Furuno CSH-7 User Manual
COLOR SCANNING SONAR
MODEL
CSH-7
c
FURUNO ELECTRIC C O., LT D
9-52, Ashihara-cho,
Nishinomiya, Japan 662
Telephone: 0798-65-2111
Telefax: 0798-65-4200
All rights reserved.
Printed in Japan
PUB. No. OME-13020
(DAMI)
CSH-7
.
Your Local Agent/Dealer
FIRST EDITION : MAY 1997
SAFETY INSTRUCTIONS
WARNING
Do not open the equipment.
Hazardous voltage which can
cause electrical shock, burn or
serious injury exists inside the
equipment. Only qualified
personnel should work inside
the equipment.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury
can result.
Turn off the power immediately if water
leaks into the equipment or the equipment is emitting smoke or fire.
Continued use of the equipment can cause
fire or electrical shock.
CAUTION
Use the proper fuse.
Use of a wrong fuse can result in fire or
permanent equipment damage.
Do not use the equipment for other than
its intended purpose.
Personal injury can result if the equipment
is used as a chair or stepping stool, for
example.
Do not place objects on the top of the
equipment.
The equipment can overheat or personal
injury can result if the object falls.
Do not exceed speed noted in the specifications when operating the equipment
or lowering or raising the transducer.
Do not place liquid-filled containers on
the top of the equipment.
Fire or electrical shock can result if a
liquid spills into the equipment.
Do not operate the equipment with wet
hands.
Electrical shock can result.
Keep heater away from equipment.
Heat can alter equipment shape and melt
the power cord, which can cause fire or
electrical shock.
The transducer may become damaged.
The zinc block attached near the
transducer must be replaced yearly.
The junction between the transducer and
main shaft may corrode, which can result
in loss of the transducer or water leakage
inside the ship.
POSSIBILITY OF INJURY
1. If breaker (hull unit) trips do the
following:
1) Turn off power swich on hull unit.
2) Wait 60 sec after breaker has tripped.
3) Press breaker.
2. Turn off hull unit before using hand
crank.
iiiiiiiiiiiii
i
TABLE OF CONTENTS
FOREWORD
A Word to CSH-7 Owners ........................................................................................................ v
Features..................................................................................................................................... v
System Configuration ..............................................................................................................vi
OPERATIONAL OVERVIEW
Equipment Overview.............................................................................................................1-1
Display Unit Control Panel Description ................................................................................1-2
Turning the Power On/Off .....................................................................................................1-2
Adjusting Screen Brilliance, Control Panel Backlighting .....................................................1-3
Lowering the Transducer.......................................................................................................1-3
Selecting a Display Range.....................................................................................................1-3
Setting the Tilt Angle.............................................................................................................1-3
Adjusting the Gain.................................................................................................................1-7
MARKERS AND DA T A
Standard Markers and Data ...................................................................................................2-1
Optional Markers and Data....................................................................................................2-3
MENU OVERVIEW
Scan Menu Operation ............................................................................................................3-1
Menu-1, Menu-2, System Menu Operation...........................................................................3-4
FINE TUNING THE PICTURE
Eliminating Unwanted Feeble Echoes...................................................................................4-1
Displaying Surface Fish Clearly............................................................................................4-2
Suppressing Seabed Tail ........................................................................................................4-2
Suppressing Seabed and Sea Surface Reflections in Shallow Waters ...................................4-3
Rejecting Sonar Interference and Noise ................................................................................4-4
ADVANCED OPERATION
Measuring the Range and Bearing to a Target.......................................................................5-1
Detecting Fish Schools Aurally .............................................................................................5-1
Relocating Fish School for Easy Observation .......................................................................5-2
Function Keys (F1, F2)..........................................................................................................5-3
Event Markers, Own Ship Event Markers.............................................................................5-5
ii
INTERPRETING THE DISPLAY
Seabed Echoes .......................................................................................................................6-1
Fish Schools...........................................................................................................................6-2
Sea Surface Reflections .........................................................................................................6-3
Wake ......................................................................................................................................6-3
False Echo by Sidelobe..........................................................................................................6-4
Noise and Interference...........................................................................................................6-4
MAINTENANCE
Display Unit Maintenance .....................................................................................................7-1
Hull Unit Maintenance ..........................................................................................................7-2
TROUBLESHOOTING
When the Transducer Cannot be Retracted ...........................................................................8-1
Diagnostic Tests .....................................................................................................................8-3
SPECIFICATIONS.......................................................................................................9-1
iii
FOREWORD
A W ord to CSH-7 Owners
Congratulations on your choice of the FURUNO CSH-7 Color Scanning Sonar. We are
confident you will see why the FURUNO name has become synonymous with quality and
reliability.
For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for quality marine electronics equipment. This dedication to excellence is furthered by our extensive global network of agents and dealers.
This equipment is designed and constructed to meet the rigorous demands of the marine
environment. However, no machine can perform its intended function unless operated and
maintained properly . Please carefully read and follow the recommended procedures for operation and maintenance.
We would appreciate hearing from you, the end-user, about whether we are achieving our
purposes.
Thank you for considering and purchasing FURUNO equipment.
Features
The FURUNO CSH-7 Color Scanning Sonar is a full-circle, multibeam electronic scanning
sonar which detects and instantaneously displays fish schools and underwater conditions in
16 colors on a 10" non-glare, high resolution CRT screen. Its ease of operation, versatility
and compact size make it the perfect match for any class of fishing vessel.
The main features of the CSH-7 are
• Compact size permits installation on smaller fishing boats.
• Vivid 16-color display provides intuitive recognition of seabed and concentration, distribution and volume of fish schools.
• Markers and indications keep the operator abreast of fishing conditions.
• Remote controller (option) provides for armchair control of gain, range and tilt functions.
• New gain, range or tilt setting appears in large characters whenever corresponding control is adjusted.
• Function keys automatically setup the equipment to perform specific task.
• High power MOS FET transmitter ensures reliable operation under any condition.
iv
System Configuration
DISPLAY UNIT
NAVIGATOR
CURRENT INDICATOR
GYROCOMPASS
SPEED LOG
TRANSCEIVER UNIT
CSH-7020
(*)
CSH-7010
REMOTE
CONTROLLER
CSH-7040
(Option)
TILT RANGE
GAIN
RECTIFIER
RU-3424
(Option)
100-115 VAC/
200-230 VAC
1φ, 50/60 Hz
* Interface Module CSH-7050 (option)
required to connect external equipment.
Ship’s Mains
24 VDC
HULL UNIT
600 mm stroke
400 mm stroke
CSH-7030
CSH-7031
v
Equipment Overview
All operations of the CSH-7 are carried out through the display
unit and the remote controller (option). The uncluttered, straightforward control panel of the display unit provides intuitive operation. If you change a control setting you will see the associated
reaction on the display almost immediately.
The handy remote controller provides armchair control of range,
gain and tilt functions.
COLOR SCANNING SONAR CSH-7
OPERATIONAL OVER VIEW
c
– +
TX
d
Control
RANGE
– +
GAIN
TILT
MENU
F1 F2
OFF
CENTER
R
B
EVENT
ON
0
OFF
BRILL
10
DIMMER
AUDIO
panel
TILT RANGE
GAIN
POWER
switch
BRILL
control
DIMMER
Trackball
control
AUDIO
control
Figure 1-1 Display unit, Remote controller
1-1
Display Unit Control Panel Description
Raises, lowers the transducer, respectively. Lamp above a key blinks
while the transducer is moving and lights when it stops.
d
c
– +
RANGE
– +
GAIN
TILT
MENU F1 F2
EVENT
OFF
CENTER
TX
Turns transmitter on/off; freezes the display. The lamp above the switch
lights when the transmitter is turned on and flickers when off.
Selects a picture display range. Also functions to select items on menu
screens. Note that this control turns endlessly in both directions.
Adjusts receiver sensitivity. Adjust for clear presentation of fish echoes.
Also functions to change settings on menu screens.
Tilts the sounding beam between 0° and 55°. The current angle always
appears on the screen.
Opens/closes the menu.
Function keys; execute assigned program when activated.
The lamp above a key lights when function is activated.
Inscribes/deletes an event marker.
R
Draws straight line, called bearing marker, from own ship position toward
B
the trackball marker and simultaneously draws a circle (range marker) with
a radius being the distance between the own ship marker and trackball
marker. Range and bearing data of the intersection of the two markers are
dislayed at the bottom of the screen. To turn off the range and bearing
markers, move the trackball mark near the own ship position and press
the R/B key.
Shifts screen center to cursor location.
Figure 1-2 Control panel description
Turning the Power On/Off
Power on
Press the power switch at the lower left corner of the display
unit to turn the power on/off. When the display unit is turned on
it checks itself for proper operation. (This test is described in
Chapter 8.)
Power off
Press the
above the switch lights and then press the power switch to turn
off the system.
c switch to retract the transducer . Wait until the lamp
1-2
Note: The transducer is automatically retracted into the tank even
if the power switch is pressed before retracting the transducer.
However, make it a habit to retract the transducer before turning
off the power.
Adjusting Screen Brilliance, Control Panel Backlighting
The BRILL control adjusts screen brilliance, and the DIMMER
control adjusts control panel backlighting.
Lowering the Transducer
Press the d switch. The lamp above the switch blinks, and lights
when the transducer is fully lowered.
CAUTION
Do not exceed speed noted in the specifications when operating the equipment
or lowering or raising the transducer.
The transducer may become damaged.
Do not press the c switch during
lowering of the transducer, and do not
press the d switch during raising of the
transducer.
The equipment may become damaged.
Selecting a Display Range
Operate the RANGE control to select a display range. The range
selected appears at the top center of the screen.
Setting the T ilt Angle
The tilt angle shows the direction to which the sound wave is
emitted. When the sound wave is emitted horizontally, the tilt
angle is said to be zero degrees and when emitted vertically, 90
degrees.
To set a tilt angle, operate the TILT lever. Watch the tilt angle
indication at the top right corner on the screen. The tilt angle can
be set in one-degree steps from 0 to 55 degrees.
Finding a proper tilt angle is important when searching for fish.
Below are tips for selecting tilt angle.
1-3
Seabed echo and tilt angle
Case 1: Tilt angle 30 to 40 degrees
This tilt angle will display the entire seabed since it is captured
by the full width of the beam.
Case 2: Tilt angle 10 to 20 degrees
This tilt angle will only display half the seabed since it is only
captured by the lower half of the beam.
Case 3: Tilt angle 0 to 10 degrees
This tilt angle may or may not capture the seabed since the re-
turning echo is weak.
How to discriminate fish echoes from the seabed
The figure below illustrates how two fish schools a and b are
displayed on the screen using three different tilt angles.
Case 1
Case 1: Tilt angle 30 to 40 degrees. Fish school is obscured by
the seabed.
Case 2: Tilt angle 10 to 20 degrees. Fish school is located above
the seabed (midwater).
Case 3: Tilt angle 0 to 10 degrees. Fish school is located close to
the seabed.
Case 2
Fish school aFish school a
Case 3
Fish school a
1-4
Seabed
Seabed
Case 1 Case 2
Figure 1-3 Fish echo and tilt angle
Seabed
Fish
school
b
Case 3
Points to consider
• Normally, a vertically distributed fish school is a better sonar
target than the seabed, because it reflects the transmitted pulse
back toward the transducer.
• In case 3, both fish schools a and b are presented. Generally speaking, however, midwater fish schools tend to be lar ger
than bottom fish schools and they are often displayed near the
seabed on the display.
• It is difficult to detect bottom fish when they are not distributed vertically.
Tilt angle for surface fish
Sound emitted from the sonar transducer forms a circle-shaped
beam with a width in the vertical directions (vertical beam width)
of approximately 16 degrees for Tx and 19 degrees for Rx. The
tilt angle is indicated by the angle between the center line of the
beam and the horizontal plane. Then, if the tilt angle is set to 0
degrees, the center line is parallel with the sea surface and one
half of the emitted sound goes upward, toward the sea surface.
This causes one half of the emitted sound to be reflected toward
the transducer and displayed on the screen as sea surface reflections. When the sea is calm, since the sound is reflected just like
a light hitting a mirror at a narrow incident angle, it propagates
away and the sea surface reflections become negligible.
However if the sea is not calm enough, they will become dominant and interfere with observation of wanted echoes. To minimize these sea surface reflections and to search surface fish
schools effectively, the tilt angle is usually set between 5 and 6
degrees so the upper portion of the beam becomes almost parallel with the sea surface. When the sea is rough, it is often set to a
little larger angle.
Surface
Tilt angle 0°
Beam width Tx: 16°
Rx: 19°
Surface
Tilt angle 5-6°
Beam width Tx: 16°
Rx: 19°
Figure 1-4 Tilt angle and sea surface reflections
1-5
Suitable tilt angle
The figure below illustrates the relationship among tilt angle,
depth and detection range. Refer to it to find out the suitable tilt
angle for a given depth/detection range.
Tilt angle and beam coverage
20(40)
40(80)
60(120)
80(160)
100(200)
Depth (m)
200(400)
Vertical width of sonar beam
100 m100 m
100
(200)
200
(400)
200 m
300
(600)
300 m
Range (m)
400
(800)
0°
5°
10°
15°
16°
28 m
56 m
84 m
Figure 1-5 Tilt angle and beam coverage
1-6
Adjusting the Gain
The GAIN control adjusts receiver sensitivity (gain). Adjust it
so fish echoes are clearly displayed with minimal noise on the
screen. Too high a setting not only displays excess noise and
makes it difficult to discriminate wanted echoes but also causes
seabed echoes to be painted in strong colors, resulting in echoes
being masked by seabed reflections. Normally, set the control
somewhere between positions “3” and “7”.
Gain low
Gain proper
Figure 1-6 Gain settings and resulting picture
Gain high
1-7
Standard Markers and Data
R
T
G
B
°
R
° B
Bearing of
bearing marker
Range to
range marker
Range
ring
Range
marker
Bearing
marker
Range
Tilt
Trackball marker data
Slant range
Horizontal range
Depth
True bearing
Trackball
marker
Heading
marker
Own ship
marker
Heading data
(Requires INTERFACE Board and gyrocompass.)
(M)
Unit of depth
measurement
Gain
MARKERS AND DA T A
Figure 2-1 Standard markers and data
2-1
Table 2-1 Standard markers and data description
Marker/Data Description
Own Ship Marker
Trackball
Marker
Trackball Data
→
→
↓
B °
Bearing and Range
Markers
Bearing
marker
Range marker
Marks position on the screen. Direction of arrow is heading.
The trackball marker selects location for markers and own ship’s
position. The trackball moves the marker over the entire screen.
Trackball data:
→
: Slant range
→: Horizontal range
↓ : Depth
B : Bearing
Bearing is shown in 360¡ or –180¡ indication system, relative to ship’s
heading. In the latter case, "B" is indicated as follows:
BP.... on the port side
BP.... on the starboard side
The bearing marker bisects the trackball marker location when the R/B
key is pressed to monitor fish echoes with audible sound. Furthermore,
the radius of the range marker is at the trackball marker location. These
markers may be erased by placing the trackball marker near the own
ship marker and pressing the R/B key.
Range and Bearing
Marker Data
R ° B
Range Rings
Range Data
R
Tilt Data
T °
Gain
Setting Change
Data
The slant range to the range marker and the bearing of the bearing
marker are displayed.
The range rings are inscribed at intervals of 1/4 of the range in use.
Range ring data is also provided every two range rings. The range ring
interval can be changed from 1/4 to 1/2 through the menu.
Shows the range scale set with the RANGE control.
The tilt angle set with the TILT lever is displayed in 1¡ steps between
0¡ and 55¡.
Gain setting is displayed in increments of 0.5 between 0 and 10.
When the controls in the table below are changed new setting appears
in large characters at the top of the screen for five seconds.
Control Display
RANGE
TILT
R
T °
2-2
GAIN
G.
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