CVS-833/833C
Chapter 5
Basic Operation
Chapter 5 Basic Operation
5.1 Introduction
In this chapter, all necessary operating instructions are given from getting started to turning off the
system. The following panel layout illustration will give you an idea what sort of key switches and
controls are available as well as their brief functional descriptions.
5.2 Theory of fish finder operation
The color fish finder CVS-833/833C is composed of a display unit with a transmitter/receiver and a
transducer unit. Various transducer types are available according to the frequency, with or without
temperature and speed sensors, etc.
The transmitter/receiver section produces a driving pulse, which is sent to the transducer to transmit
ultrasonic sound energy to the ocean. The transmitted energy hits the school of fish or sea bottom and
bounces back following the same path to the transducer. The received signals are converted to
electrical signals and subject to signal processing to allow a color presentation on the Liquid Crystal
Display (LCD). When the ship moves from Point A to Point B, the ultrasonic sound energy scans past
the ocean as shown in Figure 5.2. Figure 5.3 shows a sectional view of the sea bottom. Figure 5.1
shows an example of the image presentation on the screen, where the latest echoes are supplied from
the furthest right side of the screen and move to the left.
School of fish
NOTE: Darker part
shows the reflection is
stronger than others.
Sea bottom
Sea surface
Reflection from sea surface
Figure 5.1 Typical echo presentations on the screen
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