Koden CVR-010, Руководство по эксплуатации

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CVR–010
Basic Operating Instructions
27
7.3.2. Automatic Selection (Automatic Mode of Operation)
･
The equipment is initially in the automatic control ( AUTO ) mode, selecting depth ranges,
adjusting the receiver gain and TVG levels
* 1
(shallow gain suppression level) – all
automatically.
･
The bottom echo will remain displayed in the lower half screen area regardless of
changes in depth.
･
Pressing

will switch the control to the manual mode (
MANUAL )
.
- A second keypress will switch it back to “ AUTO .”
･
The figure below illustrates an example of how depth range selection occurs with this
mode activated, as you travel over a gradually deepening bottom.
･
As soon as the bottom shows up at the lower end of the scale lines on the current depth
range, the next greater range will be automatically selected.
･
When traveling over a gradually shallowing bottom, the range selection sequence is
reversed.
･
As soon as the bottom is registered in the upper half screen, the next smaller range will
be switched in.
*
1
:
TVG: Time–varied gain. This function, which sharply reduces the receiver gain at the start of each sounding and
gradually recovers the normal gain level with time, is used to prevent surface clutters and other noise–producing
reflections near the surface from disturbing depth measuring operation.
Figure 7-15 Automatic Depth Range Selection – Example
･
On–screen status indication “ A U TO ” will be turned on highlighted as in the example
below to indicate that the unit is currently operating in the automatic control mode.
Figure 7-16 On–Screen Indication of Automatic Control Mode
Range D Range C
Range B
Range A
Automatic control mod e