Echo Sounder-How It Works - Koden CVS-118Mk II Operation Manual

Echo sounder - How it works-
The echo sounder consists of a display unit and a transducer with specified frequencies (or a
transducer with speed/temperature sensor.)
An electronic pulse signal is generated in the transmitter section of the display unit. When
coupled to the transducer, this signal is converted into an ultrasonic signal and is transmitted
toward the bottom. The signal travels through the water until it strikes an object or the bottom.
It is reflected back, hits the transducer surface, and is reconverted into an electronic signal by the
transducer. Then it is amplified in the receiver section, processed in the main logic section, and
displayed, as an image on a LCD screen. (Figure 3)
When your boat travels from point A to point B as shown in Figure 1, the beam of the
transducer installed on your boat shows a cross-sectional view in the water.
Figure 2 indicates a cutaway view under the water when your boat moves from point A to point B.
The screen shows the latest scan data at its right position.
After the next scan, the previous data is moved to the left
and the latest scan data is shown at the right position.
When your boat moves from point A to point B, the screen
shows the scan data as shown in Figure 3.
Image
This example shows all data sets that may be shown on the screen.
however, shows part of them according to your operation setup.
Time marker
Frequency
AUTO GAIN display
Color bar scale
Event data stored
Present position
Course
Boat speed
Trip mileage
Water temperature
Bottom depth
0093132312/0093132314
Surface
School of fish
Bottom
Figure 3
The actual screen,
Scale
School of fish
A-Scope
Bottom
1