SAFETY INSTRUCTIONS WARNING Do not open the equipment. Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment. Only qualified personnel should work inside the equipment. Do not disassemble or modify the equipment. Fire, electrical shock or serious injury can result.
TABLE OF CONTENTS FOREWORD A Word to CSH-7 Owners ... v Features ... v System Configuration ... vi OPERATIONAL OVERVIEW Equipment Overview ...1-1 Display Unit Control Panel Description ...1-2 Turning the Power On/Off ... 1-2 Adjusting Screen Brilliance, Control Panel Backlighting ... 1-3 Lowering the Transducer ...1-3...
INTERPRETING THE DISPLAY Seabed Echoes ...6-1 Fish Schools ...6-2 Sea Surface Reflections ... 6-3 Wake ...6-3 False Echo by Sidelobe...6-4 Noise and Interference ...6-4 MAINTENANCE Display Unit Maintenance ... 7-1 Hull Unit Maintenance ...7-2 TROUBLESHOOTING When the Transducer Cannot be Retracted ...8-1 Diagnostic Tests ...
A Word to CSH-7 Owners Congratulations on your choice of the FURUNO CSH-7 Color Scanning Sonar. We are confident you will see why the FURUNO name has become synonymous with quality and reliability. For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for qual- ity marine electronics equipment.
POWER switch OPERATIONAL OVERVIEW All operations of the CSH-7 are carried out through the display unit and the remote controller (option). The uncluttered, straight- forward control panel of the display unit provides intuitive op- eration. If you change a control setting you will see the associated reaction on the display almost immediately.
Display Unit Control Panel Description Raises, lowers the transducer, respectively. Lamp above a key blinks while the transducer is moving and lights when it stops. Turns transmitter on/off; freezes the display. The lamp above the switch lights when the transmitter is turned on and flickers when off. –...
Adjusting Screen Brilliance, Control Panel Backlighting Lowering the Transducer Selecting a Display Range Setting the Tilt Angle The BRILL control adjusts screen brilliance, and the DIMMER control adjusts control panel backlighting. Press the switch. The lamp above the switch blinks, and lights when the transducer is fully lowered.
Case 1 Fish school a Seabed Seabed echo and tilt angle Case 1: Tilt angle 30 to 40 degrees This tilt angle will display the entire seabed since it is captured by the full width of the beam. Case 2: Tilt angle 10 to 20 degrees This tilt angle will only display half the seabed since it is only captured by the lower half of the beam.
Points to consider • Normally, a vertically distributed fish school is a better sonar target than the seabed, because it reflects the transmitted pulse back toward the transducer. • In case 3, both fish schools a and b are presented. Gener- ally speaking, however, midwater fish schools tend to be larger than bottom fish schools and they are often displayed near the seabed on the display.
Tilt angle and beam coverage (200) 20(40) 40(80) 60(120) 80(160) 100(200) 200(400) Vertical width of sonar beam 100 m 100 m 16° 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.
Adjusting the Gain The GAIN control adjusts receiver sensitivity (gain). Adjust it so fish echoes are clearly displayed with minimal noise on the screen. Too high a setting not only displays excess noise and makes it difficult to discriminate wanted echoes but also causes seabed echoes to be painted in strong colors, resulting in echoes being masked by seabed reflections.
Standard Markers and Data Trackball marker data Slant range Horizontal range Depth True bearing Trackball marker Heading marker Own ship marker MARKERS AND DATA Heading data (Requires INTERFACE Board and gyrocompass.) ° ° B Bearing of bearing marker Range to range marker Figure 2-1 Standard markers and data Range...
Marker/Data Own Ship Marker Marks position on the screen. Direction of arrow is heading. The trackball marker selects location for markers and own ship’s Trackball position. The trackball moves the marker over the entire screen. Marker Trackball Data Trackball data: B : Bearing Bearing is shown in 360¡...
Optional Markers and Data Trackball marker data 23°S Latest event marker Tidal current marker Latest event ( 199) marker B E/N data Various markers and data are available with connection of the INTERFACE Board and appropriate external equipment. Optional markers and data in the normal mode Figure 2-2 Optional markers and data in the normal mode Heading indication R 300...
52°S Latest event marker Latest ( 165) event B 283° marker data NW/W data 17.0 Optional markers and data in the normal plus text mode NW/N R 313 B 7°P 13.02N 135: 16.39E 1.1 315° 25° 64° Figure 2-3 Optional markers and data in the normal plus text mode Heading indication R 800T...
Table 2-2 Optional markers and data description Marker Latest Event Marker The position data of the latest event marker, that is, horizontal range ( ), current depth ( ) and bearing. ( Data marker’s original depth, and remains unchanged regardless of ship’s movement or tilt angle.
Scan Menu Operation # Locked setting (in red). To change, select item, adjust GAIN control to MENU OVERVIEW The menu system consists of four menus: Scan menu, Menu-1, Menu-2, and System. The Scan menu can be opened while trans- mitting, and contains items which the user will often change during the course of operation.
3. Operate the RANGE control to scroll the menu and select item. The selected item is highlighted in green and current setting in white. 4. Operate the GAIN control to change setting. 5. Press the MENU key to register selections and close the menu. Note: Gain or range cannot be changed while the Scan menu is displayed.
MENU MODE DISPLAY MODE TX OUTPUT PULSELENGTH TX CYCLE TVG NEAR TVG FAR NOISE LIM HOR BEAM ANGL RES COLOR CURVE COL EMPHASIS FUNC1 PROG FUNC2 PROG USER PROG DEGAUSS AUTO DEGAUSS Requires INTERFACE Board. # Locked setting Displaying menu-1, menu-2, system menu 1.
This menu contains the same items as the Scan menu. See page 3-2 for description. Menu-2 description ** MENU - 2 ** MENU MODE EXT KP SYNC RANGE MARKER BEARING SCALE CURRENT MARK COURSE MARK HEADING INDI CURRENT INDI EVENT INDI MARK INDI POSITION DATA Requires INTERFACE Board.
System menu description ** SYSTEM MENU ** MENU MODE HEADING ADJ UNIT SHIP’S SPD/BR LOG PULSE CI BAUD RATE NAV FORMAT NAV BAUD RATE NAV DATA MENU SELECT SUB TEXT INDI LANGUAGE SELF TEST DEFAULTS Requires INTERFACE Board. # Locked setting t a t / i s .
The CSH-7 has two TVG functions, NEAR and FAR, and they mainly compensate for propagation loss on short and long ranges respectively, centered at the ranges shown below. The higher the TVG setting the greater the amplification of echoes.
Displaying Surface Fish Clearly Suppressing Seabed Tail 4. Locate a fish school on a long range setting which is ap- proaching own ship. Adjust the tilt to keep the fish school in the center of the sonar beam, namely, fish school is displayed in strongest colors possible.
Suppressing Seabed and Sea Surface Reflections in Shallow Waters WRONG METHOD CORRECT METHOD fish echoes from seabed reflections. Decrease the PULSELENGTH setting on the Scan menu to shorten the pulselength. For search of surface and midwater fish in which seabed reflections are not so strong, use the longest pulselength “10”.
Rejecting Sonar Interference and Noise While observing the sonar picture, you may encounter occasional or intermittent noise and interference. These are mostly caused by on-board electronic equipment, engine or propeller noise, or electrical noise from other sonars being operated nearby. Identifying noise source To eliminate noise effectively, you should first identify the noise source as follows:...
Rejecting interference with TX cycle When other sonars operate nearby at the same transmission in- terval as that of own ship’s sonar, an interference ring caused by other sonars is displayed. To erase the interference ring from the screen, reduce the TX CYCLE setting on the Scan menu. Interference TX CYCLE High TX CYCLE Lowered...
Measuring the Range and Bearing to a Target Detecting Fish Schools Aurally ADVANCED OPERATION Operate the trackball to place the trackball marker (+) on the target you want to measure the range and bearing. The range and bearing are displayed at the top left corner on the screen. Trackball marker Slant range Horizontal range...
Relocating Fish School for Easy Observation Trackball marker Bearing marker Figure 5-2 Area monitored in audio function (sample) When a fish school is located near the edge of the screen and inconvenient for observation, use the off-center function to re- locate the fish school to the desired place on the screen.
Function Keys (F1, F2) Function keys F1 and F2 work like the auto dialing feature on a telephone, instantly calling out desired settings to perform spe- cially assigned functions. These keys provide optimum sonar settings for a specific purpose with a single key operation. Each function key can be assigned a combination of particular sonar settings which will be most suited to a specific objective, for example, detection of a fish school.
Programming user programs 1. Press the TX switch to blink the lamp above it, if it is not already blinking. 2. Press the MENU key and select Menu-1. 3. Using the RANGE and GAIN controls, set menu options as desired. 4.
Ten event markers and ten own ship event markers may be entered. The CSH-7 denotes the latest event marker as other event markers as +. The own ship event marker is a tri- angle .When more than ten of either marker is entered the el-...
INTERPRETING THE DISPLAY Seabed Echoes (A) Flat seabed Tilt angle: 10 to 15 (B) Flat seabed Tilt angle: 20 or more (C) Sloping seabed Tilt angle: 20 or more When the tilt angle is widened, the seabed echo illustrated be- low will appear on the display.
Fish Schools (A) Sea surface fish Tilt angle: -5 to 10 (B) Midwater, bottom fish Tilt angle: 30 or more Fish echo which appears before seabed can be detected. Tilt angle: -0 to 20 Fish echo which appears together with or after seabed can be detected.
Sea Surface Reflections Tx 16 Rx 19 Wake Other ship ship Own ship's screw noise 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.
False Echo by Sidelobe Sidelobe Sidelobe Noise and Interference An ultrasonic wave is emitted only in the direction set by the TILT lever, however there are some emissions outside the main beam. These are called sidelobes. The ennergy 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.
Display Unit Maintenance Clean the screen and filter regularly. Cover the equipment when it is not in use. An anti-static spray may be used to clean the screen. Do not use chemical-based cleaners; they can remove paint and markings. Keep magnets and cassette tapes away from the display unit.
Hull Unit Maintenance CAUTION The zinc block near the transducer must be replaced yearly. The junction between the transducer and main shaft may corrode, which can result in loss of the transducer or water leakage inside the ship. HULL UNIT Figure 7-2 Hull unit maintenance Apply MOLYTONE grease #2 every six months.
When the Transducer Cannot be Retracted TROUBLESHOOTING WARNING Do not work inside the equipment unless totally familiar with electrical circuits. Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment. When the transducer cannot be completely retracted within 35 seconds after pressing , XDCR NOT RETRACTED! blinks at the screen center and the alarm sounds.
Hand crank POWER ON/OFF LED (Green) DOWN command LED (Red) Cable gland (Bottom view) How to use the hand crank 1. Turn off the POWER switch on the hull unit. 2. Remove gear cover. 3. Attach hand crank to shaft gear or motor gear. a) When crank is attached to shaft gear (Requires greater force but less turns.) Hand crank...
Diagnostic Tests CAUTION Raise the transducer before conducting the diagnostic tests. In the diagnostic tests the MENU key raises the transducer. Thus, personal injury can result if the key is operated while someone is near the transducer. This unit has eight diagnostic test which check it for proper op- eration.
Note: When the transducer is fully lowered, pressing the MENU key at the diagnostic test raises the transducer. Panel test This test checks the control panel for proper operation. PANEL TEST 0 0 0 0 0 0 0 0 0 PRESS [MENU] 2 or 3 SECONDS TO STOP SELFCHECK Figure 8-3 Results of panel test Color test...
Figure 8-4 Color test display Gray test This test checks for proper display of monochrome characters and markers. Concentric rings and a monochrome test bar are displayed. GRAY TEST PRESS [MENU] 2 or 3 SECONDS TO STOP SELFCHECK Figure 8-5 Gray test display Conti test This test continuously checks the display and transceiver units.
Figure 8-6 Results of continuous test SIO test This text checks transceiver unit input and output. SIO TEST MAIN SIO1 = OK SIO-NAV = NG SIO-CI = NG PRESS [MENU] 2 or 3 SECONDS TO STOP SELFCHECK Figure 8-7 Results of SIO test Echo-1 test This test checks the echo processing circuits in the display unit for proper operation.
Figure 8-8 Echo-1 test display Echo-2 test This test checks echo processing circuits in the display unit and transceiver unit. TRX ECHO TEST PRESS [MENU] 2 or 3 SECONDS TO STOP SELFCHECK Figure 8-9 Echo-2 test display Note: Appearance of above test pattern may vary slightly depending on the frequency or internal settings.
Markers, indications Data Units of measurement Standard features SPECIFICATIONS CSH-7-xx (55: 55 kHz, 70: 70 kHz) PPI display on 10" non-glare high resolution CRT 16 colors according to echo strength Normal, *Normal plus text 384 dot Own ship marker, Heading marker, Trackball marker, *Own...
Range, TX cycle, pulselength Range, range display Pulselength TX cycle Audio Search Searching method Audio output Audio frequency Transmitter Unit Transmitter section Receiver section Tx frequency - f f 1. Ranges shown for off-center on are maximum. 2. Fish school may not be detected depending on its nature or sea conditions, even if it is located within the display range in use.
Tilt Angle Tilt beam angle Hull Unit Power Supply, Power Consumption Color Display unit Transceiver unit, hull unit Munsell 2.5G 7/2 Newtone No.5 Environmental Conditions Temperature Humidity 0 to 55 , continuously variable i s i 24 VDC, 160 W (average), maximum 280 W (ship’s speed 16 knots, raising transducer) (100 VAC operation with optional rectifier) Panel: N 3.0 Newtone No.