Furuno Ls4100 manual Suppressing Interference, Suppressing Low Level Noise, Forms of interference

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1.10Suppressing Interference

Interference from other acoustic equipment operating nearby or other electronic equipment on your boat may show itself on the display as shown in the figure below.

To suppress interference, do the following:

1.Press the [MENU/ESC] key to open the main menu.

2.Use ▲ or ▼ to choose NOISE LIMIT from page 1 of the menu.

3.Press ► to show the options window.

4.Use ▲ or ▼ to choose the degree of suppression desired; Off, Low, Medium, or High (highest).

5.Press the [MENU/ESC] key to close the menu.

Interference from	Electrical interference
other sounder

Forms of interference

Turn the noise limiter off when no interference exists, otherwise weak echoes may be missed.

1.11Suppressing Low Level Noise

Low intensity “speckles” may appear over most of screen. This is mainly due to sediment in the water or noise. These can be suppressed by adjusting CLUTTER on the menu. When the automatic mode is on, clutter is automatically rejected. To suppress low level noise in manual sounder operation, do the following:

1.Press the [MENU/ESC] key to open the main menu.

2.Use ▲ or ▼ to choose CLUTTER from page 1 of the menu.

3.Press ► to show the options window.

4.Use ▲ or ▼ to choose the degree of suppression desired; 1, 2, 3 ,4, 5 or

6.The higher the number the greater the suppression.

5.Press the [MENU/ESC] key to close the menu.

To turn off low-level noise suppression, choose Off at step 4 and then press the [MENU/ESC] key.

Clutter appearance

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Contents Echo Soundr Table of Contents Safety Instructions Safety Instructions for the Installer Iii FeaturesForeword Word to LS-4100 OwnersStandard supply System configurationSystem Overview Equipment listsControl Description Power On/OffHow to remove the hard cover OperationChoosing a Display, Frequency Adjusting Display Contrast, BrillianceBrilliance/contrast adjustment window Mode selection window50 kHz Single frequency displayDual frequency display Marker-zoom displayBottom-zoom display Bottom-zoom displayBottom-lock display Nav data displaysChoosing automatic operation Menu Operating ProcedureAutomatic Operation How automatic operation worksGain offset Choosing the manual modeManual Operation Range offsetShifting the range Adjusting the gainPicture advance options window How to measure depth with the VRMMeasuring Depth Choosing Picture Advance SpeedClutter appearance Suppressing InterferenceSuppressing Low Level Noise Forms of interferenceScope display Erasing Weak EchoesScope Display Appearance of weak echoesAlarm menu AlarmsAlarm description Activating an alarmFish level options Depth, temperature, speed setting WindowWaypoints Silencing the buzzerWaypoint data display Registering a waypoint on the screenRegistering waypoint by L/L KHz displayWaypoint list Setting destination waypointEditing waypoints Erasing waypointsNav data display-1 Setting Up Nav Data DisplaysNAV Data Setup window Nav data window and item displayableOther Menu Items NAV data display-2HUE Picture Color Deep Gain How white line worksSystem menus Water temperature display wide, FSystem Menu System MenuNav window Page MAINTENANCE, Troubleshooting Installation menu TroubleshootingDiagnostics Troubleshooting tableTest patterns Memory ClearTest Pattern Clear memory displayInstallation Display UnitThru-hull Mount Transducer Suitable transducer mounting locations Thru-hull mount transducer dimensionsTypical thru-hull mount transducer installations Acceptable transducer mounting locations520-5PWD Installing the 520-5PWD on a flat hullTransom Mount Transducer Transducer preparationInstalling the transom mount transducer on a deep-V hull Installing the 525-5PWD525-5PWD Inside-hull Transducer Triducer 525ST-MSD Pre-test for speed and temperatureOptional Triducer Final preparationMounting location on single drive boat Installation of bracketMounting location Height required at mounting locationSensor position and transom angle AdjustingCable routing Vertical adjustment and cable routingAttaching the sensor to the bracket Attaching the sensor to the bracketOptional Water Temperature/Speed Sensor Power connector Establishing the groundOptional equipment Water temp/speed sensor IEC 61162-1 Data SentencesNmea PORT, Nmea MIX Installation MenuBottom level display Waas options windowSpecifications of Echo Sounder LS-4100 Page Page Display Unit 00014698000