Furuno CSH-7 User manual

COLOR SCANNING SONAR
MODEL CSH-7

FIRST EDITION : MAY 1997
Your Local Agent/Dealer
FURUNO ELECTRIC CO ., LT D .
c
9-52, Ashihara-cho,
Nishinomiya, Japan 662
Telephone: [phone]
Telefax: 0798-65-4200
All rights reserved.
Printed in Japan
PUB. No. OME-13020
CSH-7
(DAMI)

iiiiiiiiiiiii i
SAFETY INSTRUCTIONS
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 equip-
ment is emitting smoke or fire.
Continued use of the equipment can cause
fire or electrical shock.
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.
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.
WARNING 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 speci-
fications when operating the equipment
or lowering or raising the transducer.
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.

ii
TABLE OF CONTENTS
FOREWORD
AWord 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 DATA
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 SchoolsAurally .............................................................................................5-1
Relocating Fish School for Easy Observation .......................................................................5-2
Function Keys (F1, F2)..........................................................................................................5-3
Event Markers, Own Ship Event Markers.............................................................................5-5

iii
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

iv
FOREWORD
A Word 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 qual-
ity marine electronics equipment. This dedication to excellence is furthered by our exten-
sive 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 op-
eration 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, distri-
bution 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 con-
trol is adjusted.
• Function keys automatically setup the equipment to perform specific task.
• High power MOS FET transmitter ensures reliable operation under any condition.

v
System Configuration
CSH-7040
TRANSCEIVER UNIT
RECTIFIER
RU-3424
100-115 VAC/
200-230 VAC
1φ, 50/60 Hz
Ship’s Mains
24 VDC
HULL UNIT
600 mm stroke
400 mm stroke
CSH-7030
CSH-7031
* Interface Module CSH-7050 (option)
required to connect external equipment.
DISPLAY UNIT
CSH-7010
(*)
NAVIGATOR
CURRENT INDICATOR
GYROCOMPASS
SPEED LOG
TILT RANGE
GAIN
(Option)
(Option)
REMOTE
CONTROLLER
CSH-7020

1-1
OPERATIONAL OVERVIEW
Equipment Overview
All operations of the CSH-7 are carried out through the display
unitandthe remote controller(option). Theuncluttered,straight-
forward control panel of the display unit provides intuitive op-
eration.Ifyou changeacontrol setting you willsee the associated
reaction on the display almost immediately.
The handy remote controller provides armchair control of range,
gain and tilt functions.
ON
OFF 010
BRILL
GAIN
TILT
MENU
EVENT OFF
CENTER
F1 F2
R
COLOR SCANNING SONAR CSH-7
B
– +
– +
TX
d
c
BRILL
control
POWER
switch
RANGE
DIMMER AUDIO
DIMMER
control AUDIO
control
Trackball
Control
panel
TILT RANGE
GAIN
Figure 1-1 Display unit, Remote controller

1-2
Display Unit Control Panel Description
GAIN
TILT
MENU F1 F2
RB
– +
– +
TX
d
cTurns 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.
RANGE
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.
EVENT OFF
CENTER
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.
Draws straight line, called bearing marker, from own ship position toward
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.
Raises, lowers the transducer, respectively. Lamp above a key blinks
while the transducer is moving and lights when it stops.
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 cswitch to retract the transducer. Wait until the lamp
above the switch lights and then press the power switch to turn
off the system.
Note:The transducer is automaticallyretracted into thetank 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.

1-3
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 dswitch. The lamp above the switch blinks, and lights
when the transducer is fully lowered.
CAUTION
Do not exceed speed noted in the speci-
fications when operating the equipment
or lowering or raising the transducer.
The transducer may become damaged.
Do not press the cswitch during
lowering of the transducer, and do not
press the dswitch 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 Tilt 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.

1-4
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 aand b are
displayed on the screen using three different tilt angles.
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 1 Case 2 Case 3
Fish school a
Seabed Fish
school
b
Case 3
Case 1 Case 2
Fish school aFish school a
Seabed Seabed
Figure 1-3 Fish echo and tilt angle

1-5
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 aand b are presented. Gener-
allyspeaking, however, midwater fishschools tend to belarger
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 distrib-
uted vertically.
Tilt angle for surface fish
Sound emitted from the sonar transducer forms a circle-shaped
beamwith a widthin 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 reflec-
tions. 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 domi-
nant and interfere with observation of wanted echoes. To mini-
mize 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 paral-
lel with the sea surface. When the sea is rough, it is often set to a
little larger angle.
Tilt angle 0°
Surface
Tilt angle 5-6°
Surface
Beam width Tx: 16°
Rx: 19°
Beam width Tx: 16°
Rx: 19°
Figure 1-4 Tilt angle and sea surface reflections

1-6
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.
100
(200) 200 (400) 300 (600) 400
(800)
Range (m)
0°
5°
10°
15°
20(40)
40(80)
60(120)
80(160)
100(200)
200(400)
Vertical width of sonar beam
16° 28 m
100 m100 m
300 m
84 m
200 m
Depth (m)
56 m
Tilt angle and beam coverage
Figure 1-5 Tilt angle and beam coverage

1-7
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 Gain high
Figure 1-6 Gain settings and resulting picture

2-1
MARKERS AND DATA
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
Figure 2-1 Standard markers and data

2-2
Table 2-1 Standard markers and data description
Marks position on the screen. Direction of arrow is heading.
Range Rings
Range and Bearing
Marker Data
R° B
Trackball
Marker The trackball marker selects location for markers and own ship’s
position. The trackball moves the marker over the entire screen.
Trackball Data
→
↓
B °
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 marker
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.
Range Data
RShows the range scale set with the RANGE control.
When the controls in the table below are changed new setting appears
in large characters at the top of the screen for five seconds.
Gain setting is displayed in increments of 0.5 between 0 and 10.
Tilt Data
T°
Gain
Setting Change
Data
Control Display
RANGE
TILT
GAIN
R
T°
G.
Marker/Data Description
Own Ship Marker
Bearing and Range
Markers Bearing
marker
The tilt angle set with the TILT lever is displayed in 1¡ steps between
0¡ and 55¡.
→
→

2-3
Optional Markers and Data
Various markers and data are available with connection of the
INTERFACE Board and appropriate external equipment.
Optional markers and data in the normal mode
184
16
( 199)
B E/N
187
186
16
B 23°S
E/N
R 300
T 5°
G 3.0
E
S
W
300
N3
2
1
Trackball
marker
data
Tidal
current
marker
Own
ship
event
marker
Course
line
Electronic
bearing
scale
Heading indication
Latest
event
marker
Latest
event
marker
data
Past
event
marker
Trackball
marker
Figure 2-2 Optional markers and data in the normal mode

2-4
Optional markers and data in the normal plus text
mode
367
38
( 165)
B 283° R 313 B 7°P
S
C
D
T
496
493
51
B 52°S
NW/N
R 800T
T 5°
G 4.0
N
S
W3
2
1
Heading indication
Latest
event
marker
data 0.0
NW/W
174
17.0
34:
C1:
C2:
C3:
13.02N 135: 16.39E
1.1 315°
0.6 25°
1.2 64°
Position
Past
event
marker
Tidal current
data
Nav
data
Latest
event
marker
Figure 2-3 Optional markers and data in the normal plus text
mode

2-5
Table 2-2 Optional markers and data description
Latest Event Marker
Data
→
↓()
B °
Tidal Current Data
C1: .
C2: .
C3: .
Course Line Marker
Electronic Bearing
Scale
The position data of the latest event marker, that is, horizontal range
(→), current depth (↓) and bearing. ( ) shows the latest event
marker’s original depth, and remains unchanged regardless of ship’s
movement or tilt angle. When the event marker is erased the above data
disappears from the screen.
To erase an event maker, place the trackball maker on the event marker
and press the EVENT key.
You can plot ten own ship event markers on the course line. This mar-
ker can be erased.
The electronic bearing scale is available with gyrocompass connection.
It rotates with own ship’s movement.
N
S
WE
With gyrocompass or speed log connection, own ship’s course line is
plotted by a solid line. Course line length is selectable from 5 to 10
times the range in use. Course line can be erased through the menu.
In the normal mode plus text, tide speed and direction for three tide
layers appear in the text area. The method for displaying current
direction can be selected through the menu.
Nav Data
S: .
C:
D:
T: .
Own Ship Data
°.N
°.E
Own ship speed(S), Heading(C), Depth(D) and Water temp-
erature(T) can be displayed on the text area. (Requires appropriate
sensors.)
The north marker is displayed with gyrocompass connection.
1
3
2
North Marker
Marker Description
With current indicator connection, the tidal current marker shows the
speed and direction of three tide layers, numbered 1 through 3. The tide
speed is shown by vector length. However, no vectors develop if the
tide speed is 0.1 knots or less. Tidal current markers can be erased.
Tidal
Current
Marker
Own Ship
Event Marker

3-1
MENU OVERVIEW
The menu system consists of four menus: Scan menu, Menu-1,
Menu-2, and System.The Scan menu can be opened while trans-
mitting, and contains items which the user will often change
during the course of operation. Menu-1 (similar to the Scan
menu), Menu-2 and System menus can be opened with the trans-
mitter turned off. Menu-2 and the System menus contain items
which once set do not require frequent adjustment.
Scan Menu Operation
Displaying the scan menu
1. Press the TX switch to light the lamp (transmitter on state)
above it, if it is not already lit.
2. Press the MENU key. The first five items of the Scan menu
appear. (The figure below shows the entire menu.)
**SCAN MENU ** (RANGE SW: U/D GAIN SW: L/R)
DEGAUSS
AUTO DEGAUSS
DISPLAY MODE
TX OUTPUT
PULSELENGTH
TX CYCLE
TVG NEAR
TVG FAR
AGC
NOISE LIM
VP
IR
MARK ERASE
HOR BEAM ANGL
RES COL CURVE
COLOR EMPHASIS
FUNC1 PROG
FUNC2 PROG
USER PROG
: EXECUTE
: OFF
: NORM
:10
:10
:10
:10
:10
:10
:10
: 0
: 0
: COURSE
: WIDE
: LINEAR
: 1 (LOW)
: USER1
: USER2
: USER1
TIMER
TEXT
SHIP
NARROW
1
2
SETUP1
SETUP1
USER2
GYRO
2
3
SETUP2
SETUP2
3
4 (HIGH)
SETUP3
SETUP3
#
#
#
Requires INTERFACE Board.
# Locked setting (in red). To change, select item, adjust GAIN control to
display YES, and press the TX key. Selected item appears in green;
setting may now be changed.
Figure 3-1 Scan menu