User manual FURUNO CH-37 OPERATORS MANUAL

[. . . ] COLOR SECTOR SCANNING SONAR MODEL CH-37 Your Local Agent/Dealer 9-52 Ashihara-cho, Nishinomiya, Japan Telephone : Telefax : 0798-65-2111 0798-65-4200 All rights reserved. Printed in Japan FIRST EDITION : JUL. OME-13030 ( TENI ) CH-37 *00080821101* *00080821101* *00080821101* *OME13030E00* *OME13030E00* *OME13030E00* SAFETY INSTRUCTIONS WARNING ELECTRICAL SHOCK HAZARD Do not open the equipment. Immediately turn off the power at the switchboard if water leaks into the equipment or something is dropped in the equipment. Fire or electrical shock can result if a liquid spills into the equipment. [. . . ] COLOR EXIT : : : : : A OFF OFF OFF 16 LOG C(MAX) SQUARE : PRESS MENU KEY Figure 2-14 Sonar menu 3. The selected item is highlighted and the current setting is circumscribed in white. Sonar menu description TX RATE: Selects transmission repetition rate in ten steps. 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. 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. Turn off when no interference exists, otherwise weak echoes may be missed. STABILIZER: Select "ON" when the Motion Sensor MS-100 (option) is connected. SQUARE enhances the strong echoes comparing with LINEAR, resulting in clear and easy-reading picture. 2. 16 E/S Menu 1. Select E/S at the top of the screen. MENU: RANGE SONAR : : : : : : : : BOTTOM/3D 80 320 DUAL E/S 160 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. ON 1/2 LINEAR 1/4 Figure 2-15 E/S menu 2-16 Table 2-1 E/S menu description Item RANGE SHIFT GAIN N. L. IR ADVANCE SPEED Description Selects echosounder range: 40, 80, 160, 240 or 320 (meters). Suppresses interfernce from sonar of other ship or noise from electrical machinery onboard own ship. Select "LOG" or "LINEAR" according to amplifier of echo sounder. COLOR 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°). 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 Freq: 60 kHz Screen Display TX Tilt Sounding Beam RX 16° 13° 60°/16° 13° 45°* Tilt: 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. [. . . ] 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. NEVER use a fuse of a higher rating. FUSE POWER CABLE 1+ 23 SHIELD Bottom echo becomes irregular Rough seas. 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. [. . . ]