Koden CVS-841 - Page 107

Chapter 8 CVS-841/851
Trouble Shooting
8-4 93132682-01
A Scope
2002/02/13 (Wed)
14:22:56
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Bottom depth indication
Bottom detection
threshold window
(High Freq)
(3) Bottom detection threshold is
appropriately set
(1) Setting too low (Approx –80).
A school of fish is mistakenly
detected as a bottom.
(2) Setting too high (Approx 40)
A bottom is not detected.
(4) Set the threshold curve to be
tangential with the bottom echo.
The threshold curve obtained
by reducing the threshold
level by 6.
Figure 8.1 Setting the bottom detection threshold