CA4
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Chapter 8
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the distance. To do so, place the VRM ring on top of the object and
check the readout in the control panel (follow procedure in sec. 8.2.5).
If the readout is not the same as the known distance, adjust the value in
Zero range with 1 figure up/down for every 3 meter adjustment.
Sensitivity
is preset to 048. Adjust value if echoes are not reasonable
clear i.e. the higher the value, the less detailed presentation of echoes.
GZ target threshold
: is preset to 5. Objects are identified according to
weak/strong signals. 1= weakest, 7= strongest.
Auto sea
and
Auto gain
settings i.e. Minimum, Default, Maximum:
If necessary, the factory presets can be adjusted (0 to 255) to improve
the clarity of the echoes. After the adjustment, the new values will be
the new AUTO settings. Preset parameters can only be adjusted from
X-MIT mode
after correct scanner type, etc. has been selected and
Stretch mode is left in off position (Gain must be adjusted before Sea)
:
•
Auto gain values
To adjust the preset values, you first have to:
1. Adjust Rain to minimum acceptable value: move cursor to the
‘Rain’ bar, and adjust with +/- keys.
2. Adjust Sea to minimum acceptable value: move cursor to the ‘Sea’
bar, and adjust with +/- keys.
3. Set ‘Tune’ bar to ‘AUTO’ mode: move cursor to the ‘Tune’ bar
and press [CLR].
4. Choose a displayed range of 3nm (press key [4]) or higher.
Now you are ready to adjust the Auto Gain values in the last three lines
of the Radar setup display:
Auto gain minimum (factory value 080): Adjust to optimum radar
image - fairly clear targets and no noise.*
Auto gain default (factory value 090): Adjust to best picture.*
Auto gain maximum (factory value 105): Adjust to maximum
allowable level of noise.*
*) wait for screen to update to see the result of adjustment.
Auto
Gain
adjustment bar
AUTO
Level:
080
090
105
