COLOR LCD SEARCHLIGHT SONAR CH-250
Your Local Agent/Dealer 9-52 Ashihara-cho, Nishinomiya, Japan Telephone : 0798-65-2111 fax 0798-65-4200 : All rights reserved. Printed in Japan FIRST EDITION : MAR. 2000 L PUB.No. OME-13160 ( DAMI ) CH-250 : NOV.
SAFETY INSTRUCTIONS WARNING ELECTRICAL SHOCK HAZARD WARNING Keep heater away from equipment. Do not open the equipment. Only qualified personnel should work inside the equipment. A heater can melt the equipment's power cord, which can cause fire or electrical shock. 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. Continued use of the equipment can cause fire or electrical shock.
CAUTION Do not exceed 20 knots when operating the equipment and do not exceed 15 knots when lowering or raising the transducer. The transducer may become damaged. Do not use the equipment for other than its intended purpose. Use of the equipment as a stepping stool, for example, may result in personal injury or damage to the equipment. Warning labels are attached to the display, transceiver and hull units. Do not remove the labels. If a label is missing or illegible, contact a FURUNO agent or dealer.
TABLE OF CONTENTS FOREWORD ................................................................................................ v SYSTEM CONFIGURATION ..................................................................... vii 1. OPERATIONAL OVERVIEW .............................................................. 1-1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Control Description.................................................................................................. 1-1 Remote Controller ...........................
4. ECHO SOUNDER MODE ................................................................... 4-1 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 Operational Overview.............................................................................................. 4-1 Typical Echo Sounder Display................................................................................. 4-2 Selecting the Range................................................................................................ 4-3 Train Direction....
FOREWORD Thank you for purchasing the CH-250 Color LCD Searchlight Sonar. We are confident you will discover why FURUNO has become synonymous with quality and reliability. Dedicated in the design and manufacture of marine electronics equipment for half a century, FURUNO Electric Company has gained an unrivaled reputation as a world leader in the industry. This is the result of our technical excellence as well as our worldwide distribution and service network.
Usage Precautions • The Motion Sensor MS-100 compensates for ship’s pitching and rolling. However, it does not compensate for load unbalance. • If the equipment will not be used for a long time shut off the power to it at the mains switchboard to prevent battery discharge. • If the soundome is to be operated while the ship is dry-docked set the transmitter output power to “minimum” on the COM1 menu. Damage to the train-tilt section may result if it is operated with maximum transmitter power.
SYSTEM CONFIGURATION INTERFACE UNIT IF-8000 Note 2 MONITOR UNIT MU-100C Navigator Control Unit Display Unit Note 1 VGA Ext. Monitor Remote Controller CH-256 TRANSCEIVER UNIT CH-253 CONTROL UNIT CH-252 MOTION SENSOR 12-32 VDC HULL UNIT SPEAKER DATA/VIDEO OUT 12-32 VDC Speaker Motion Sensor MS-100 HULL UNIT CH-254 CH-255 12/24-32 VDC Note 1: MU-100C is the standard supply monitor unit. An external monitor may be connected via the interface unit (option).
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1. OPERATIONAL OVERVIEW 1.1 Control Description Selects center bearing of training sector. Selects detection range. Switches training sector to 360˚ (horizontal mode), or 180˚ (vertical fan mode). Turns the power on/off. Selects scan speed (sonar)/picture advancement speed (echo sounder). Raises the transducer. = Controls tilt angle. = Selects center direction of Adjusts receiver sensitivity. the vertical scanning sector. Selects width of training sector. Turns target lock on/off.
1.2 Remote Controller The Remote Controller CH-256 (option) provides armchair control over range, tilt, target lock and range of sounding. Select tilt angle. Select display range. Selects range of sounding for full circle 360˚ (horizontal mode) or half circle 180˚ (vertical fan mode). Enables/disables target lock. Figure 1-2 Remote controller Note: The remote controller can also be used with a commercial monitor.
1.3 Turning the Power On/Off 1.3.1 Power on This sonar has a demonstration mode which lets the operator become acquainted with the features of the sonar. For further details see page 5-18. Press the [POWER] switch on the control unit till hear “click.” A beep sounds, the lamp above the switch lights and the last-used display appears. Note: Wait at least five seconds before reapplying the power. 1.3.2 Power off 1. Press the [↑] switch on the control panel.
1.4 Raising, Lowering the Transducer 1.4.1 Lowering the transducer With the boat at the fishing ground, press the [↓] switch to lower the transducer. The lamp above the switch blinks while the transducer is being lowered and lights when it is completely lowered. The down arrow of the transducer status indicator at the top right corner of the display is filled when the transducer is completely lowered.
1.5 Adjusting Screen Brilliance, Panel Dimmer Screen brilliance can be adjusted in nine steps and panel dimmer (backlighting) in four. 1. Press the [BRILL] key to open the dialog box for screen brilliance and panel dimmer. Do the next step within four seconds, otherwise the dialog box will be erased. BRILL:3 DIMMER:3 Figure 1-3 Brilliance, panel dimmer dialog box 2. Operate or to adjust screen brilliance (0 is the lowest brilliance; 9 the highest).
1.6 Selecting a Display This sonar has eight display modes and you may select one with one of the DISPLAY MODE keys. Refer to the chapter shown in the illustration for more information about each mode. Key Picture Key Picture NAV DATA HORIZONTAL NAV DATA EXPANDED HORIZONTAL This mode provides 360 degree coverage. Useful for general search. (Chapter 2) Zoomed horizontal picture appears over the entire screen.
1.7 Adjusting the Gain The [GAIN] control adjusts the sensitivity of the receiver. Normally, the control is adjusted so that the bottom echo is displayed in reddish-brown mixed with red. Initially set the gain between “4” and “6” and then fine tune depending on fishing ground, etc. Too Low Proper Too High Figure 1-5 How to adjust the gain 1.8 Basic Menu Operation The menu, consisting of six menus, mostly contains items which once preset do not require frequent adjustment.
2. The last-used menu is displayed. (In Figure 1-6 the COM2 menu is selected.) To select a to select MENU at the top of the screen and then press or to different menu, press select menu desired. or 3. Press provided. to select menu item desired. At the bottom of the screen menu help is 4. Press ► to open the corresponding dialog box. The example below shows the dialog box for DELETING TRACK in the COM2 menu. DELETING TRACK NO YES Figure 1-7 Dialog box for deleting track 5.
2. HORIZONTAL MODE 2.1 Operational Overview The figure below shows the typical horizontal mode operating sequence. 7. Set center bearing of train sector. 6(a). Set scanning sector. 8. Set tilt angle. 5. Set range. 1. Turn on the power. 11. Adjust menu settings 9. Adjust gain. (ex. TVG) as required. XDR GAIN SECTOR POWER DISPLAY MODE 2. Lower the transducer. RANGE TRAIN TILT MAIN FULL FAST SUB HALF SCAN BRILL TARGET MENU R/B EVENT CUSTOM MODE 4.
2.2 Typical Horizontal Mode Display * Depth marker When depth data is input from external equipment, the depth marker shifts according to depth data. If the depth data is greater than the horizontal range, the depth marker shifts to lowest position. Tilt angle indicator (Indicates transducer tilt angle.) Horizontal max.
2.3 Selecting the Range The [RANGE] control selects the detection (display) range. Select the range according to either the fish species being searched or the depth desired. 15 ranges are available and minimum and maximum ranges depend on the transducer used. SEA SURFACE SEA SURFACE Range indicated onRange the screen. indicated on the screen. BOTTOM BOTTOM Figure 2-3 How to select the range Default horizontal mode range settings Range No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 No.9 No.10 No.11 No.12 No.
2.4 Selecting Sector Width Sector means the width of the transducer training. Display sector (shown: 96˚) 96° Figure 2-4 Display sector The [SECTOR] control selects the training (display) area among the sixteen positions shown in the table below. Clockwise rotation of the control increases the sector width; counterclockwise rotation decreases it.
2.5 Selecting Train Center The [TRAIN] control selects the center direction of the detection range. The range of adjustment is 0° to 354° in increments of 6°. The selected bearing is shown with a filled circle, the train indicator, on the bearing scale. 0˚ (360˚) → 6˚ → 12˚ → 18˚ → ... 354˚ Train indicator Sector Figure 2-6 Train center 2.6 Selecting the Tilt Angle The tilt angle shown the direction to which the sound wave is emitted.
2.6.1 Bottom echo and tilt angle Refer to the illustration below. Case1: Tilt angle 30°° to 40°° This tilt angle will display the entire bottom since it is captured by the full width of the beam. Case2: 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. Case3: Tilt angle 0°° to 5°° This tilt angle may or may not capture the bottom since the returning echo is weak. 2.6.
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. 2.6.
2.6.4 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.
2.7 Selecting the Training Speed The training speed selects how fast the transducer scans the sounding sector. Two choices are available, normal speed (default setting) and high speed, and one may be selected with the [FAST SCAN] key. Each time the key is pressed “NORM” (normal speed) or “FAST” (high speed) momentarily appears at the screen top. Normal (6°) : 60 transmissions required to complete full 360° picture (default setting).
2.9 Event Marker The event marker functions to mark important locations on the screen, and five event markers may be inscribed. Each time the [EVENT] key is pressed the “latest event marker” (⊕) is inscribed at the cursor location and all previously entered event markers are shown by the “previous event marker” (+). When the capacity for event markers is reached the eldest event marker is erased from the screen to make room for the latest.
2.9.2 Deleting all event markers All event markers can be erased from the screen as follows: 1. Operate the Omnipad to place the cursor outside the display area. 2. Press the [EVENT] key to show the following dialog box. Do the next step within four seconds, otherwise the dialog box will be erased. DELETE EVENT MARK? NO YES 3. Press to select YES and press the [MENU] key. All event markers are erased from the screen. 2.
2.11 Adjusting the Picture 2.11.1 Suppressing bottom and surface reflections In shallow fishing grounds, excessive sea surface and bottom reflections often interfere with wanted fish echoes and they cannot be eliminated sufficiently with the TVG controls. In such cases, try to reduce the output power, without turning down the gain. The picture becomes clearer when output power is reduces rather than when the gain is decreased. 1. Press the [MENU] key to open the menu. 2.
2.11.2 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 pulselength on the COM1 menu to decrease the tail of bottom reflections. 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press 3. Press or to select the COM1 menu. to select PULSELENGTH and press .
To adjust TVG: 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press COM1 MENU COM2 TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER TARGET KEY 4.0 4.0 0 LOG 0 REVERSE LOCK MODE AUTO TILT AUTO OFF : SELECT : CHANGE to select HORZ. HORZ VERT ES PRESET SYS MENU: END Figure 2-15 HORZ menu 3. Press or to select TVG DISTANCE and press TVG DISTANCE . The following dialog box appears. 4.0 Hi Lo 200 or to adjust TVG distance between 3.0 and 5.0 (130-320 m).
5. Press the [MENU] key to register your selection and close the menu. 6. To suppress reflections by the sea surface or plankton, select TVG LEVEL and press . or to adjust TVG LEVEL, considering sea conditions. A setting between 2.0 and 7. Press 5.0 should provide satisfactory results. The higher the figure the less the gain over distance. 8. Press the [MENU] key to register your selection and close the menu. 9. Watch a distant fish echo which is approaching own ship.
2.11.5 Enlarging fish echoes (expand horizontal display) Fish echoes may be enlarged 1.5 times by using the expanded horizontal display. Press the key to show the expanded horizontal display. The direction of expansion depends on the train direction as below.
2.12 Target Lock Three types of target lock modes are available. Manual reverse: The transducer train direction is reserves manually. This is the default setting, and is available in the horizontal and vertical fan modes. Position: Tracks stationary position (such as a reef) using position data from a navigator. Available in the horizontal mode only. Echo: Tracks fish echo either manually or automatically. Available in the horizontal mode only. 2.12.1 Setting target lock mode 1.
2.12.3 Position mode This mode tracks a stationary position (such as a reef) using position data fed from a navigator. Note1: This function is inoperative in the echo sounder mode. In the vertical fan mode the reverse mode is automatically selected regardless of the setting in paragraph 2.12.1. Note2: This mode requires position data. When there is no position data the message “NO POSITION DATA.” appears for five seconds and tracking is automatically cancelled. Check the navigator.
2.12.4 Echo mode The echo mode tracks a fish school either automatically or manually. The default setting is automatic, and you can select automatic or manual with “LOCK MODE” in the HORZ menu. Automatic echo tracking mode The automatic echo target lock function automatically tracks a fish school appearing in the operator-selected target lock zone. If the tracked fish school goes out of the zone in the range direction, tracking is suspended until it or a new fish school comes into the zone.
When the fish echo is lost the tilt angle is automatically changed as below to continue tracking the echo: Tilt changed to search [(A + 10˚) → (A - 10˚) →A] Detection area displayed once again and target lock indicator lights. A: Tilt angle at start of target lock 5. To turn off the target lock, press the [TARGET] key again. The message “LOCK END” appears for three seconds at the screen top, the target lock indicator disappears and operation continues with current train and tilt settings.
2.13 Horizontal Menu Overview This section presents an overview of the items on the HORZ menu. 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press COM1 MENU COM2 TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER TARGET KEY 4.0 4.0 0 LOG 0 REVERSE LOCK MODE AUTO TILT AUTO OFF : SELECT : CHANGE or to select the HORZ menu. HORZ VERT ES PRESET SYS MENU: END Figure 2-19 HORZ menu 3. Press or 4. Press to show corresponding dialog box. 5.
CLUTTER: Low intensity echoes, often caused by sediments in water, are painted on the screen as a large number or random dots. This noise can be suppressed. The higher the number (setting) the weaker the echoes which are erased. RES. COLOR: Sets transfer characteristics of input signal level versus display echo level. Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG, and you can observe the characteristics of each by watching the color bar as you change the setting.
2.14 Interpreting the Horizontal Display This section provides information necessary for interpreting the horizontal display. 2.14.1 How the horizontal mode 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 sectors of increments of 12° of the screen. Thus, all directions around the boat are sounded in 30 times of transmissions.
2.14.2 Sample echo displays Bottom echoes When the tilt angle is changed, the bottom echo illustrated below will appear on the display. When the tilt is decrease (toward 0°), the bottom trace becomes winder and weaker. By observing the bottom condition on the display, the skipper can prevent net damage. (A) Flat bottom Tilt angle: 10˚ to 15˚ Decreased tilt angle Only half of vertical beam width captures the bottom.
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: 0˚ to 10˚ Bottom echo not displayed because of decreased tilt angle. Sea surface reflections are present.
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 decreased tilt angle is used, sea surface reflections cover a large area as illustrated below.
Sidelobe echo (false echo) 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.
2.14.3 Combination display examples Horizontal/history display Press the key to display the horizontal/history display. Tilt angle Cursor position data Tilt angle indicator Range →17 ↓ 14 B148˚ + R 40 m T 40˚ 30 Interference rej. ON Target lock indicator 25 Own ship marker 34° 12. 343' N 134° 34. 213' W CSE 357˚ SPD 9.9 kt Train position Transducer status indicator Position in latitude*, longitude* Course*, speed* Fish echo Bottom echo Cursor * Requires appropriate sensor input.
Horizontal/video plotter display Press the key to display the horizontal/video plotter display. Tilt angle Cursor position data Tilt angle indicator Range →18 ↓ 15 B154˚ + R 40 m T 40˚ 30 Interference rej. ON Target lock indicator 25 Transducer status indicator Own ship marker 34° 12. 343' N 134° 34. 213' W Train position CSE 357˚ SPD 9.9 kt Track* Position in latitude*, longitude* Course*, speed* Sonar range marker (Radius changes with video plotter range.
Horizontal/strata display Press the key to display the horizontal/strata display. Tilt angle Cursor position data Tilt angle indicator Range →12 ↓ 10 B133˚ + R 40 m T 40˚ 30 Interference rej. ON Target lock indicator 25 Own ship marker Transducer status indicator 34° 12. 343' N 134° 34. 213' W CSE 357˚ SPD 9.9 kt Train position PORT Position in latitude*, longitude* Course*, speed* STBD Number of lines increases by one with each train. Top line is latest; bottom line is oldest.
Color bar for the strata display The depth of the bottom each in all directions is displayed in the sub window, in the colors set by the color bar for the strata display. The color bar for the strata display shows search angle range below 336 degrees. Strongest color Weakest color -90˚ -18˚ -12˚ -6˚ 0˚ 6˚ 12˚ 18˚ 90˚ The undulation of the bottom echo in all directions is shown by the colors on the color bar for the strata display.
Projection in fore direction and strata display Color "b" on the color bar is displayed here.
3. VERTICAL FAN MODE 3.1 Operational Overview The figure below shows the typical vertical fan mode operating sequence. 6. Set center bearing of train sector. 7(a). Set scanning sector. 1. Turn on the power. 8. Set tilt angle. 5. Set range. 11. Adjust menu settings 9. Adjust gain. (ex. TVG) as required. XDR GAIN SECTOR POWER DISPLAY MODE RANGE TRAIN TILT MAIN FULL FAST SUB HALF SCAN BRILL TARGET MENU R/B EVENT CUSTOM MODE 2. Lower the transducer. 4.
3.2 Typical Vertical Fan Mode Display Bearing indicator (Shows training direction.) FORE Own ship PORT STARBOARD AFT Vertical range Horizontal range Training indicator Interference rejector ON Transducer status indicator Filled arrow: Respective action completed Blinking arrow: Action in progress Heading* Cursor position data Horizontal range scale +→6 ↓ 145 60 R → 60 m ↓ 100 m 340˚ FORE AFT 60 34° 12. 343' N 134° 34.
3.3 Selecting the Range The [RANGE] control selects the detection (display) range, in 15 settings. Select the range according to either the fish species being searched or the depth desired. Each time the control is operated the newly selected range briefly appears in large characters at the screen top. Range is permanently displayed at the top right-hand corner of the screen. Normally the range is set so that the bottom is traced at the lower part of the screen (like an echo sounder).
3.4 Selecting Train Center The [TRAIN] control determines the bearing of the vertical fan beam, from 0° to 180°. Bearing of beam position can be found with the train indicator. 0˚ (360˚) → 6˚ → 12˚ → 18˚ → ...
3.5 Selecting Display Sector Sector means the width of the transducer training, from 6° to 180°. Sector (Shown: 24˚) 24˚ Figure 3-6 Sector The [SECTOR] control selects the training area among the sixteen positions shown in the table below. Clockwise rotation of the control increases the sector width; counterclockwise rotation decreases it.
3.6 Selecting Sector Center The center direction of the sounding beam in the vertical direction can be changed with the [TILT] control. The setting range is 0° to 180° in increments of 6°. Select the setting which places the sector center in the middle of the detection range. Sector center angle set with TILT control PORT In the example display at left, the sector center indicator is starboard, and the width of the sector is 48˚.
3.7 Selecting the Training Speed The training speed selects how fast the transducer scans the display sector. Two choices are available, 3° (normal speed, default setting) and 6° (high speed), and one may be selected with the [FAST SCAN] key. Each time the key is pressed the display momentarily shows “NORM” (normal speed) or “FAST” (high speed). Normal: 60 transmissions for half circle in increments of 3°. High: 3.8 30 transmissions for half circle in increments of 6°.
3.9 Event Marker The event marker functions to mark important locations on the screen, and five event markers may be inscribed. Each time the [EVENT] key is pressed the “latest event marker” (⊕) is inscribed at the cursor location and all previously entered event markers are shown by the “previous event marker” (+). When the capacity for event markers is reached the eldest event marker is erased from the screen to make room for the latest.
3.9.1 Deleting all event markers All event markers can be erased from the screen as follows: 4. Operate the Omnipad to place the cursor outside the display area. 5. Press the [EVENT] key to show the following dialog box. Do the next step within four seconds, otherwise the dialog box will be erased. DELETE EVENT MARK? NO YES 6. Press to select YES and press the [MENU] key. All event markers are erased from the screen. 3.
3.11 Adjusting the Picture 3.11.1 Displaying weak echoes clearly 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.
4. Press or to adjust TVG distance, considering sea conditions. The larger the figure the greater the distance at which the TVG works. TVG Distance Setting Meters Feet Passi/braza Hiro 5. Press or 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 .... 10.0 3 10 2 2 8 30 5 5 20 70 10 10 40 130 20 20 60 210 40 40 100 330 60 60 130 410 80 80 160 520 100 100 200 660 120 130 250 820 150 170 320 1040 180 210 .... 1000 3280 600 660 .... to close the dialog box and return to the VERT menu. 6.
3.12 Vertical Menu Overview This section presents an overview of the items on the VERT menu. 1. Press the [MENU] key to open the menu. 7. Press to select MENU and then press COM1 MENU TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER HORZ RANGE : SELECT COM2 or to select the VERT menu. HORZ VERT ES PRESET SYS 4.0 4.0 0 LOG 0 x1 : CHANGE MENU: END Figure 3-16 VERT menu 8. Press or to select item desired. 9. Press to show corresponding dialog box. 10.
CLUTTER: Low intensity echoes, often caused by sediments in water, are painted on the screen as a large number of random dots. The higher the number (setting) the weaker the echoes which are erased. HORZ RANGE: You may choose the horizontal range expansion factor for the vertical scan picture, from x1 or x2. Note that this feature cannot be adjusted when the vertical search mode, activated by a function key, is turned on. 3.
3.13.2 Sample echo displays Port-starboard picture (bottom) You can see fish echoes at the center-right of the screen. 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 STBD PORT Fish school Bottom Figure 3-18 Port-starboard picture When ship passes over fish schools The sounding beam is directed fore-aft and the display is off-centered* to present a wider view of the area forward of the ship.
Display of net hauling This is an example of net hauling display. The location of the net is indicated clearly. FORE AFT Net Figure 3-20 Net hauling and sonar picture False echo In shallow water (depth 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 COM1 menu may lessen this effect.
3.13.3 Horizontal/vertical fan display Press the key to display the horizontal/vertical fan display. Tilt angle Cursor data Vertical fan bearing cursor →17 ↓ 14 B156˚ + Tilt angle indicator Range R T 40 m 40˚ 30 Interference rejector ON Target lock indicator 25 Transducer status indicator Own ship marker 34° 12. 343' N 134° 34. 213' W CSE 357˚ SPD 9.9 KT Train position AFT FORE Position in latitude*, longitude* Course*, speed* * Requires navigator.
SECTOR control For the vertical fan display: When the display sector is 6° (minimum) the tilt angle of the horizontal and vertical fan modes are interlocked and each transmission on the horizontal display is reflected on the vertical fan display. The message TILT ANGLE MONITOR WINDOW momentarily appears on the screen and the vertical bearing cursor disappears. Note: Only the [SECTOR] control may be operated in this condition.
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4. ECHO SOUNDER MODE 4.1 Operational Overview The figure below shows the typical echo sounder mode operating sequence. 8. Set tilt angle. 7. Select display sector. 5. Set range. 11. Adjust menu settings (turn on A-scope display, etc.). 1. Turn on the power. 6. Adjust gain. XDR GAIN SECTOR RANGE TRAIN POWER DISPLAY MODE TILT MAIN FULL FAST SUB HALF SCAN BRILL TARGET MENU R/B EVENT CUSTOM MODE 2. Lower the transducer. 4. Select echo sounder 10.
4.2 Typical Echo Sounder Display Press the key to display the echo sounder picture. Tilt angle indicator Bearing (Shows tilt angle of transducer.) indicator (Shows train Tilt angle direction.) Interference rejector ON Range Heading Cursor position + 4 ↓ 340° Transducer status indication R 10 m T 60° Minute marker 34° 12. 343' N 134° 34. 213' W Fish echo Cursor Range CSE SPD 357˚ 9.9 kt CUR 11.0˚ 2.0 kt GAIN 5.3 5 5 Bottom echo TVG LEVEL 4.
4.3 Selecting the Range The [RANGE] control selects the detection (display) range, in 15 settings. Select the range according to either the fish species being searched or the depth desired. Each time the control is operated the newly selected range briefly appears in large characters at the screen top. Range is permanently displayed at the top right-hand corner. Normally the range is set so that the bottom is traced at the lower part of the screen.
4.4 Train Direction The sounding beam may be directed toward fore, aft, port or starboard. Operate the [TRAIN] control to select sounding beam direction. Each setting on the control is an increment of 6°. The train indicator at the top of the screen shows training direction: 0°, fore direction; 90°, starboard direction; 180°, aft direction, and 270°, port direction. 0˚ (360˚) → 6˚ → 12˚ → 18˚ → ... 354˚ Train 0˚ Train 90˚ Train 180˚ Train 270˚ Figure 4-4 Train indicator and display 4.
4.7 Measuring Range by Cursor Use the cursor to display the range from own ship to the cursor location. Use the Omnipad to place the cursor where desired. The range to the cursor appears at the upper left-hand corner of the screen. ↓ Range to cursor : Range NAV DATA or A-SCOPE DISPLAY Depth, Water Temp. Display Cursor Figure 4-4 How to measure range with the cursor 4.8 Event Marker The event marker functions to mark important locations on the screen, and five event markers may be inscribed.
4.8.1 Inscribing the event marker 1. Operate the Omnipad to place the cursor on the location desired for an event marker. 2. Press the [EVENT] key to inscribe the event marker. Display area "Previous event marker" NAV DATA or A-SCOPE DISPLAY Depth, Water Temp. Display "Latest event marker" To delete all event markers, place the cursor outside the display area and press the [EVENT] key. Figure 4-5 How to inscribe, delete the event markers 4.8.
4.9 Range Marker The range marker functions to measure the range to a target echo (fish school, bottom, etc.) 1. Operate the Omnipad to place the cursor on the location desired. 2. Press the [R/B] key to display the range marker. The range marker appears along with range indication. 3. To erase the range marker, press the [R/B] key again, or place the cursor on the range marker and press the [R/B] key. Range marker Range NAV DATA or A-SCOPE DISPLAY 67 Depth, Water Temp.
COM1 MENU COM2 TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER 4.0 4.0 0 LOG 0 A-SCOPE OFF HORZ VERT : CHANGE : SELECT ES PRESET SYS MENU: END Figure 4-7 ES menu 3. Press or to select TVG DISTANCE and press . The following dialog box appears. TVG DISTANCE 4.0 GAIN Hi Lo 4. Press or TVG Distance Setting Meters Feet Passi/braza Hiro 5. Press or 200m to adjust TVG distance. 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 .... 10.
4.10.2 Finding echo strength (A-scope display) The A-scope display shows echoes at each transmission with amplitudes and tone proportional to their intensities on the right 1/4 of the screen. It is useful for estimating the kind of fish school and bottom composition. 1. Press the [MENU] key. 2. Press to select MENU. 3. Press or 4. Press to select A-SCOPE. 5. Press or to select ES. to open the dialog box. A-SCOPE OFF 6. Press ON to select ON. 7. Press the [MENU] key to close the dialog box.
4.11 Echo Sounder Menu Overview This section presents an overview of the items on the ES menu. 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press COM1 MENU COM2 TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER 4.0 4.0 0 LOG 0 A-SCOPE OFF : SELECT : CHANGE or to select the ES menu. HORZ VERT ES PRESET SYS MENU: END Figure 4-9 ES menu 3. Press or to select item desired. 4. Press to show corresponding dialog box. 5. Press or to select option desired.
RES. COLOR: Sets transfer characteristics of input signal level versus display echo level. Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG. You can see the characteristics of each by watching the color bar as you change the setting. The default setting is LOG. LOG: Displays weak to strong echoes in their respective levels. This setting is suitable for general use. LINEAR: Downplays the weak echoes when compared with LOG. Effective for suppressing weak echoes such as plankton.
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5. MENU OPERATION This chapter provides menu operating information on menus not previously discussed: COM1, COM2, PRESET (or SHORT-CUT, depending on the setting of CUSTOM KEY on the SYSTEM SETTING 1 menu) and SYS (System) menu. 5.1 COM1 Menu 1. Press the [MENU] key to open the menu. 2. Press to select MENU, and then press COM1 MENU COM2 TX POWER PULSELENGTH TX RATE INT REJECT AGC MAX LONG 10 OFF OFF AUDIO LEVEL 0 : SELECT : CHANGE to select COM1.
5.1.1 COM1 menu description TX POWER: Selects transmitter output power to maximum or minimum. The default setting is "maximum." For further details see page 2-12. PULSELENGTH: Selects pulselength to short or long (default setting). For details see paragraph 2.11.2 on page 2-13. TX RATE: The Tx rate may be set between 1-10 (default setting: 10) in the case of the internal transmitter, or an external synchronous signal may be used. The higher the number the greater the number of transmissions.
5.2 COM2 Menu 5.2.1 Displaying the COM2 menu 1. Press the [MENU] key to open the menu. 2. Press ▲ to choose MENU, and then press ◄ or ► to choose COM2. COM1 MENU DELETING TRACK WHITE MARKER SIG LEVEL COLOR BKGD COLOR : SELECT COM2 HORZ VERT ES PRESET SYS NO OFF OFF 16 2 : CHANGE MENU: END COM2 menu 5.2.2 COM2 menu description DELETING TRACK: Choose ON to delete all ship’s track (from horizontal and horizontal/video plotter displays). WHITE MARKER: Displays desired echo in white.
5.3 Short-cut Menu, Preset Menu These menus program the CUSTOM MODE keys [1], [2] and [3], and one of the menus appears according to the setting of CUSTOM KEY on the SYSTEM SETTING 1 menu. Short-cut key: One-touch activation of corresponding dialog box. This is the default setting. Preset key: One-touch setup of mode, sector, train, range, tilt and speed controls. Below are the default settings for PRESET.
** SYSTEM MENU ** SYSTEM SETTING: RANGE-SONAR MODE RANGE-VERTICAL MODE RANGE-E/S MODE RANGE-TRACK MODE COLOR PALETTE LANGUAGE SYSTEM BACKUP LOAD BACKUP DATA HEADING OFFSET, DRAFT OFFSET ADJ MOTION SENSOR TX FREQ ADJUST TEST TEST PATTERN DEMO MODE DEFAULT : SELECT : MENU DISPLAY MENU: END Figure 5-3 System menu 5. Press to open the SYSTEM SETTING menu.
7. Press or to select PRESET KEY or SHORT-CUT KEY as desired. 8. Press the [MENU] key twice to register your selection and close the menu. 5.3.2 Preset key 1. Select PRESET KEY following the procedure in paragraph 5.2.1 on page 5-3. 2. Press the [MENU] key to open the menu. 3. Press to select MENU, and then press COM1 MENU MODE COM2 SECTOR or to select PRESET.
5.3.3 Short-cut key The default settings are key [1], interference rejector; key [2], signal level, and key [3], background color. The operator may change their functions as desired. Note: In the combination modes the short-cut key operation is only possible from the main window. 1. Select SHORT-CUT following the procedure in paragraph 5.2.1 on page 5-3. 2. Press the [MENU] key to open the menu. 3. Press to select MENU, and then press COM1 MENU KEY 1 KEY 2 KEY 3 COM2 or to select SHORT-CUT.
VERTICAL SEARCH FUNCTION When you find a target of interest on the horizontal display, simply press the function key programmed for VER. SEARCH to get a cross-sectional view of the vertical plane. This mode is useful for evaluating fish school concentration and location of the targeted fish school or for navigation purposes.
5.4 SYS Menu This menu provides items which may be set according to operator’s preference. A demonstration mode is provided to acquaint you with the many functions of this equipment, and it may be used without connection of the transducer. 1. Press the [MENU] key to open the menu. 2. Press to select MENU, and then press 3. Press to select GO TO SYS MENU. 4. Press to select YES. to select SYS.
SYSTEM SETTING 1 menu 1. Display the SYSTEM menu and press 2. Press or to select SYSTEM SETTING. . 3. Press to MENU. 4. Press to select “1.
HEADING INDICATION: Selects heading indication format, true (default setting) or azimuth, for the echo sounder and vertical fan modes. The default setting is TRUE. Requires heading data. NORTH MARK: Turns the north marker on or off (default setting). Requires heading data. CSE DATA: Selects heading data source, navigator or gyrocompass, to draw ship’s track. The default setting is navigator. For heading sensor or gyrocompass connection, choose gyrocompass.
SYSTEM SETTING 2 menu description ** SYSTEM SETTING 2 ** 1 MENU 2 : OFF : OFF ON SPEED ALARM/MESSAGE : OFF ON SWEEP INDICATOR : DOT SOUNDOME SERIAL NO : -999 DEFAULT SETTING : NO LINE 1000YES STABILIZER AUTO RETRACTION (OFF, 5-15kt) MAXIMUM ALLOWABLE SPEED IS 15 KNOTS WHILE SOUNDDOME IS BEING RETRACTED. IF VESSEL HAS RAPID ACCELERATION CAPABILITIES, AUTO RETRACTION SETTINGS OF 10-12 KNOTS ARE MANDATORY TO AVOID CATASTROPHIC DAMAGE TO SOUNDOME ASSY. ANY PHYSICAL DAMAGE TO THE SOUNDOME ASSY.
SPEED ALARM MESSAGE: Turn on (default setting) to display speed alarm message and sound the audio alarm when ship’s speed exceeds allowable speed for a given transducer operation. The audio alarm can be silenced with the [R/B] key. [↓] pressed to lower transducer Speed above 15 kts Message 1 appears. Reduce speed below 15 kts to restore normal operation. Transducer being lowered Speed over 15 kts Message 1 appears and lowering continues.
DEFAULT SETTING: Select YES and press the [MENU] key to restore all default system menu settings. Several beeps sound while default settings are being restored and then normal operation is restored. ** FACTORY SETTING ** ARE YOU SURE? : NO YES NOTE: ALL THE SYSTEM SETTING WILL BE CHANGED TO FACTORY SETTING.
5.4.2 Sonar (horizontal) mode range settings The user may preset horizontal mode ranges as desired. 1. Select RANGE-SONAR MODE at the SYS menu and then press . ** RANGE-SONAR MODE ** 1 2 3 4 : : : : 5 6 7 8 9 : : : : : 80 120 160 200 250 10 11 12 13 14 15 : : : : : : 300 400 500 600 800 1000 TRACK DISP : 10 (10-1600m) 20 40 60 500 (500-5000m) DEFAULT SETTING : : SELECT NO : CHANGE YES MENU: END Figure 5-13 Range-sonar mode menu 2. Press or to select range number desired. 3.
5.4.3 Vertical fan mode range settings As with the horizontal mode, the user may preset the vertical fan mode’s ranges. 1. Select RANGE-VER MODE at the SYS menu and then press . ** RANGE-VER MODE ** 1 2 3 4 : : : : 10 (10-600m) 20 30 40 5 6 7 8 9 : : : : : 60 80 100 120 160 10 11 12 13 14 15 : : : : : : 200 250 300 400 500 600 DEFAULT SETTING : : SELECT NO : CHANGE YES MENU: END Figure 5-14 Range-ver mode menu 2. Press or to select range number desired. 3. Press or to set range. 4.
5.4.4 Echo sounder mode range settings As with the horizontal and vertical fan modes, the user may preset the echo sounder mode’s ranges. 1. Select RANGE-E/S MODE at the SYS menu and then press . ** RANGE-E/S MODE ** 1 2 3 4 : : : : 10 (10-600m) 20 30 40 5 6 7 8 9 : : : : : 60 80 100 120 160 10 11 12 13 14 15 : : : : : : 200 250 300 400 500 600 DEFAULT SETTING : : SELECT NO : CHANGE YES MENU: END Figure 5-15 Range-E/S mode menu 2. Press or to select range number desired. 3.
5.4.5 Track range settings You may choose the video plotter display scale range as follows. 1. Choose RANGE-TRACK at the SYS menu and then press ►. ** RANGE-TRACK MODE ** 1 2 3 : : : 500 (100-10000m) 1000 2000 4 : 4000 5 : 8000 DEFAULT SETTING : : SELECT NO YES : CHANGE MENU: END Figure 5-16 Range-track mode menu 2. Press ▲ or ▼ to choose range number desired. 3. Press ◄ or ► to set. 4. Press the [MENU] key to register settings and close the menu.
5.4.6 Color palette The color palette lets the user change the color of echoes, background, text and menu as desired. Cursor ** COLOR PALETTE ** 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ECHO Arrow BKGD TEXT MENU BKGD TEXT MENU BKGD1 BKGD TEXT MENU BKGD3 BKGD2 COLOR : ECHO 1 R G B : : : DEFAULT SETTING : 3 6 13 NO : SELECT YES (ECHO & BKGD COLORS WILL BE CHANGED.) : CHANGE MENU: END Figure 5-17 Color palette 1. Press or to place the cursor and arrow on the item to change.
5.4.7 Language Menu language can selected from among the languages shown in the Language menu and the default language is English. ** LANGUAGE ** LANGUAGE: JAPANESE ITALIANO SVENSK : CHANGE MENU: END ENGLISH PORTUGUES THAI FRANCAIS DANSK Figure 5-18 Language menu 5.4.8 System backup User settings can be backed up with the menu item SYSTEM BACKUP. ** SYSTEM BACKUP ** ARE YOU SURE? : NO YES NOTE: OVERWRITE PREVIOUS BACKUP DATA. : CHANGE MENU: END Figure 5-19 System backup menu 5.4.
5.4.10 Transducer frequency adjustment If the CH-250 is receiving interference from a video sounder or other sonar on board your ship, adjust the frequency of the CH-250’s transducer to reduce the interference. ** TX FREQ ADJUST ** FREQ SHIFT : : CHANGE 60.0 kHz (57-63 kHz) MENU: END Figure 5-21 TX frequency adjustment menu 5.4.11 Demonstration mode The demonstration mode provides a simulated sonar picture which helps you become acquainted with how your sonar works.
5.4.12 Restoring all default settings The item DEFAULT lets you restore all default menu settings. Select YES and press the [MENU] key to restore all default settings. Note that settings stored in SYSTEM BACKUP are not disturbed. ** DEFAULT ** ARE YOU SURE? : NO YES NOTE: RESET ALL THE SETTINGS INCLUDED IN SYSTEM MENU TO DEFAULT. : CHANGE MENU: END Figure 5-23 Default menu CAUTION All default settings will be restored. If necessary jot down settings which must be restored.
6. MAINTENANCE, TROUBLESHOOTING This chapter provides information necessary for keeping the equipment in good working order. WARNING ELECTRICAL SHOCK HAZARD Do not open the equipment. Only qualified personnel should work inside the equipment. 6.1 Preventive Maintenance Check the following points monthly. • Check all cables. If damaged, replace. • Check connectors at rear of each unit. Clean if necessary. • Check earth of each unit. Clean if necessary.
6.3 Hull Unit Maintenance 6.3.1 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 be accessed by removing the raise/lower drive assembly cover. 6.3.2 Manually raising, lowering transducer WARNING Turn off the power at the ship's mains switchboard before conducting the procedure below. Rotating motor can cause bodily injury. 1. Turn off the breaker on the hull unit. 2.
6.4 Transducer Maintenance When the ship is dry-docked remove marine growth from the transducer with fine sandpaper or a piece of wood. CAUTION Do not paint the transducer face. Loss of sensitivity will result. Do not use plastic solvents to clean the transducer. They can damage the transducer. 6.5 Fuse Replacement The fuse in the hull and transceiver units protect them from overvoltage, equipment fault and reverse polarity of the ship’s mains.
6.6 Troubleshooting The table below provides common symptoms of equipment troubles and the means to rectify them. Symptom Cannot turn on the power. Bottom echo becomes irregular. Weak echo Check, Remedy • • • • • Check cable between transceiver unit and display unit. Check ship’s mains. Have a suitably qualified technician check the fuse in the transceiver unit. Rough seas. Distance to the bottom changes due to rolling and pitching. Long range selected.
6.7 Error Messages The table below shows the error messages which may appear on the display. All error messages are accompanied by an audio alarm, which you may silence with the [R/B] key. Message Meaning, Remedy Hull Unit HULL UNIT POWER OFF (CHECK BREAKER AND FUSE.) PRESS R/B KEY TO SILENCE ALARM. Hull unit is not powered. Silence the audio alarm with the [R/B] key, and then turn on the hull unit to erase the message and restore normal operation. RAISE/LOWER FUNCTION HAS NOT BEEN COMPLETED.
6.8 Diagnostics 1. Press the [MENU] key to open the menu. 2. Press to select MENU, and then press 3. Press to select GO TO SYS MENU. 4. Press to select YES. to select SYS. 5. Select TEST and press to start the test. The lamps above the XDR switches light alternately for one second while the test is being conducted. In a few moments the results of the test appear. MAIN PROGRAM NO. 0650110-0** PANEL PROGRAM NO.
• TRAIN shows a figure between 355-359 if normal. NG appears in case of train error. • TEST COUNT shows the number of times the test has been consecutively executed. • At the bottom of the screen there are two major groups of zeroes (0), and they represent the keys and controls on the control panel and remote controller. Press a key and its on-screen location shows “1” while the key is pressed and “0” when it is released. Operate a control and its on-screen location changes as below.
6.9 Test Pattern A test pattern can be displayed to check for proper display of colors. 1. Press the [MENU] key to open the menu. 2. Press to select MENU, and then press 3. Press to select GO TO SYS MENU. 4. Press to select YES. to select SYS. 5. Select TEST PATTERN and press to display the test pattern. Press again to change the test pattern. The pattern changes in the sequence shown below with each press of .
MENU TREE [MENU] key COM1 menu TX POWER (MAX, MIN) PULSELENGTH (LONG, SHORT) TX RATE (EXTERNAL, 1-10; 10) INT REJECT (OFF, ON) DEFAULT SETTINGS AGC (OFF, ON) SHOWN IN BOLD ITALIC. AUDIO LEVEL (0-10) COM2 menu DELETING TRACK (NO, YES) WHITE MARKER (8-color: OFF, 1-7; 16-color: OFF, 1-15) SIG LEVEL (8-color: OFF, 1-6; 16-color: OFF, 1-14) COLOR (16, 8) BKGD COLOR (1, 2, 3) HORZ menu TVG LEVEL (0-10, 4.0) TVG DISTANCE (0-10, 4.0) GAIN ADJUST (-10 - +10, 0) RES.
(CONTINUED FROM PREVIOUS PAGE) SYSTEM menu SYSTEM SETTING SYSTEM SETTING 1 POSITION (SHIP'S L/L, SHIP'S LOP, CURSOR L/L) TRACK (OFF, ON) CURRENT DATA (OFF, FLOW FROM, FLOW TO) HEADING INDICATION (TRUE, AZ) NORTH MARK (OFF, ON) CSE DATA (NAV, GYRO) NAV DATA (GPS, LoranC, LoranA, DR, DECCA, OTHERS) TVG CORRECTION (OFF, 1/2, 1/1) UNIT (m, ft, fa, HIRO, P/B) TEMP (°C, °F) TARGET L/L (OFF, ON) CUSTOM KEY (PRESET KEY, SHORT-CUT KEY) EMPHASIS MODE (OFF, NORMAL, RED) ETA MARK (OFF, 10sec, 30sec, 1min, 3min, 6min)
SPECIFICATIONS OF 10.4 INCH COLOR LCD SEARCHLIGHT SONAR CH-250 1 GENERAL 1.1 Display System 10.4 inch Color LCD 1.2 Transmit Frequency 60, 88 or 150 kHz selected 1.3 Output Power 0.8 kW (60 kHz) to 1.2 kW (150 kHz) 1.
2.7 Marker Range and Bearing to Waypoint 2.8 Indication Unit Meter, feet, fathom, P/B 2.9 Audio Monitor 2 W output (4 ohms), Freq. 1.0 kHz (external speaker required) 2.10 Event Mark 5 points 2.11 Hue Low level enhanced echo disappeared 2.12 Red Color Enhancement Strong echo indicated as expanded to range direction 2.13 Arrival Mark Vector estimated point after 10 seconds to 6 min. (menu setting) 2.
4.6 4.7 Vertical Fan Mode Control Scanning Angle 6° to 180°, 12° step Scanning Center 0° to 180°, 6° step Scanning Step Angle Normal: 3°, High speed: 6° Time to Train 360°, 6° step Transceiver Beam Width Frequency (-3 dB) Vertical Horizontal 60 kHz: 12° 15° 88 kHz: 9.5° 11.5° 150 kHz: 6.5° 6.5° 4.8 Allowable Ship’s Speed 20 knot or less (15 knot during raise/lower operation) 4.9 Stabilizer Within 30°, optional motion sensor or clinometers required 5 I/O INTERFACE 5.
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INDEX A AGC .......................................................5-2 A-scope display ......................................4-9 Automatic tilt.........................................2-18 B Background color....................................5-2 Backup data loading ..............................................5-20 saving ...............................................5-20 BRILL control..........................................1-5 C Clutter echosounder mode ........................... 4-11 horizontal mode.
replacement of fuse.............................6-3 transducer...........................................6-3 MENU key ..............................................1-7 Menu tree .............................................. M-1 N Navigation data..................................... 5-11 North marker......................................... 5-11 P Position display format..........................5-10 POWER switch .......................................1-3 PRESET menu .......................................
