Furuno CH-37 Radar Detector User Manual

COLOR SECTOR SCANNING SONAR
MODEL
CH-37
Your Local Agent/Dealer
9-52 Ashihara-cho,
Nishinomiya, Japan
Telephone :
0798-65-2111
Telefax :
0798-65-4200
All rights reserved.
Printed in Japan
FIRST EDITION : JUL. 1998
E
PUB.No. OME-13030
( TENI
) CH-37
: MAY. 17,2002
*00080821101*
*00080821101*
*00080821101*
*OME13030E00*
*OME13030E00*
*OME13030E00*
SAFETY INSTRUCTIONS
WARNING
WARNING
Keep heater away from equipment.
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
A heater can melt the equipment’s power
cord, which can cause fire or electrical
shock.
Only qualified personnel
should work inside the
equipment.
Use the proper fuse.
Immediately turn off the power at the
switchboard if water leaks into the
equipment or something is dropped in
the equipment.
Fuse rating is shown on the equipment.
Use of a wrong fuse can result in equipment
damage.
Do not operate the equipment with wet
hands.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
Electrical shock can result.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
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.
Immediately turn off the power at the
switchboard if the equipment is emitting
smoke or fire.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
Make sure no rain or water splash leaks
into the equipment.
Fire or electrical shock can result if water
leaks in the equipment.
i
i
CAUTION
WORKING WITH THE SONAR OIL
Precautions
• Keep oil away from eyes. Wear protective
gloves when working with the oil. The oil
can cause inflammation of the eyes.
• Do not touch the oil. Wear protective
gloves when working with the oil. The oil
can cause inflammation of the skin.
• Do not ingest the oil. Diarrhea or vomiting
can result.
• Keep the oil out of reach of children.
Emergency
• If the oil enters eyes, flush with clean water
about 15 minutes. Consult a physician.
• If the oil contacts skin, wash with soap and
water.
• If the oil is ingested, see a physician
immediately.
Name: Warning Label (1)
Type: 86-003-1011-0
Code No.: 100-236-230
Disposal of oil and its container
Dispose of oil and its container in accordance with local regulations. For further
details, contact place of purchase.
Storage
Seal container to keep out foreign
material. Store in dark place.
ii
TABLE OF CONTENTS
FOREWORD ................................................................................................................... v
SYSTEM CONFIGURATION ................................................................................... vi
MENU TREE .................................................................................................................. vii
OPERATIONAL OVERVIEW
1.1 Control Description....................................................................................................... 1-1
1.2 Turning the Power On/Off ............................................................................................ 1-3
1.3 Adjusting Screen Brilliance, Panel Backlighting ........................................................... 1-3
1.4 Lowering the Transducer ............................................................................................. 1-3
1.5 Presentation Mode ....................................................................................................... 1-4
1.6 Background Color ........................................................................................................ 1-6
1.7 Degaussing the Screen ................................................................................................ 1-6
SONAR MODE
2.1 Typical Operating Procedure ........................................................................................ 2-1
2.2 Selecting Range ........................................................................................................... 2-2
2.3 Selecting Sector, Sector Stepping ............................................................................... 2-3
2.4 Setting the Tilt Angle .................................................................................................... 2-4
2.5 Adjusting Gain .............................................................................................................. 2-7
2.6 Rejecting Sonar Interference and Noise ...................................................................... 2-7
2.7 Detecting Fish Schools Aurally .................................................................................... 2-9
2.8 R/B and Event Markers (trackball operation) ............................................................. 2-10
2.9 Selecting Training Sector Quickly ............................................................................... 2-11
2.10 Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds ...... 2-11
2.11 Suppressing Bottom Tail ........................................................................................... 2-12
2.12 Displaying Surface Fish Clearly (TVG adjustment).................................................. 2-12
2.13 Relocating Fish School for Easy Observation .......................................................... 2-14
2.14 Finding Fish School Center ...................................................................................... 2-14
2.15 Sonar Menu Operation ............................................................................................. 2-15
2.16 E/S Menu ................................................................................................................. 2-16
2.17 Turning Trackline Plotting On/Off ............................................................................. 2-17
2.18 Interpreting the Display ............................................................................................ 2-18
2.19 Sonar Mode Indications ........................................................................................... 2-24
2.20 Application Example ................................................................................................. 2-26
VERTICAL FAN MODE
3.1 Typical Operating Procedure ........................................................................................ 3-1
3.2 Selecting Range ........................................................................................................... 3-2
3.3 Selecting Bearing for the Vertical Fan .......................................................................... 3-3
3.4 Selecting the Display Sector ........................................................................................ 3-4
3.5 Automatic Shifting of Own Ship Position ...................................................................... 3-5
3.6 Rejecting Sonar Interference and Noise ...................................................................... 3-5
3.7 Horizontal, Vertical and Event Markers (trackball operation) ....................................... 3-6
3.8 Applying Proper TVG ................................................................................................... 3-7
iii
3.9 Bottom/3D Menu Operation ......................................................................................... 3-8
3.10 Interpreting the Display .............................................................................................. 3-9
3.11 Vertical Fan Mode Indications .................................................................................. 3-12
3.12 How to Use the Vertical Fan Mode .......................................................................... 3-13
3D MODE
4.1 Selecting a 3D Display ................................................................................................. 4-1
4.2 Turning Vertical Echoes On/Off .................................................................................... 4-2
4.3 Changing 3D View Scale Mode and Scale Selection .................................................. 4-3
4.4 Other Operations.......................................................................................................... 4-3
CUSTOM MODE KEYS ( 1 , 2 , 3 )
5.1 About the Custom Mode Keys ..................................................................................... 5-1
5.2 Customizing the Keys .................................................................................................. 5-1
5.3 Custom Mode Operation .............................................................................................. 5-2
MENU SETTINGS
6.1 System Setting Menu ...................................................................................................
6.2 Screen Adjustment .......................................................................................................
6.3 System Menu ...............................................................................................................
6.4 Dual Menu ....................................................................................................................
6-1
6-2
6-4
6-9
MAINTENANCE & TROUBLESHOOTING
7.1 Maintenance of Display Unit ........................................................................................ 7-1
7.2 Maintenance of Transceiver Unit ................................................................................. 7-1
7.3 Maintenance of Hull Unit .............................................................................................. 7-2
7.4 Display Unit Test .......................................................................................................... 7-3
7.5 Train/Tilt Test ................................................................................................................ 7-5
7.6 Test Pattern .................................................................................................................. 7-6
7.7 Error Messages ............................................................................................................ 7-6
7.8 Troubleshooting Table .................................................................................................. 7-9
CUSTOM MODE KEY LABELS .......................................................................AP-1
SPECIFICATIONS ..................................................................................................SP-1
INDEX .......................................................................................................................Index-1
iv
FOREWORD
Congratulations on your choice of the FURUNO CH-37 Color
Sector Scanning Sonar! We are confident that you will enjoy
many years of trouble-free operation with this fine piece of equipment.
For over 40 years FURUNO Electric Company has enjoyed an
enviable reputation for quality and reliability throughout the
world. This dedication to excellence is furthered by our extensive global network of agents and dealers.
The CH-37 is the newest addition to FURUNO’s CH family of
sonars. This new sonar is especially designed to provide faster
detection capability by sector scanning method and improved
operation by rotary controls and trackball. The sonar picture is
presented in 16 or 8 colors on a high resolution CRT. The excellent signal processing technique and improved receiver bring
you a clear and high-quality picture on a 15-inch screen.
We would appreciate feedback from you, the end-user, about
whether we are achieving our purpose.
Thank you for considering and purchasing FURUNO equipment.
Features
• Multi sector scanning provides quick coverage of full 360°
area in just 8 transmissions.
• PPI operation can be selected for superior detection range
and bottom fish sounding.
• Custom mode keys provide desired sonar settings by one
key stroke.
• Selectable background color lessens eye fatigue in both
daytime and nighttime operations.
• Selection of frequencies - 60, 81, 113, 162 kHz.
• Trackball offers easy-to-use operation for marker settings.
• Quick training and quick raise/lower operation.
• Vertical mode presents a vertical section of underwater conditions.
• 3D mode shows vertical echoes like a graphic track plotter.
v
SYSTEM CONFIGURATION
OPTIONAL SUPPLY
STANDARD SUPPLY
DISPLAY UNIT
CH-370
LOUDSPEAKER
SC-05WR
REMOTE CONTROL BOX
CH-343
External
External
Interface
Interface
OP06-13
OP06-13
02S8040 6M (Built-in)
(Built-in)
EXTERNAL
MONITOR
Clinormeter
MOTION
SENSOR or BS-704
MS-100
24-32V DC
External
Interface
OP06-14
(Built-in)
06S4067 15/30/50M
250VDPYCYS-2
External
Interface
OP06-13
(Built-in)
250V-DPYCYS-2
250V-DPYCYS-2
250V-DPYCYS-2
250V-DPYCYS-2
: Connector to fitted at installation
: Connector fitted at factory
: Crimp-on lug to be fitted at installation
NOTE 1: Two sets of rectifiers are necessary for AC mains.
NOTE 2: DC ship's mains only. For AC ship's mains, the power
is supplied directly from the rectifier unit to the transceiver unit.
vi
MENU TREE
TX RATE
TX PULSE LENGTH
TX OUTPUT POWER
TX EXT SYNC
IR
STABILIZER
COLOR
RES. COLOR
SONAR
[MENU] key
BOTTOM/3D
TVG (LEVEL)
TVG (TIME)
BEAM WIDTH
AUTO TRAIN SECTOR
VERT. ECHO OVERLAY
3D VIEW SCALE
TIME SCALE
DUAL
DUAL MODE
NET MOUTH SHIFT
NET MOUTH WIDTH
NET MOUTH HEIGHT
NET DEPTH
HOR SCAN RATE
VERSCAN RATE
E/S
[PWR] key + [MENU] key
SYSTEM MENU
RANGE
SHIFT
GAIN
N.L.
IR
ADVANCE SPEED
RES. COLOR
SYSTEM SETTING
3D DISPLAY
RANGE - SONAR MODE
SHIP'S POSITION
RANGE - VERTICAL FAN MODE
RANGE/SHIFT - E/S
CURRENT DATA
DEPTH DATA
HEADING INDICATION
COLOR
NORTH MARK
LANGUAGE
TRACK
DISPLAY TEST1 - ROM/RAM/KEY
HDG/SPD DATA
TRAIN/TILT TEST
NAV DATA
SCREEN ADJUSTMENT
TEST PATTERN
DATA FORMAT FOR NAV2
CIF BAUD RATE
TVG CORRECTION
DISPLAY TEST2 - OPERATION
UNIT
DEFAULT
V-MODEL MANUAL TRAIN
DEGAUSSING INTERVAL
FACTORY SETTING
vii
This page is intentionally left blank.
OPERATIONAL OVERVIEW
1.1 Control Description
Main panel
Switches on and off the entire system.
PWR
O
Controls the transducer. Each switch functions as follows:
: Raises the transducer.
: Lowers the transducer.
TRANSDUCER
-
MODE
+
RANGE
4
6
8
2
0
TILT
SECTOR
FULL
HALF
10
GAIN
TRAIN
EVENT
R/B
Selects display mode (from left-hand position):
Normal Sonar Mode or Normal Sonar Mode + E/S Combination*
Expanded Sonar Mode
Vertical Fan Mode or Vertical Fan Mode + E/S Combination*
3D Display* (front perspective view)
3D Display* (slant perspective view)
*: Optional supply
Selects the detecting (display) range. Turn clockwise to increase the
detection range. The selected range appears in large characters for a
few seconds and remains at the upper right corner of the screen.
Determines the center bearing of the train sector. The selected bearing appears by a large white mark on the bearing scale. In the
expanded sonar mode, it controls the direction to be off-centered (four
directions). In the vertical fan mode, it determines the bearing of the
vertical fan training.
Adjusts the sensitivity of the receiver. Turning the control clockwise
increases the sensitivity. When changing the range and tilt settings,
readjust the sensitivity. For normal use, set it between 3 and 5.
In the sonar mode, it controls the tilt angle, between +5° and -90°. The
setting angle is set in 1-degree steps and appears at the upper right
corner of the screen. In the vertical fan mode, it determines the sector
center of vertical scanning.
1
2
CUSTOM MODE
3
ENTER
CH-37
In the sonar mode, it selects the width of the transducer training sector
among six positions (45°, 90°, 135°, 180°, 225°, and 360°). The direction of training can be made in both directions except at the 360° setting. In the vertical fan mode, the sector widths are 36°, 60°, 96°, 120°,
156°, and 180°. FULL/HALF key switches the training sector or sector
width between full circle and half circle by single key stroke.
The trackball moves the trackball marker (+). The trackball mark data,
that is, slant range, horizontal range, depth and bearing to the trackball marker, are always indicated on the screen. Additionally, this control positions the R/B (Range/Bearing) marker and sets the event
marker, with the R/B and the EVENT keys. The EVENT key displays
the event marker.
Provides user-defined sonar settings with a single key. The ENTER
key opens the custom mode key setting menu.
Figure 1-1 Main panel
1-1
Sub panel
Function
Sub-panel 1
0
10 0
10 0
LEVEL TIME
TVG
0
10 0
10 0
NL
10
DIMMER BRILL
HUE
LEVEL controls the receiver sensitivity
to eliminate surface noise, which may
mask shallow targets. TIME determines
the TVG effective range.
NL
Rejects noise which appears on the
screen in light blue or blue. A setting
between 2 and 4 will suffice in most
cases.
AUDIO
Adjusts the volume of the external loudspeaker, which monitors target echoes.
DIMMER
Adjusts panel backlighting.
BRILL
Adjusts screen brilliance.
Function
E/S DEGAUSS
FAST TRACK
SCAN
TVG
10
AUDIO
Description
HUE
Changes the background color of the
display in the sequence of deep blue,
blue, black.
E/S
Turns the E/S combination display
on/off. (Optional devices required.)
DEGAUSS
The screen is automatically degaussed
at the interval selected on the system
setting menu. To manually degauss the
screen press this key.
FAST SCAN
Changes the sector steps (45°/6° in
sonar mode and 6°/3° in vertical fan
mode).
TRACK
Turns the course line plotting on/off.
(Navigation equipment required.)
V:H RANGE
Changes the horizontal range scale in
the vertical fan mode.
V:H AUTO
RANGE TRAIN
BOTTOM MODE
MENU
MENU
Description
Sub-panel 2
AUTO TRAIN Changes the auto and manual train in
the vertical fan mode.
MENU
Displays the menu screen of the mode
in use.
Figure 1-2 Sub panel 1 and sub panel 2
1-2
1.2 Turning the Power On/Off
Power on
Press the PWR switch on the main panel. The lamp above the
switch lights to show that power is turned on.
Power off
Retract the transducer with the g key on the main panel. The
lamp above the switch lights while the transducer is being raised
and goes off when the transducer is fully raised. Then, press
the PWR switch.
Note: The transducer is automatically retracted into the tank
even if the PWR switch is pressed before retracting the
transducer. However, for safety purposes, make it a habit
to retract the transducer before turning off the power.
1.3 Adjusting Screen Brilliance, Panel Backlighting
The BRILL control adjusts screen brilliance and the DIMMER
controls adjusts panel backlighting. These controls are on the
sub panel 1.
1.4 Lowering the Transducer
Press the h switch on the main panel to lower the transducer.
The lamp above the switch blinks while the transducer is being
lowered and lights when the transducer is fully lowered.
CAUTION
Observe maximum allowable ship’s speed
of 18 knots during operation and 15 knots
while raising/lowering transducer, to prevent
damage to the transducer.
1-3
1.5 Presentation Mode
Five presentation modes are available with the MODE control:
Normal sonar, Normal sonar + combination, Expanded sonar,
Vertical fan mode or Vertical fan mode + combination and 3D
display mode (front and slant perspective views).
Mode
Presentation
Normal sonar mode
Normal full circle picture appears on
the entire screen.
Normal sonar + E/S, vertical fan
or sonar
Normal full circle picture appears at
the upper 2/3 of the screen; the echo
sounder, vertical fan or sonar on the
lower 1/3. To select the picture to
display in the lower 1/3, see DUAL
MODE on page 6-9.
(Echo sounder required to display
echo sounder picture).
Expanded sonar mode
Zoomed picture appears on the
entire screen. The echo size on the
screen is expanded 1.5 times.
(Continued on next page)
1-4
Mode
Presentation
Vertical fan mode
A vertical section of underwater
conditions (half-circle area) appears
on the entire screen.
Vertical fan mode + E/S or sonar
A vertical section of underwater
conditions (half-circle area) appears
on the upper 2/3 and echo sounder
or sonar picture on the lower
1/3. To select the picture to display
in the lower 1/3, see DUAL MODE
or page 6-9.
(Echo sounder required to display
echo sounder picture).
3D display (front perspective view)
The vertical contour line appears
historically (time or distance). Only
the latest echo is painted, like
the vertical mode presentation.
This mode may be turned on
in the SYSTEM menu.
3D display (slant perspective view)
Display contents are same as front
perspective mode except the perspective is different. This mode may
be turned on in the SYSTEM menu.
Note: Asterisk-marked modes require external signal interface
and external E/S interface. Furthermore the E/S key on
the sub panel 2 must be turned on.
1-5
1.6 Background Color
The background color is available in deep blue, blue or black,
with the HUE key.
1.7 Degaussing the Screen
The screen is automatically degaussed at the interval selected
on the SYSTEM SETTING menu. However, when the picture
or picture color appears to be distorted, manually degauss the
screen with the DEGAUSS key.
1-6
SONAR MODE
2.1 Typical Operating Procedure
1
2
PWR
O
TRANSDUCER
4
+
-
1 Turn on the display unit.
RANGE
MODE
4
2 Lower the transducer.
6
8
2
0
8
GAIN
TRAIN
3 Adjust the brilliance of the CRT.
10
4 Set the MODE knob to
or
position.
5 Select the range desired with the RANGE control.
TILT
SECTOR
FULL
HALF
EVENT
6 Select the automatic training area and center position with the SECTOR and TRAIN controls. The FULL/HALF key provides a quick
change of the area (225°
360°).
R/B
7 Adjust the tilt angle with the TILT control. See page 2-3 through 2-5
for details.
10
8 Adjust the GAIN and TVG controls.
[Gain: 3-5, TVG (level & time): 3-5]
8
9 Adjust the NL control if a large number of small blue dots appear on
the screen. Normally set it between 2 and 4.
0
1
10 0
2 NL AUDIO
3
10 0
LEVEL TIME
TVG
CUSTOM MODE
0
10 0
10 0
10
10 With the trackball marker, measure the distance to a fish school or
the bottom.
ENTER
10
DIMMER BRILL
CH-37
HUE
12
3
12 Turn off "FAST SCAN" mode if longer detection is required.
E/S DEGAUSS
FAST TRACK
SCAN
11 Reduce the output power if necessary. Normally, set it for maximum
position (C).
V:H AUTO
RANGE TRAIN
BOTTOM MODE
MENU
MENU
Figure 2-1 Main panel and sub panel controls
2-1
2.2 Selecting Range
The RANGE control selects the detection (display) range. Select the range according to either the fish species being
searched or the depth desired. Normally it is set so that the
bottom is traced at the lower part of the screen (like an echo
sounder).
SEA SURFACE
Range indicated
on the screen.
BOTTOM
Figure 2-2 Range selection
Table 2-1 Transducer frequency and range
Freq.
-
RANGE (m*)
+
60 kHz
50
100
150
600
800
1200
1600
81 kHz
60
100
150
500 1000
800
1200
113 kHz 50
100
150
500
600
800
1000
162 kHz 50
100
150
450
500
600
800
Range (m)
Note: Unit of range measurement may be changed through
the SYSTEM menu. For details see page 6-1.
2-2
2.3 Selecting Sector, Sector Stepping
Sector width
Sector means the width of the transducer training. The SECTOR control selects the training (display) area among six positions. In the full circle mode (360°) the direction of training is
clockwise only.
Table 2-2 Transducer training sector
Mode
Sonar mode
Transducer Training Sector (display area)
45°, 90°, 135°, 180°, 225°* and 360°*
* Selected by FULL/HALF key.
Sector center marker
Training sector
90°
Figure 2-3 Sector selection
Sector step
The FAST SCAN key in the sub panel 2 selects sector step in
45° or 6°.
2-3
2.4 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 0° and when emitted vertically, 90°.
To set a tilt angle, operate the TILT control. Watch the tilt angle
indication at the top right corner of the screen. The tilt angle
can be set in one-degree steps from -5° (upward) to 60° (downward).
Finding a proper tilt angle is important when searching for fish.
Bottom echo and tilt angle
Case 1: Tilt angle 30° to 40°
This tilt angle will display the entire bottom since it is captured
by the full width of the beam.
Case 2: Tilt angle 10° to 20°
This tilt angle will only display half the bottom since it is only
captured by the lower half of the beam.
Case 3: Tilt angle 0° to 5°
This tilt angle may or may not capture the bottom since the
returning echo is weak.
How to discriminate fish echoes from the bottom
The figure at the top of the next page illustrates how two fish
schools a and b are displayed on the screen using three different tilt angles.
Case 1: Tilt angle 30° to 40°. Fish school is obscured by the
bottom.
Case 2: Tilt angle 10° to 20°. Fish school is located above the
bottom (midwater).
Case 3: Tilt angle 0° to 5°. Fish school is located close to the
bottom.
2-4
Case 1
Case 3
Case 2
Fish School a
Fish school a
Fish school b
Bottom
Bottom
Fish school a
Fish school b
Fish school b
Case 1
Case 2
Case 3
Figure 2-4 Fish echo and tilt angle
Points to consider
• Normally, a vertically distributed fish school is a better sonar
target than the bottom, 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
larger than bottom fish schools and they are often displayed
near the bottom 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 an oval-shaped
beam with a width of approximately 13° (for 60 kHz transducer)
in the vertical direction (vertical beam width). 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°, 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.
2-5
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° 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.
Sea surface
Tilt angle 0°
11°
R400
T 15
Sea surface
Tilt angle 5-7°
Tilt
angle
11°
Figure 2-5 Tilt angle and sea surface reflections
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 (frequency, 60 kHz, vertical beamwidth, 13°
100
(200)
200
(400)
300
(600)
20(40)
Range (m)
400
(800)
0°
5°
40(80)
60(120)
10°
80(160)
15°
100(200)
Depth (m)
200(400)
Vertical width of sonar beam
300 m
200 m
100 m
°
13
23 m
46 m
68 m
Figure 2-6 Tilt angle and beam coverage
2-6
2.5 Adjusting Gain
Most equipment malfunctioning claims result from improper
setting of switches and controls. For example, fish, fish habitat
or outcrop can not be readily detected by merely increasing
the gain. Initially set the gain between 3 and 5 with the GAIN
control. Then, fine tune depending on the fishing ground, frequency used, etc.
Turn GAIN control clockwise.
4 6
8
2
0
10
es
ho
le
ec
Adjust NL control.
eb
Fe
4 6
8
2
0
10
e
Few fish found
or difficult to
find fish
habitat.
om
d
Ran
nois
Adjust TVG controls.
Surfa
4 6
8
2
0
10
ce no
In
ise
CLEAR
PICTURE!
te
rfe
re
nc
e
Turn on "IR" in SONAR menu.
Figure 2-7 How to set the gain
2.6 Rejecting Sonar Interference and Noise
While observing the sonar picture, you may encounter occasional or intermittent noise and interference as shown below.
These are mostly caused by onboard electronic equipment,
engine, propeller noise, or electrical noise from other sonars
being operated nearby.
(A) Inteference from
other sonars
(B) Interference from
marine life
Figure 2-8 Noise and interference
2-7
Identifying noise source
To eliminate noise effectively, you should first identify the source
as follows:
• Operate all onboard equipment one by one while observing
the picture.
• Run the boat at various speeds to check if the noise is speed
dependent.
If neither of the above affects the picture, turn on “IR” in the
SONAR menu or adjust the NL (Noise Limiter) control as below.
Rejecting noise with the interference rejector
This control is effective in rejecting random noise and sea surface reflections in rough sea conditions. Pull the GAIN control
and adjust it to eliminate only noise. Reject the noise with “IR”
in the SONAR menu. Do not use an unnecessarily high setting
since it many also reject small wanted echoes.
Rejecting noise with NL control
Weak, unwanted reflections, colored light blue or green, appear when water is contaminated, or plankton layers or noise
exist. These echoes gradually become bluish as the NL control
is turned clockwise. Usually a setting from 3 to 4 provides sufficient reduction.
Rejecting interference with Tx rate
When other sonars are operating nearby at the same transmission interval as that of own ship’s sonar, interference caused
by other sonars appears. To reduce the interference, reduce
the Tx rate setting on the SONAR menu.
Note: When the sonar is used in shallow water with the range
set between 100 m and 200 m and the Tx rate at 10,
bottom reflections caused by the transmission which is
the last but one appear on near on screen. Reduce the
Tx rate to 7 or 8 to reject them.
2-8
2.7 Detecting Fish Schools Aurally
Occasionally you will be preoccupied with other tasks and unable to concentrate on watching the sonar picture. In such cases
it would be a good choice to use the audio function. This function enables you to monitor echoes from fish schools and bottom through the external speaker (option), of which the volume
can be adjusted with the AUDIO control on the sub panel 1.
After you become accustomed to utilizing the audio function,
you should be able to detect a fish school from a range longer
than you can detect it on the screen. In addition you may judge
whether the fish schools is approaching or going away; the
tone becomes higher when the fish is approaching and lower
when going away.
2-9
2.8 R/B and Event Markers (trackball operation)
The trackball functions to obtain the data (slant & horizontal
range, depth and bearing) from own ship to the specified position on the screen and, combined with the R/B and EVENT
keys, it switches the R/B and event markers on/off. With navigation data input, the event marker moves with ship’s movement.
Function
Trackball
Data
Procedures/Purpose
1) Position the trackball marker on the location desired.
Trackball data
Trackball marker
2) Read the trackball data displayed at the upper left corner
of the screen.
Event
marker
1) Position the trackball marker on the location desired.
Event marker
2) Press the EVENT key to inscribe the event marker.
3) To erase the marker, place the trackball marker outside
the echo display area and press the EVENT key.
Note: CH-37 stores one event marker.
R/B marker 1) Position the trackball marker on the location desired.
R/B marker
R/B marker data
2) Press the R/B key. The range and bearing markers
appear and their data appears at the bottom left-hand
side of the screen.
3) To erase the marker, place the marker near the own
ship position or outside the echo display area and
press the R/B key.
2-10
2.9 Selecting Training Sector Quickly
Normally the training sector is selected by the SECTOR control. To the training sector more quickly, however, use the FULL/
HALF key. This key allows switching between full circle and
half circle training sector in a single key stroke.
FULL CIRCLE
HALF CIRCLE
FULL/HALF key
SECTOR
Figure 2-9 How the SECTOR control and FULL/HALF key work
2.10 Suppressing Bottom and Sea Surface Reflections
in Shallow Fishing Grounds
In shallow fishing grounds, excessive sea surface and bottom
reflections often interfere with wanted fish echoes and they cannot be eliminated sufficiently with the aforementioned TVG controls. In such cases, try to reduce the output power from C to B
or A on the SONAR menu, without turning down the gain. The
picture becomes clearer when output power is reduced rather
than when the gain is decreased, as illustrated below.
2-11
0
10 0
10
DIMMER BRILL
HUE
E/S DEGAUSS
FAST TRACK
SCAN
V:H AUTO
RANGE TRAIN
BOTTOM MODE
MENU
MENU
: SONAR
TX RATE
:
TX OUTPUT POWER :
E/S
10
TX PULSE LENGTH : LONG
MENU
BOTTOM/3D
A
SHORT
B
C(MAX)
Figure 2-10 How to reduce bottom and surface reflections by
reducing Tx output power
2.11 Suppressing Bottom Tail
As described earlier, fish schools near the bottom are sometimes difficult to detect because you have to discriminate fish
echoes from the bottom reflections. To discriminate fish echoes
near the bottom, select the short Tx pulse length on the SONAR
menu to decrease the tail of bottom reflection.
2.12 Displaying Surface Fish Clearly (TVG adjustment)
Echoes from targets (such as the bottom or a fish) return to the
transducer in order of the distance to them, and when their intensities are compared at the transducer face, those from nearer
targets are generally stronger when their reflecting properties
are nearly equal. The sonar operator will be quite inconvenienced
if these echoes are directly displayed on the screen, since he
won’t be able to judge the actual size of the target from the size
of echoes displayed on the screen. To overcome this inconvenience, use the TVG function. It compensates for propagation
loss of sound in water: amplification of echoes on short range is
suppressed and gradually increased as range increases so that
similar targets are displayed in similar intensities irrespective of
the ranges to them.
2-12
In the CH-37, the TVG LEVEL and TIME controls compensate
for propagation loss. The effective distance is up to 1000 m
approximately.
Without TVG function
Noise caused by
strong reflection
of surface
turbulence.
Nearer target
echoes appear
in larger size. Reduce
gain for
nearby
areas,
using
TVG.
Proper TVG setting
Echoes of equal
size targets are
presented in the
same color and size.
Noise is rejected.
Position
0
10 0
10
LEVEL TIME
TVG
0
2
3
5
10
TVG Range
0m
60 m
130 m
300 m
1000 m
Figure 2-11 How to adjust TVG
The TVG also functions to suppress unwanted echoes and noise
which appear in a certain range area on the screen as shown
in the figure above.
To adjust the TVG;
1. Set TVG time between 3 and 5 (approx. 130-300 m). This
is the standard setting and you can maintain it in most cases.
2. When sea surface reflections or plankton layers disturb the
picture, set the TVG level control around 5 to eliminate them.
3. Locate a fish school on a long range setting which is approaching your vessel. Adjust the tilt to keep the fish school
in the center of the sonar beam. Check that the fish echo
appears in the same color while it approaches. If the color
changes suddenly to weaker colors as the fish echo nears,
the TVG is improperly set. Adjust the TVG level to correct it.
If sea surface reflections and noise remain, try to remove
them with the interference rejector (“IR” on the SONAR
menu) and NL control as described on page 2-8.
2-13
2.13 Relocating Fish School for Easy Observation
When a fish school is near the edge of the screen and inconvenient for observation, use the “ ” expanded sonar mode and
adjust the TRAIN control (off-center function) to relocate the
fish school close to the screen center.
Fish school
Fish
school
Own ship
Figure 2-12 How to relocate fish school
2.14 Finding Fish School Center
When you want to find the center depth of a fish school, change
the tilt angle and observe the presentation as follows:
1. Select a narrow sector range (45°) and capture the target
echoes.
2. Adjust the tilt angle with the TILT control slowly and observe the change of the presentation color.
3. The echo presented in the strongest color is the center of
the fish school.
Tilt
setting
R 800
T 8°
Figure 2-13 How to find fish school center
2-14
RANGE
TILT
2.15 Sonar Menu Operation
Operating procedure
1. Press the MENU key on the sub panel 2.
2. Select the SONAR menu with the arrow keys on the sub
panel 2.
MENU
: SONAR
TX RATE
:
E/S
10
TX PULSE LENGTH : LONG
TX OUTPUT POWER :
BOTTOM/3D DUAL
SHORT
A
B
TX EXT SYNC
:
OFF
ON
IR
:
OFF
ON
STABILIZER
:
OFF
ON
COLOR
:
16
8
RES. COLOR
:
LOG
LINEAR
EXIT
: PRESS MENU KEY
C(MAX)
SQUARE
Figure 2-14 Sonar menu
3. Select item and setting with the arrow keys. The selected
item is highlighted and the current setting is circumscribed
in white.
4. To turn off the menu, press the MENU key again.
Sonar menu description
TX RATE: Selects transmission repetition rate in ten steps. “1”
is the longest interval; “10” the shortest. Set to “10” for normal
use.
TX PULSE LENGTH: Selects Tx pulselength to “LONG” or
“SHORT.” The pulselength is adjusted automatically according
to the range setting in “LONG” or “SHORT” position. Set to
“LONG” for normal use.
TX OUTPUT POWER: Adjusts output power; “A” is for minimum power and “C,” maximum. Set to “C” for normal use, and
use a low power when sea surface reflections or bottom echo
obscures fish schools.
2-15
TX EXT SYNC: If two or more echo sounders or sonars are
operated simultaneously, mutual interference may result due
to asynchronous keying pulse output. To synchronize keying
pulse turn TX EXT SYNC on.
IR: Rejects interference. Turn off when no interference exists,
otherwise weak echoes may be missed.
STABILIZER: Select “ON” when the Motion Sensor MS-100
(option) is connected.
COLOR: Selects 16- or 8-color presentation.
RES COLOR: Sets echo presentation characteristics. LOG
enhances weak echoes and is normally used. LINEAR
downplays the weak echoes comparing with LOG. It is effective for suppressing the plankton layer. SQUARE enhances the
strong echoes comparing with LINEAR, resulting in clear and
easy-reading picture.
2.16 E/S Menu
1. Press the MENU key.
2. Select E/S at the top of the screen.
MENU:
RANGE
SONAR
BOTTOM/3D
:
:
:
:
:
:
:
:
40
240
SHIFT
0
GAIN
5.0
N.L
0
IR
OFF
ADVANCE SPEED
1/1
RES. COLOR
LOG
EXIT : PRESS MENU KEY
Default settings circumscribed.
Figure 2-15 E/S menu
2-16
DUAL
80
320
ON
1/2
LINEAR
E/S
160
1/4
Table 2-1 E/S menu description
Item
Description
RANGE
Selects echosounder range: 40, 80, 160, 240 or 320 (meters).
SHIFT
Enter display startting depth.
GAIN
Adjusts gain.
N.L.
Suppresses noise which covers the whole screen. Normally, set to 1 or 2.
IR
Suppresses interfernce from sonar of other ship or noise from electrical
machinery onboard own ship.
ADVANCE SPEED
Selects picture advance speed. The fractions the number of scan lines
produced per transmission.
RES. COLOR
Select "LOG" or "LINEAR" according to amplifier of echo sounder.
LINEAR: FCV-382, 782, 271
LOG: FCV-291, 292. 1000
2.17 Turning Trackline Plotting On/Off
With navigation data input, the CH-37 can plot ship’s track on
the sonar mode display. The track itself can be turned on/off
with the TRACK key.
2-17
2.18 Interpreting the Display
This section provides the information necessary for interpreting the display.
How the picture is painted
The wide sounding beam is emitted from the soundome at a
certain tilt angle (see hatched area in the figure below). The
information (target echoes) obtained by this beam is displayed
in 45° sector of the screen. Thus, all directions around the boat
are s ounded in 8 times of transmissions.
Note: When the “FAST SCAN” is switched off, the equipment
operates in a narrow sounding beam. Then, the echoes
appear on a 6° sector in each transmission, so 60 times
of transmissions are required to complete full 360° picture (6° x 60 = 360°). This means that sounding speed
reduces. However, since transmission power is concentrated into the narrow sounding beam, a superior detection range is obtained. Furthermore, since the bottom
contour is painted distinctly, bottom fish detection may
become easier.
Sounding Beam
Screen Display
Freq: 60 kHz
TX
Tilt θ
45°*
60°/16°
Tilt:θ
13°
Sounding
Beam
RX
16°
13°
When the narrow sounding beam (6-degree step operation) is selected, 60 transmissions
are required to complete the full circle detection.
Figure 2-16 How the picture is painted
2-18
Bottom echoes
When the tilt angle is widened, the bottom echo illustrated below will appear on the display. When the tilt is narrowed, the
bottom trace becomes wider and weaker. By observing the
bottom condition on the display, the skipper can prevent net
damage.
(A) Flat bottom
Tilt angle: 10° to 15°
Narrow tilt angle
Only half of
vertical beam width
captures the bottom.
(B) Flat bottom
Tilt angle: 20° or more
(C) Sloping bottom
Bottom is displayed
narrower and in
stronger colors when
compared to (A).
Tilt angle: 20° or more
Shallow bottom
is displayed in
a strong color
and with a
short tail.
Bottom
The deeper bottom
echo is displayed in
a weak color and
with a long tail.
Figure 2-17 Bottom echoes
2-19
Fish schools
A fish school appears as a mass of echoes on the screen. The
color of the mass shows the density of fish schools on the sonar beam. To find distribution and center point of a fish school,
try several different tilt angles.
(A) Sea surface fish
Tilt angle: -5° to 10°
Fish
school
Bottom echo not
displayed because
of narrow tilt angle.
Sea surface
reflections are
present.
Sea surface
reflections
(B) Midwater, bottom fish Tilt angle: 30° or more
Fish echo which appears before bottom can be detected.
Bottom
Fish
school
Large midwater
fish school is
present.
Tilt angle: -0° to 20°
Fish echo which appears together with
or after bottom can be detected.
Fish
school
Bottom
When the tilt angle is shallow,
he reflection echo from bottom
is weak and the fish echo
which appears from bottom
is easy to find.
Figure 2-18 Fish schools
2-20
Sea surface reflections
To reduce sea surface reflections, set the tilt angle to 5° or
higher, so the upper edge of the sonar beam does not hit the
sea surface, or adjust TVG. When a narrow tilt angle is used,
sea surface reflections cover a large area as illustrated below.
Sea surface
Tilt angle
indication
15°
Sea surface
reflections
Sea surface
15°
Figure 2-19 Sea surface reflections
Wake
A wake produced by own ship or another ship can be a strong
reflecting object when a narrow tilt angle is used. As the wake
appears as a thick continuous line, it can be easily distinguished
from a fish school. A wake contains many air bubbles which
attenuate ultrasonic energy, making it difficult to sound beyond
the wake.
Other
ship
Own
ship
Own ship’s
screw noise
Wake produced
by other ship
Own ship’s
screw noise
Own ship’s wake
(produced when
own ship turned)
Figure 2-20 Wake appearance on the display
2-21
False echo by sidelobe
An ultrasonic wave is emitted only in the direction set by the
TILT control, however there are some emissions outside the
main beam. These are called sidelobes. The energy of the
sidelobe is fairly weak but when the water is comparatively
shallow and the bottom is rocky and hard, strong signals are
detected by the sidelobe. These are represented on the display as a false echo as shown below.
Mainlobe echo
Sidelobe
Sidelobe echo
Mainlobe
The bottom echo
detected by sidelobe
appears at a certain
tilt angle when the
sidelobe points vertically. Also, poor
soundome projection
may result in a similar
false echo.
Figure 2-21 Sidelobe echoes
2-22
Noise and interference
When the fishing ground is crowded with many fishing boats,
the sonar is subject to interference from ultrasonic equipment
(echo sounder or sonar) on other boats as well as those on
own ship.
For instance, interference from the sonar operated on other
boats will show itself on the display as in (A) in the figure below. This interference can be suppressed by changing the Tx
rate on the SONAR menu. Noise from marine life shows itself
on the displays as in (B) in the figure below. This type of noise
can be suppressed with ”IR” in the SONAR menu.
(A) Inteference from
other sonars
(B) Interference from
marine life
Figure 2-22 Noise and interference
2-23
2.19 Sonar Mode Indications
Normal sonar display
Heading*
Sector center marker
Trackball marker
data
Range
Tilt
320°
Bearing
scale
North
marker*
Range
marker
2
Fish school
Current (tide)
vector
3
Own ship
marker
1
Trackball
marker
Bottom
echo
Bearing
marker
→
Range and bearing
marker data
→ 39
40
↓ 9
B 228°
D35.0
34° 43.261N
135° 20.282E
C1: 0.9
C2: 0.8
C3: 0.5
Depth, latitude, longitude
(Requires navigator)
*: Heading, north marker require current indicator
and gyro or log.
Courseline
(Requires
navigator or
current
indicator)
Current data
(Requires
current
indicator)
Figure 2-23 Indications on the normal sonar display
2-24
Expanded sonar display
Sector center marker
Trackball marker
data
R 150
T 10°
Range
Tilt
Sector width
marker
Own ship
marker
Trackball
marker
Figure 2-24 Indications on the expanded sonar display
2-25
2.20 Application Example
The figure below shows a typical sonar mode application.
Sonar (Horizontal) Mode
PURSE SEINING
3 Search for fish school
with RANGE and TILT
controls.
PWR
O I
TRANSDUCER
+
-
1 Power ON.
2 Lower soundome.
MODE
4
PWR
O
TRANSDUCER
+
-
MODE
PWR
O
6
8
2
TRANSDUCER
-
+
0
TRAIN
Go to 4 on
next page.
RANGE
10
GAIN
RANGE
After blinking, remains lit.
GAIN
: "3~5"
NOISE LIMITER : "2~4"
TVG(level & time) : "3~5"
TX POWER
:C
BOTTOM TRAWLING
Use these settings initially.
"Fine tune" as necessary.
1 Power ON.
PWR
O
2 Lower soundome.
TRANSDUCER
+
-
MODE
PWR
O
3 Observe bottom on the
screen.
Bottom
TRANSDUCER
-
+
Go to 4 on
next page.
RANGE
After blinking, remains lit.
For bottom trawling, sonar is usually used to detect net hangs ahead
rather than to detect fish close to the bottom, since bottom returns
usually mask the weaker fish targets close to the bottom. If the fish
school is dense enough and off the bottom they can be detected by
sonar.
2-26
Select the proper range and
tilt angle.
5 Change tilt angle for
strongest fish school
echo.
6 Monitor situation of both
fish school and net.
Fish
school
Scout-boat
Fish
school
Bottom
Here comes
fish school !
Net
4 Narrow the train area, and
track fish school.
Fish
school
Trackball
marker
5 Observe movement of fish
school and scout-boat.
Data for fish school pointed
by trackball marker (+).
4
Fish
school
Scoutboat
6
8
2
0
TRAIN
GAIN
SECTOR
TILT
FULL
HALF
EVENT
6 Set net around fish
school.
Net-boat
R/B
Adjust tilt angle and observe
both screens.
FULL
HALF
EVENT
Observe the net and the fish
school in it.
R/B
Marker can be
moved to any
position by rotating trackball.
4 Narrow the train area, and
track fish school.
Bottom
Fish
school
SECTOR
FULL
HALF
EVENT
5 Expand historical display
and observe bottom.
6 Change tilt angle, and tow
net.
Bottom
Fish
school
Outcrop
Outcrop
Trackball
marker
Data of fish school, bottom
or outcrop pointed by trackball
marker.
Here comes
fish school !
Outcrop !!
DO NOT FORGET TO RETRACT THE SOUNDOME
BEFORE TURNING OFF THE POWER !!
2-27
This page is intentionally left blank.
VERTICAL FAN MODE
3.1 Typical Operating Procedure
1 Turn on the display unit.
2 Lower the transducer.
PWR
O
3 Adjust the contrast and brilliance of the CRT.
TRANSDUCER
+
-
MODE
4 Set the MODE control to
RANGE
4
position.
5 Select the range desired with the RANGE control.
6
8
2
0
9
10
TRAIN
GAIN
SECTOR
TILT
6 Select the bearing of the vertical scanning with the TRAIN control.
7 Determine the center direction of the vertical scanning sector with
the TILT control and select the sector width with the SECTOR control.
8 Select the auto train sector on BOTTOM/3D menu, if necessary.
FULL
HALF
13
EVENT
9 Adjust the GAIN and TVG on the BOTTOM/3D menu ([Gain: 3-5,
TVG (level & time): 3]).
R/B
11
10 Adjust the NL control if a large number of small blue dots appear on
the screen. Normally set it between 2 and 4.
11 With the trackball marker, measure the horizontal or vertical distance
to a fish school or the bottom.
12 Reduce the output power if necessary. Normally, set it for maximum
position (C).
0
1
10 0
2 NL AUDIO
3
10 0
LEVEL TIME
TVG
CUSTOM MODE
0
10 0
10 0
10
13 The FULL/HALF key provides a quick change of the sector (120° or
180°).
ENTER
10
DIMMER BRILL
CH-37
HUE
3
E/S DEGAUSS
FAST TRACK
SCAN
V:H AUTO
RANGE TRAIN
BOTTOM MODE
MENU
8 9
MENU
Figure 3-1 Main panel and sub panel controls
3-1
3.2 Selecting Range
The RANGE control selects the detection (display) range. Select the range according to either the fish species being
searched or the depth desired. Normally it is set so that the
bottom is traced at the lower part of the screen (like an echo
sounder).
R 60
STBD 60
60 PORT
Surface
Horizontal
range
RANGE m
Vertical
range
Bottom
(V:H=1:1)
60
Range (m) 20
40
RANGE
+
60
280
320
400
Note: The unit of range measurement can be changed through
the SYSTEM menu. For details see page 6-1.
Figure 3-2 How to select range
V:H RANGE key
The V:H RANGE key changes the horizontal range scale in
two steps. See the figures below.
R
R
60
60
30
30
H
V
60
V:H=1:1
60
V:H=1:2
Figure 3-3 How the V:H RANGE key works
3-2
3.3 Selecting Bearing for the Vertical Fan
The TRAIN control determines the bearing of the vertical fan
beam. To which bearing the beam positions is known by the
train indicator mark.
Train Indicator Mark
Bow
Training of Vertical Fan Beam
Bow
TRAIN
The training of the fan beam depends on the status of the AUTO
TRAIN key in the sub panel 2.
Train Indicator Mark
AUTO TRAIN
[on]
[Example]
Auto Train Sector: 90°
Bow
[The beam
trains automatically within the selected
range centered at the
bearing set by
the TRAIN
control.]
(LED lights.)
AUTO TRAIN
[off]
(Manual train)
Training of Vertical Fan Beam
Bow
Bow
(LED goes
off.)
Manual train range can
be selected either HALF
(174°) or FULL (360°)
on the SYSTEM menu.
[The TRAIN control
can rotate the fan
beam to any bearing
desired. See V-MODE
MANUAL TRAIN on
page 6-2.]
3-3
3.4 Selecting the Display Sector
Sector center, width
The SECTOR and the TILT controls determine the display area
(sector width) and the display center (sector center) respectively.
Mode
Display Sector (transducer tilting sector)
Vertical Fan Mode
36°
60°
96°
120°*
156°*/180°*
* Selected by FULL/HALF key.
PORT
STBD
Display
sector
(Shaded area)
0°
180°
Sector center
Sector center
Figure 3-4 Selecting the display sector
Sector step
The FAST SCAN key in the sub panel 2 selects sector step in
6° or 3°.
3-4
3.5 Automatic Shifting of Own Ship Position
Own ship position on the screen is shifted automatically either
rightward or leftward according to the direction of the sector
center and the display sector width.
The figure below shows the own ship position has been shifted
rightward on the screen to provide the wider view at port side.
Display
sector
Sector
center
Figure 3-5 Automatic shift function
3.6 Rejecting Sonar Interference and Noise
While observing the picture, you may encounter occasional or
intermittent noise and interference as shown below. This is
mostly caused by onboard electronic equipment, engine, propeller noise, or electrical noise from other sonars being operated nearby. Turn on the interference rejector (IR) in the SONAR
menu to reduce or eliminate the interference.
Figure 3-6 Interference and noise
3-5
3.7 Horizontal, Vertical and Event Markers
(trackball operation)
The trackball functions to obtain the data (horizontal range and
depth) from own ship to the specified position on the screen
and, combined with the R/B and EVENT keys, switches the
Horizontal, Vertical and Event markers on/off.
Event
marker*
1) Position the trackball marker on the desired location.
Event marker*
Echo display area
2) Press the EVENT key.
3) To erase the marker, place the trackball marker outside
the echo display area and press the EVENT key.
Note: CH-37 stores one event marker.
Horizontal
and Vertical
markers
Vertical marker
Horizontal marker
Distance to the intersection
of the markers.
1) Position the trackball marker on the desired location.
2) Press the R/B key. The horizontal and vertical markers
appear and the distance to the intersection of the markers is indicated at the bottom left-hand side of the
screen.
3) To erase the marker, place the marker outside the echo
display area and press the R/B key.
* Requires navigation data.
(Continued on next page)
3-6
Function
Procedure/Purpose
Trackball
Data
Horizontal Range
Depth
Trackball data
Trackball marker
1) Position the trackball marker on the desired location.
2) Read the trackball data displayed at the upper left corner
of the screen.
3.8 Applying Proper TVG
The TVG function is the same as the one explained in the sonar mode. For best results, set both TVG level and time a little
lower than the ones in the sonar mode. The setting is mode on
the BOTTOM/3D menu screen and the usual setting for both
time and level is 3.
MENU
: SONAR
TVG LEVEL
:
3.0
TVG TIME
:
3.0
BEAM WIDTH
:
NAR
BOTTOM/3D
DUAL
E/S
Figure 3-7 Bottom/3D menu screen
TVG level rejects surface noise, which may mask shallow targets and TVG time adjusts the effective depth.
Level too low
Proper
Level too high
Time to high
Figure 3-8 Examples of proper and improper TVG
3-7
3.9 Bottom/3D Menu Operation
Basic procedure
1. Press the MENU key on the sub panel 2.
2. Select BOTTOM/3D with the arrow keys in the sub panel 2.
3. Select item and setting with the arrow keys. The selected
item is highlighted and the current setting is circumscribed
in white.
4. To return to the BOTTOM/3D menu, press the menu key
again.
MENU
: SONAR
TVG (LEVEL)
:
3.0
TVG (TIME)
:
3.0
BEAM WIDTH
:
NAR
WIDE
AUTO TRAIN SECTOR :
90
180
VERT. ECHO OVERLAY :
OFF
ON
3D VIEW SCALE
:
TIME
DIST
TIME SCALE
:
1/1
1/2
(or DISTANCE SCALE
500
1000)
EXIT
BOTTOM/3D
DUAL
E/S
360
1/4
: PRESS MENU KEY
Figure 3-9 Bottom/3D menu
Bottom/3D menu description
TVG (Level): Controls the receiver sensitivity in short to medium ranges to eliminate surface noise, which may mask shallow targets.
TVG (Time): Determines the TVG effective depth.
BEAM WIDTH: Sets the vertical beam width. Select narrow for
general use. The wide beam width is useful for searching a
wide area vertically but fish detection range is shortened since
the transmitted power attenuates.
AUTO TRAIN SECTOR: Sets the train sector; 90°, 180°, or
360°. Use a wide sector to conduct a general search, narrowing it once a fish school is detected.
VERT. ECHO OVERLAY: Turns the E/S combination display
on/off. (Requires external E/S.)
3-8
3D VIEW SCALE: Determines the depth item, time or distance
for 3D display mode. (Requires optional equipment.)
TIME SCALE or DISTANCE SCALE: Selects z-axis scale of
3D picture.
3.10 Interpreting the Display
This section provides the information necessary for interpreting the display.
How the picture is painted
The sounding beam is emitted and the information (target echoes) obtained by the beam appears in the corresponding sector as it appears on the sonar mode. The difference is that the
training is performed only in vertical direction. It forms a sounding area of a half-circle (like a slice of watermelon) to observe
a vertical section of underwater conditions.
The bearing of the vertical sounding beam can be selected
manually or automatically.
Sounding Beam
Vertical
Fan
Mode
(1) Bearing of the
sounding beam
0°
Screen Display
Freq: 60 kHz
(1) Bearing of the
sounding beam
TX
Bow
16°
180°
180°
13°
0°
Tilting direction
RX
16°
(2) Sector center
(3) Display area
13°
Select the bearing of the sounding beam (1) by TRAIN
control, the sounding sector center (2) by the TILT control
and the display area (3) by the SECTOR control.
(2) Sector center
(3) Display area
Figure 3-10 How the vertical fan picture is painted
3-9
Port-starboard picture (bottom)
You can see fish echoes at the center-right of the CRT. The
bottom is displayed wider as the distance from the ship’s position increases. Therefore, it may be difficult to discriminate bottom fish.
Own ship
PORT
STBD
Fish
school
Bottom
Figure 3-11 Port-starboard picture
When ship passes over fish schools
The sounding beam is directed fore-aft and the display is offcentered* to present a wider view of the area forward of the
ship. You can clearly see fish schools approaching from the
bow of the ship.
*: Automatically shifted according to the operation control settings.
Forward
Own ship
FORE
AFT
Fish school
FORE
AFT
Fish
school
Figure 3-12 Picture appearance when passing over fish schools
3-10
Display of net hauling
This is an example of net hauling display. The location of the
net is indicated clearly. (Ship is stopped.)
Own ship
Backward
FORE
AFT
Net
Figure 3-13 Net hauling and sonar picture
False echo
In a shallow water (less than 100 m) detection, unwanted echoes shown in the figure may appear. This phenomenon is
caused by the false echo from the previous transmission. Reducing the Tx rate on the BOTTOM/3D menu may lessen this
effect.
Fish
Bottom
False echo
Range
Figure 3-14 False echoes
TIP! Training indicator and screen display.
Starboard-port
PORT
STBD
Fore-aft
AFT
FORE
Aft-fore
FORE
AFT
¡Shows starting position of the sounding beam.
3-11
3.11 Vertical Fan Mode Indications
Heading
Train indicator
H-Range
Trackball
data
V-Range
H-Range
scale
Fish schools
Net mouth
mark
Trackball
Bottom
2nd reflection
V-Range scale
Vertical/Horizontal
marker data
Figure 3-15 Indications in the vertical fan mode
3-12
3.12 How to Use the Vertical Fan Mode
[1] TRAWLER (Surface/Mid-water/Bottom)
Usage
Auto train
Fish school detection
Bottom shape discrimination
Relation between fish school and fishing gear
1 Turn on the AUTO TRAIN key on the sub panel 2 and set the
direction of the train center to the fore-aft direction. Observe
the fish school near the bow of the ship, or inspect the bottom contour.
Shoal
Fish
schools
2 After detecting a fish school, steer the boat toward that
direction, turning off the "AUTO TRAIN" to observe that
direction.
Bow
Steered
angle
3 When approaching the fish school, change the beam direction to port-starboard by the TRAIN control and maneuver
the boat so that the fish are led into the trawl net.
4 To observe the hauling of the net, turn the sounding beam to
the fore-aft direction.
Net
Figure 3-16 Vertical fan mode usage in trawling
3-13
[2] PURSE SEINER
Usage
Tracking fish
Observation of fish movement/bottom shape
Confirmation of net forming
1 Approach the fish school while observing their distribution on
the sonar mode.
2 While approaching, face the sounding beam toward the fish
schools and confirm their distribution. The display shown
below is off-centered* to obtain a wider view of the starboard
side.
Fish
school
*Automatically shifted.
3 Shoot the net, and then observe the location of the fish and
the status of the net.
Fish
school
Net
Figure 3-17 Vertical fan mode usage on purse seiner
3-14
3D MODE
The 3D mode shows vertical echoes (real time echoes) and a
frontal or oblique image of the bottom just passed, like a graphic
track plotter. This mode is useful for locating a wreck, a shoal
or a fishing reef. Vertical echoes can be turned on/off through
the BOTTOM/3D menu.
4.1 Selecting a 3D Display
Either of two displays may be selected with the MODE control:
the frontal image at “ ” position, or the oblique image at “ ”.
Example displays of both images are shown below.
Frontal image
The frontal image picture gives a view of the bottom as if you
are looking at it through a rearview mirror. That is, the most
recent data appears at the front if the picture.
Heading
Train indication
H-range
V-range
H-range scale
Trackball
data
Vertical echoes
(real-time echoes)
Figure 4-1 Frontal image
4-1
Oblique image
The oblique image is the equivalent of the frontal image rotated by 45° counterclockwise.
Own position
Sectional
view
Figure 4-2 Oblique image
4.2 Turning Vertical Echoes On/Off
Vertical echoes, namely, real time echoes, can be turned on or
off on the VERT. ECHO OVERLAY field of the BOTTOM/3D
menu, which you can display by pressing the MENU key on
the sub panel 2.
MENU
: SONAR
VERT. ECHO OVERLAY :
OFF
ON
3D VIEW SCALE
:
TIM
DIST
TIME SCALE
:
1/1
1/2
(or DISTANCE SCALE
500
1000)
EXIT
: PRESS MENU KEY
Figure 4-3 Bottom/3D menu
4-2
BOTTOM/3D
DUAL
E/S
1/4
4.3 Changing 3D View Scale Mode and Scale Selection
The depth (z-axis) of the graph is displayed in either “TIMe” or
“DISTance” scale mode. The depth can be set to 500 or 1000
meters in the distance scale mode, or 1/1, 1/2 or 1/4 in the time
scale mode. The fraction means graph update/number of transmission. “1/4,” for example, means the graph is updated every
four transmissions.
These selections are made on the 3D VIEW SCALE and TIME
SCALE (or DISTANCE SCALE) lines of the BOTTOM/3D menu.
The time mode should be selected when speed data is not
being fed to the unit from navaids or speed log.
Depth
Depth
Frontal image
Oblique image
Figure 4-4 Depth dimension in frontal and oblique images
4.4 Other Operations
The following operations are the same as those in the Vertical
Fan mode.
• Range Selection
• Rejecting Sonar Interference and Noise
• Horizontal, Vertical and Event markers
• TVG Adjustment
• Beam Width Selection
The selection of the bearing of the vertical fan beam and auto
train function are disabled, as the bearing of the vertical fan
beam is automatically selected to 90° in this mode.
4-3
This page is intentionally left blank.
CUSTOM MODE KEYS (¡, ™, £)
5.1 About the Custom Mode Keys
Like the redial feature on a telephone, the custom mode keys
record control settings and play them back in a single key stroke.
This feature is useful when you need to quickly set up the sonar according to fishing ground or fish species being searched.
You can program three sets of settings for the MODE, RANGE,
SECTOR, TRAIN and TILT controls.
5.2 Customizing the Keys
1. Tune the sonar as you normally would.
2. Press the ENTER key to display the CUSTOM MODE menu.
3. Press one of ¡, ™ or £ key (contents shown in second
column from the left in figure below).
[CUSTOM MODE menu]
ITEM
MODE
RANGE
SECTOR
TRAIN
TILT
SETTING CUSTOM1 CUSTOM2 CUSTOM3
FAST
60
0°
180°
96°
4. Repeat step (2) for remaining custom mode keys.
Note: Custom mode key labels are provided on page AP-1.
Cut them out and insert them in the label cases on the
front panel. See the illustration on the next page for how
to insert them.
5-1
5.3 Custom Mode Operation
1. Press desired custom mode key ¡, ™ or £.
2. To escape from the custom mode settings, adjust any controls.
[Example]
FISHING GROUND
TILT
SECTOR
FULL
HALF
MODE
RANGE 200 m
SECTOR 360°
TRAIN
0°
TILT
30°
MODE
RANGE 100 m
SECTOR 180°
TRAIN
90°
TILT
90°
MODE
RANGE
SECTOR
TRAIN
TILT
EVENT
R/B
Fold here
Record settings on label and insert
it in label case on front panel.
1
2
CUSTOM MODE
3
ENTER
CH-37
5-2
MENU SETTINGS
6.1 System Setting Menu
1. Turn on the power while pressing the MENU key. Release
the key when you hear a beep. The SYSTEM menu appears.
** SYSTEM SETTING **
3D DISPLAY
SHIP’S POSITION
CURRENT DATA
DEPTH DATA
HEADING INDICATION
NORTH MARK
TRACK
HDG/SPD DATA
NAV DATA
:
:
:
:
:
:
:
:
:
DATA FORMAT FOR NAV2
CIF BAUD RATE
TVG CORRECTION
UNIT
V-MODE MANUAL TRAIN
DEGAUSSING INTERVAL
FACTORY SETTING
:
:
:
:
:
:
:
OFF
ON
OFF
L/L
LOP
OFF
FLOW FROM FLOW TO
OFF
ON
OFF
TRUE
AZ
OFF
ON
10R
20R
NAV
CI
GPS
LORAN C
LORAN A
DR
DECCA
OTHERS
NMEA
CIF
1200
2400
4800
OFF
1/2
1
m
ft
fa
HIRO
HALF
FULL
30 SEC
NO
YES
EXIT : PRESS MENU KEY
Default settings circumscribed.
Figure 6-1 SYSTEM SETTING menu
2. Select SYSTEM SETTING and press the MENU key.
3. Select items with up and down arrow keys; options with left
and right arrow keys.
4. Press the MENU key to return to the system menu.
Note: Be sure to return to the system menu before turning
off the power, to properly register settings.
5. To return to normal operation, reset the power.
See the next page for SYSTEM SETTING menu description.
6-1
Table 6-1 System setting menu description
Item
Description
3D DISPLAY
Turns 3D display on/off.
SHIP'S POSITION
Turns position indication on/off and selects position format; latitude
and longitude or Loran LOP.
CURRENT DATA
Turns current (tide) data display method; flow from, flow to or off.
HEADING DISPLAY
Turns heading indication on/off and selects its format; true or
azimuth.
NORTH MARK
Turns north marker on/off.
TRACK
Selects length of courseline plotting; 10R (ten times the range in use)
or 20R (twenty times the range in use).
HDG/SPD DATA
Selects source of data to be used to plot courseline; NAV (Navigator),
CI (Current Indicator).
NAV DATA
Selects source of position data; GPS, LORAN C LORAN A, DR,
DECCA, OTHERS.
DATA FORMAT FOR NAV2
Selects data format for nav data; CIF (FURUNO) or NMEA.
CIF BAUD RATE
Selects baud rate of CIF data; 1200, 2400, 4800 bps.
TVG CORRECTION
Changes TVG curve to compensate for absorption attenuation of
ultrasonic wave in water. OFF, Standard TVG curve, 1/2, 1/2 of
theoretical absorption value added to TVG curve, 1, Full theoretical
absorption value added to TVG curve.
UNIT
Selects unit of depth measurement. m, meters; ft, feet; fa, fathoms,
HIRO.
V-MODE MANUAL TRAIN
Selects manual training sector width for the Vertical Fan mode. Half,
half circle, Full, full circle.
DEGAUSSING INTERVAL
Selects screen degaussing interval.
FACTORY SETTING
Yes restores default system menu settings.
6.2 Screen Adjustment
Screen size and position can be adjusted as follows:
1. Turn on the power while pressing the MENU key to display
the SYSTEM menu.
2. Select SCREEN ADJUSTMENT.
3. Press the MENU key.
6-2
** SCREEN ADJUSTMENT **
H.SIZE
H. POSITION
V. SIZE
V. POSITION
DEFLECTION DIST.
BRIGHTNESS
EXIT : PRESS MENU KEY
Effective picture
marker (inside)
Effective picture
marker (outside)
Figure 6-2 Screen adjustment screen
4. Select item with up and down arrow keys.
5. Adjust item with left and right arrow keys:
H.SIZE:
Sets picture size in horizontal direction. [→], increases size; [←], decreases size.
H. POSITION:
Adjusts picture position in horizontal
direction. [→], [←] shift right, left,
respectively.
V.SIZE:
Sets picture size in vertical direction. [→], increases size; [←], decreases size.
V. POSITION:
Adjusts pictureposition in vertical
direction. [→], [←] shift right, left,
respectively.
DEFLECTION DIST: Adjust deflection in vertical direction. Adjust [→], [←] to obtain
square picture.
BRIGHTNESS:
Adjust CRT brilliance. [→], brighter;
[←], dimmer.
5. To return to the SYSTEM menu, press the MENU key.
6-3
6.3 System Menu
Press the MENU key while turning on the power. The SYSTEM
menu appears.
** SYSTEM MENU **
SYSTEM SETTING
RANGE - SONAR MODE
RANGE - VERTICAL FAN MODE
RANGE/SHIFT - E/S
COLOR
LANGUAGE
DISPLAY TEST1 - ROM/RAM/KEY
TRAIN/TILT TEST
SCREEN ADJUSTMENT
TEST PATTERN
DISPLAY TEST2 - OPERATION
DEFAULT
EXIT: TURN OFF THE UNIT
Figure 6-3 System menu
Range - sonar mode menu
1. Select RANGE-SONAR MODE from the SYSTEM menu.
2. Press the MENU key.
** RANGE - SONAR MODE **
1
2
3
4
5
6
7
8
9
10
11
12
:
:
:
:
:
:
:
:
:
:
:
:
FACTORY SETTING :
50
100
150
200
250
300
400
500
600
800
1200
1600
NO
YES
EXIT : PRESS MENU KEY
Figure 6-4 Range - sonar mode menu
6-4
3. Select range.
4. Set range.
5. To return to the SYSTEM menu, press the MENU key.
6. To quit, reset the power.
Range - vertical fan mode
1. Select RANGE-VERTICAL FAN MODE from the SYSTEM
menu.
2. Press the MENU key.
** RANGE - VERTICAL FAN MODE **
1
2
3
4
5
6
7
8
9
10
11
12
:
:
:
:
:
:
:
:
:
:
:
:
20
40
60
80
100
120
160
200
240
280
320
400
FACTORY SETTING :
NO
YES
EXIT : PRESS MENU KEY
Figure 6-5 Range - vertical fan mode menu
3. Select range.
4. Set range.
5. To return to the SYSTEM menu, press the MENU key.
6. To quit, reset the power.
6-5
Range/shift - e/s
1. Select RANGE/SHIFT - E/S from the SYSTEM menu.
2. Press the MENU key.
** RANGE/SHIFT - E/S **
RANGE 1
2
3
4
5
:
:
:
:
:
40
80
160
240
320
SHIFT
:
:
:
:
:
20
20
40
80
80
1
2
3
4
5
FACTORY SETTING :
EXIT
:
NO
YES
PRESS MENU KEY
Figure 6-6 Range/shift - e/s screen
3. Select range (shift).
4. Set range (shift).
5. To return to the SYSTEM menu, press the MENU key.
6. To quit, reset the power.
6-6
Color setting
The color setting screen allows you to adjust display colors.
1. Select COLOR from the SYSTEM menu.
2. Press the MENU key.
** COLOR **
LEVEL
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
: R
: 11
: 13
: 15
: 15
: 14
: 14
: 14
: 13
: 11
:0
:0
:0
:0
:0
:0
G
0
0
0
4
6
9
11
13
13
13
12
11
10
8
6
B
0
0
0
0
0
0
0
0
0
0
9
11
12
12
12
FACTORY SETTING :
HUE 1
TEXT
BKGD
MENU
:R
:11
:0
:0
G
11
0
0
B
11
0
9
HUE 2
TEXT
BKGD
MENU
:R
:15
:0
:0
G
15
0
0
B
15
9
12
HUE 3
TEXT
BKGD
MENU
:R
:15
:0
:0
G
15
0
0
B
15
11
15
NO
YES
EXIT : PRESS MENU KEY
Figure 6-7 Color setting screen
3. Select color.
4. Set color.
5. To return to the SYSTEM menu, press the MENU key.
6. To quit, reset the power.
6-7
Factory setting menu (restoring default settings)
1. Select DEFAULT from the SYSTEM menu.
2. Press the MENU key.
** DEFAULT **
ARE YOU SURE? :
NO
YES
EXIT : PRESS MENU KEY
NOTE! ALL SETTINGS INCLUDED IN SYSTEM MENU
WILL BE CHANGED TO FACTORY SETTING
Figure 6-8 Default screen
3. Select YES and press the MENU key to restore default settings.
4. To return to the SYSTEM menu, press the MENU key.
5. To quit, reset the power.
Display test - operation
1. Select DISPLAY TEST - OPERATION from the SYSTEM
menu.
2. Press the MENU key. TEST appears on the screen while
the display unit is being tested.
3. To quit, reset the power.
6-8
6.4 Dual Menu
Press the [MENU] and choose DUAL to open DUAL menu.
MENU
: SONAR
DUAL MODE
:
E/S
NET MOUTH SHIFT :
1
NET MOUTH WIDTH :
100
NET MOUTH HEIGHT :
30
AUTO
BOTTOM/3D
BOTTOM
NET DEPTH
:
MANUAL
HOR SCAN RATE
:
1
VER SCAN PATE
:
1
EXIT
: PRESS MENU KEY
DUAL
E/S
SONAR
OFF
Description of DUAL menu
DUAL MODE: Choose the display to show on the lower 1/3 of
the combination display. E/S: Echosounder, BOTTOM: Vertical Fan, SONAR: Sonar picture from the CH-37 is displayed
like an echosounder picture. The default setting is E/S.
NET MOUTH SHIFT: Set the left/right position of the net mouth
mark. The setting range is -999 to +999 (m) and the default
setting is 0 m. (Setting range and default setting change with
unit of measurement.)
NET MOUTH WIDTH: Set the left/right width of the net mouth
mark. The setting range is 1-999 (m) and the default setting is
100 m. (Setting range and default setting change with unit of
measurement.)
NET MOUTH HEIGHT: Set the up/down width of the net mouth
mark. The setting range is 1-999 (m) and the default setting is
30 m. (Setting range and default setting change with unit of
measurement.)
NET DEPTH: Choose the net mouth mark depth setting method.
The default setting is AUTO. AUTO: Use the IEC/NMEA depth
data sentence DBS. MANUAL: Set the depth with the [↑] or [↓]
key on the sub panel.
HOR SCAN RATE: Set the horizontal scan rate for the combination mode; that is, the number of horizontal scans produced
per line drawn in the combination display. The setting range is
1-10 and the default setting is 1.
VER SCAN RATE: Set the vertical scan rate for the combination mode. that is, the number of vertical scans produced per
line drawn in the combination display. The setting range is 110 and the default setting is 1.
6-9
(This page intentionally left blank.)
6-10
MAINTENANCE & TROUBLESHOOTING
Good performance depends on regular maintenance. Following the recommended procedures in this chapter will keep the
equipment operating in top condition for years to come.
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel
should work inside the
equipment.
7.1 Maintenance of Display Unit
• Handle with care. Corrosion may start even from a scratch.
• Allow space around the unit for ventilation.
• Keep it away from equipment with magnets (such as a
speaker, large capacity transformer) and also magnetic-sensitive units such as gyrocompass or cassette tape.
• Clean the filter and screen with a wet or dry soft cloth. Do
not use commercial cleaners to clean the display unit —
they can remove paint and markings.
• Cover the display unit when it is not in use.
• Degauss the display with the DEGAUSS key when picture
color is abnormal.
7.2 Maintenance of Transceiver Unit
Keep the unit clean, especially the cable entrance. Wipe off
dust or oil with a cloth dampened in water-diluted mild detergent.
7-1
7.3 Maintenance of Hull Unit
Lubrication
Grease the raise/lower screw shaft once a year. Also, grease
the raise/lower main shaft (upper part of the grease cotton retainer) twice a year. These parts can accessed by removing
the raise/lower drive assembly cover.
Manual raise/lower of transducer with hand crank
Ship’s mains should be supplied to the hull unit to do this check.
Also be sure to press and hold down the brake-off switch while
manually raising/lowering the transducer. Failure to press the
switch may damage the raise/lower motor.
1. Turn off the breaker on the hull unit.
2. Remove the brake-off switch cover.
3. Set 19 mm socket wrench and turn it while pressing the
brake-off switch.
4. Check that the transducer can be raised/lowered smoothly
with a constant force from the upper to the lower limit positions. If not, centers of the main body flange and the retraction tank are not aligned. Adjust the hull unit mounting
position.
Brake-Off
switch
Raise
Lower
Breaker
Figure 7-1 Using the hand crank
7-2
7.4 Display Unit Test
This test checks the ROM, RAM and keyboard for proper operation.
1. Turn on the power while pressing and holding down the
MENU key. Release the MENU key when you hear a beep.
The SYSTEM menu appears as shown below.
** SYSTEM MENU **
SYSTEM SETTING
RANGE - SONAR MODE
RANGE - VERTICAL FAN MODE
RANGE/SHIFT - E/S
COLOR
LANGUAGE
DISPLAY TEST1 - ROM/RAM/KEY
TRAIN/TILT TEST
SCREEN ADJUSTMENT
TEST PATTERN
DISPLAY TEST2 - OPERATION
DEFAULT
EXIT: TURN OFF THE UNIT
Figure 7-2 System menu
2. Select DISPLAY TEST1 - ROM/RAM/ KEY with the arrow
keys on the sub panel 2.
3. Press the MENU key to start the test. The program no., Tx
frequency, and pitch and roll angles are displayed, and the
ROM, RAM, SI/O are checked.
4. Operate each key and control on the main panel, sub panel
and remote control box. A pressed key’s on-screen indication changes to 1 when the key is pressed; 0 when it is
released.
5. To return to the SYSTEM menu, press the MENU key again.
6. To quit, reset the power.
7-3
** DISPLAY TEST **
ROM Program version
NO. is displayed, ROM
RAM and serial ports
are checked for proper
operation, and Tx frequency, roll angle and
pitch angle are displayed.
Remote Control
Box check. Switch
is normal if value
changes when
switch is operated.
PROGRAM NO. 0650101-xxx
ROM
OK
SRAM
OK
VRAM
OK
SIO1
OK
SIO2
OK
TX FREQUENCY 60KHZ
ROLL
0
PITCH
0
REMOTE CONTROL
0
0
0
0
0
0
0
0
0
0
0
0
0
0
MAIN PANEL
*
*
*
12
12
0
255
12
0
0
0
0
X: 0
Y: 0
0
0
0
0
SUB PANEL
255 255 255 *
*
*
0
0
0
0
0
0 0
0
EXIT
0
0 0
EXIT : PRESS MENU KEY
Figure 7-3 Display unit test results
7-4
Main panel
check. Switch is
normal if value
changes when
switch is operated.
Sub panel
check. Switch is
normal if value
changes when
switch is operated.
7.5 Train/Tilt Test
This test checks the transducer training and tilting functions for
proper operation.
1. Turn on the power while pressing and holding down the
MENU key.
2. Select TRAIN/TILT TEST with the arrow keys in the sub
panel 2.
3. Press the MENU key to start the test.
4. To return to the SYSTEM menu, press the MENU key again.
5. To quit, reset the power.
** TRAIN / TILT TEST **
-- PHOTO SENSOR CHECK -TRAIN
TILT
0°
OK
+10° OK
180°
OK
90° OK
190° OK
This checks the photo sensors which detect the reference angles for training
and tilting operations.
-- TRAIN CHECK -0
180
0
180
→ 180° ( CW)
→ 0° ( CW)
→ 180° (CCW)
→ 0° (CCW)
PULSES NG
1428
0
1449
0
1427
0
1451
0
-- TILT CHECK -+10
90
190
90
→ 90°
→ 190°
→ 90°
→ +10°
PULSES NG
1206
0
0
939
0
919
0
1225
TEST COUNT =
This checks the transducer
training operation. The four
digit figures show the number of pulses used to train
the transducer by 180.
If training is abnormal, NG
(No Good) count increases
by one.
This checks the transducer
tilting operation. If the number of pulses used to tilt the
transducer is abnormal, NG
count increases by one.
8
EXIT : PRESS MENU KEY
Figure 7-4 Train/tilt test results
7-5
7.6 Test Pattern
This test checks display position and colors.
1. Turn on the power while pressing and holding down the
MENU key.
2. Select TEST PATTERN with the arrow keys in the sub panel
2.
3. Press the MENU key to start the test.
BLACK
RED
GREEN
BLUE
Position check
Figure 7-5 Test pattern
4. To return to the SYSTEM menu, press the MENU key again.
5. To quit, reset the power.
7.7 Error Messages
Raise/lower error message
If the power is not applied to the hull unit, the following message appears on the screen and the buzzer sounds.
HULL UNIT
POWER OFF
(CHECK BREAKER AND FUSE)
PRESS R/B KEY TO SILENCE ALARM
Figure 7-6 Raise/lower error message
If this occurs, turn the power off and check the breaker and
fuse as the screen suggests.
7-6
Transceiver unit error message
If the power is not supplied to the transceiver unit, the following
message appears on the screen and the buzzer sounds.
TRANSCEIVER
UNIT
POWER OFF
(CHECK FUSE ON TRANSCEIVER UNIT)
PRESS R/B KEY TO SILENCE ALARM
Figure 7-7 Transceiver unit error message
If this occurs, turn the power off and check the fuse as the
screen suggests.
Speed warning
Because the transducer may be damaged if it is kept lowered
when ship’s speed exceeds 15 knots (based on the speed relative to ground fed from nav sensor), the following message
appears and the buzzer sounds.
Press the R/B key to silence the buzzer and return to the normal sonar picture. Raises the transducer.
TRANSDUCER
REMAINS
LOWERED
(REDUCE SHIP’S SPEED AND PRESS ↑ KEY)
PRESS R/B KEY TO SILENCE ALARM
Figure 7-8 Speed warning
7-7
Train error message
If something is wrong with the train control circuit, the following
message appears and the unit stops operating. Turn the PWR
switch off and contact your service agent at your earliest convenience.
TRAIN NG
Figure 7-9 Train error message
Tilt error message
If something is wrong with the tilt control circuit, the following
message appears and the unit stops operating. Turn the PWR
switch off and contact your service agent at your earliest convenience.
TILT NG
Figure 7-10 Tilt error message
7-8
7.8 Troubleshooting Table
The table below provides common symptoms of equipment
troubles and the means to rectify them. If normal operation
cannot be restored, do not check inside the system. Any repair
work is best left to a qualified technician.
Symptom
No picture
Check
Power supply.
Check ship’s mains voltage at the
power plug connected to the power
unit.
FUSE
Fuse.
If blown, replace with 10A fuse. Call
service technician if it blows again.
NEVER use a fuse of a higher rating.
1+
23 SHIELD
POWER CABLE
Bottom echo becomes
irregular
Rough seas.
Distance to sea bottom changes due
to rolling and pitching.
Long range selected.
Since transmission period is a little
longer, ship’s rolling and pitching are
apt to effect detection of echo.
Weak echo
TX OUTPUT POWER set to other than
"C."
Check the TX OUTPUT POWER
setting on the SONAR menu, and
set it to "C" for max. output power.
MENU
: SONAR
TX RATE
:
TX PULSE LENGTH : LONG
TX OUTPUT POWER :
BOTTOM/3D
E/S
10
SHORT
A
B
C (MAX)
TVG effect is excessive.
Excessive TVG results in elimination
of useful echoes.
Note: Readjustment of TVG is
required whenever the GAIN
control is adjusted.
Somewhat strange color
0
10 0
10
LEVEL TIME
TVG
BRILL control set too low.
Increase the brightness.
0
10
BRILL
(Continued on next page)
7-9
Symptom
Color partially irregular
Check
Magnet is near the screen.
This symptom occurs if equipment
which contains a magnet (loudespeaker, etc.) is placed near the
screen. Check to see if the degaussing circuit is turned off on the SYSTEM SETTING menu. See page 62.
Note: If not cleared, consult with
electronics technician.
Picture distorted
Equipment generating strong magnetic field is near display unit.
Locate magnetic field generating
equipment (rectifier, etc.) well away
from the display unit.
Picture contains noise
Equipment not grounded properly.
Carefully check the ground.
Display Unit
Power cable is run alongside the
signal cable.
Signal cable may pick up noise emitted from power cable of other equipment; therefore, separate them from
each other.
Signal cable
Debris may be on sea surface.
Reject unwanted echoes with the
interference rejector on the SONAR
menu, TVG control or NL control.
7-10
Transceiver
Unit
Copper
plate
Power cable
of other set
Separate
physically
CUSTOM MODE KEY LABELS
(FRONT)
(BACK)
MODE
RANGE
SECTOR
TRAIN
TILT
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
Fold here
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
FISHING GROUND
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
200m
0°
360°
30°
FISHING GROUND
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
100m
180°
Cut out label, record settings on label,
fold in half and insert in label case.
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
200m
0°
225°
30°
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
FISHING GROUND
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
AP-1
MODE
RANGE
SECTOR
TRAIN
TILT
MODE
RANGE
SECTOR
TRAIN
TILT
SPECIFICATIONS OF COLOR SECTOR SCANNING SONAR
CH-37
1. GENERAL
(1) Display System
PPI display on high resolution 15”(381mm) color CRT
(2) Picture Color
16 or 8 color depending on signal strength
(3) Display Mode
1) Normal sonar mode display*
2) Expanded sonar mode display
3) Vertical fan mode display*
4) 3D mode display (front view)
5) 3D mode display (slant view)
*: E/S combination display is optionally available in modes 1) and 3).
Optional external E/S interface is required.
(4) Range/Train Speed
Detection Range (m)
Range
Train Speed **
(sec./360°)
60 kHz
162 kHz
1
0-50
0-50
3.8
2
0-100
0-100
4.3
3
0-150
0-150
4.8
4
0-200
0-200
5.4
5
0-250
0-250
6.0
6
0-300
0-300
6.7
7
0-400
0-350
7.6
8
0-500
0-400
8.6
9
0-600
0-450
10.0
10
0-800
0-500
12.0
11
0-1200
0-600
16.0
12
0-1600
0-800
21.0
**: Measured at fast train mode of 60 kHz (reference only).
Display sector width is selected among 45°, 90°, 135°, 180°, 225° and 360° by horizontal, 36°, 60°, 96°,
120°, 156° and 180° by vertical.
2. DISPLAY UNIT
(1) Display System
PPI display on high resolution 15”(381mm) color CRT
(2) Color Hue Control
LOG, linear, square
(3) Contrast
Variable
(4) Display Mode
Vertical Mode, Slice Mode, 3D Mode
(5) Unit Indication
m, ft, fa
SP - 1
(6) Horizontal Range
12 steps during 30 m to 1600 m
(7) Vertical Range
12 steps during 10 m to 800 m
(8) E/S Range*
5 steps during 10 m to 800 m
(9) E/S Shift*
1000 m max.
(10) Offcenter
4 point at Expand mode, according to the train setting
2 point at Slice mode, according to the tilt setting
(11) TVG
Level(100 dB max.), Range(1000 m max.)
(12) Clutter
Variable, Hue control
(13) Elimination Interference
Correlation with before data
(14) Audio Monitor
2 W, 4 ohms using external speaker SC-05WR(option)
*: Optional external E/S interface is required.
3. TRANSCEIVER
(1) Frequency
60/162 kHz selected by internal settings
(2) Output Power
0.8 kW(60 kHz), 1.5 kW(162 kHz)
(3) Beamwidth
-6 dB,
(4) Pulselength
0.2 to 10.6 ms, varied according to the range in use
(selected on the Menu)
4. HULL UNIT
(1) Train Step
45° step by fast scan mode or 6° step by normal mode
(2) Tilting
Horizontal mode
Tilt Range: +5° to 90°, Tilt Step: 1° step
Vertical Fan Mode
Tilt Range: 0° to +180°, Tilt Step: 6°(fast scan) or 3°(normal)
(3) Transducer Travel
400 mm
(4) Raise/Lower Time
10 sec approx. (24/32 VDC)
(5) Allowable Ship’s Speed
18 knots or less
(15 knots during raise/lower operation)
5. POWER SUPPLY AND CONSUMPTION
(1) Display Unit
24/32 VDC (20 to 41.6VDC), 140 W approx. or
100/110/200/220 VAC, 50/60 Hz , 1
(2) Transceiver Unit
24/32 VDC (20 to 40 VDC), 50 W approx. or
100/110/200/220 VAC, 50/60 Hz , 1
(3) Hull Unit
24/32VDC, 50 W approx. (150 W while traveling)
AC spec. set requires rectifier RU-1746B-2
SP - 2
6. ENVIRONMENTAL CONDITION
(1) Ambient Temperature
0°C to 50°C
(2) Relative Humidity
95% or less (at 40°C)
7. CORTING COLOR
(1) Display Unit
Chassis: 2.5GY5/1.5
Panel: N-3.0
(2) Hull Unit
2.5GY5/1.5
(3) Transceiver Unit
2.5G7/2
SP - 3
INDEX
¡, ™, £ keys (custom mode keys) 5-1–5-2
G
3D mode 4-1–4-3
3D view scale (time, distance) 4-3
GAIN control 2-7
A
H
AUDIO control 2-9
AUTO TRAIN key 3-3
Auto train sector (vertical fan mode) 3-8
Horizontal marker 3-6
HUE key 1-6
Hull unit care 7-2
B
I
Background color 1-6
Beamwidth (vertical fan mode) 3-8
Bottom/3D menu 3-8
BRILL control 1-3
Indications
sonar mode 2-24–2-25
vertical fan mode 3-12
IR control
sonar mode 2-8
vertical fan mode 3-5
C
Color adjustment 6-7
Color quantity 2-16
Custom mode key labels AP-1
Custom mode keys (¡, ™, £) 5-1–5-2
D
K
Keying pulse synchronization 2-17
M
Default menu settings 8-9
DEGAUSS key 1-6
DIMMER control 1-3
Display unit care 7-1
Display unit test
operation 6-8
ROM, RAM, keyboard 7-3
Main panel description 1-1
Maintenance
Display unit 7-1
Hull unit 7-2
Transceiver unit 7-1
Menu tree vii
MODE control 1-4
Motion Sensor MS-100 2-16
E
N
E/S key 1-2, 1-5
E/S menu 2-17
Echo resolution
Sonar mode 2-16
E/S mode 2-18
ENTER key 1-2, 5-1
Error messages 7-6–7-8
EVENT key
sonar mode 2-10
vertical fan mode 3-6
Event marker
sonar mode 2-10
vertical fan mode 3-6
NL control 2-8
F
FAST SCAN key
sonar mode 2-3
vertical fan mode 3-4
FULL/HALF key 2-11
O
Output power 2-12, 2-16
P
Presentation mode 1-4
Pulselength 2-12, 2-15
PWR switch 1-3
R
R/B key
sonar mode 2-10
vertical fan mode 3-6
R/B marker 2-10
Raise/lower error message 7-6
RANGE control
sonar mode 2-2
vertical fan mode 3-2
Index-1
Range preset
e/s mode 6-4
sonar mode 6-4
vertical fan mode 6-5
S
Screen adjustment 6-2
SECTOR control
sonar mode 2-3
vertical fan mode 3-4
Sonar menu 2-15
Speed warning 7-7
Sub panel description 1-2
System configuration vi
System menu 6-4
System setting menu 6-1
T
Test pattern 7-6
Tilt angle 2-4
TILT control
sonar mode 2-4, 2-14
vertical fan mode 3-4
Tilt error message 7-6
TRACK key 2-17
TRAIN control
sonar mode 2-15
vertical fan mode 3-3
Train error message 7-8
Train/tilt test 7-5
Transceiver unit care 7-1
Transceiver unit error message 7-7
TRANSDUCER switches 1-3
Troubleshooting
display unit test 7-3
error messages 7-6
test pattern 7-6
train/tilt test 7-5
troubleshooting table 7-9
TVG control
sonar mode 2-13
vertical fan mode 3-7, 3-8
Tx rate 2-15
Tx rate adjustment 2-8
V
V:H RANGE key 3-2
Vertical marker 3-6
Index-2