raising sensitivity. However, dirt and the
plankton, etc. in the sea are mistaken when sensitivity is raised too much for sea bottom, it recognizes, and a
wrong depth value might be displayed.
・
As for the setting of sensitivity, extent to which sea bottom is displayed by a red or an orange color is proper.
Note
・
When setting to an auto gain, the STC curve becomes
“
LONG" regardless of the setting of STC.
Sensitivity is too low.
When sea bottom is a red or an
orange color, the display
sensitivity is proper.
Sensitivity is too high.