Onwa KF-667 manual Measuring Depth to a Fish School, Scope Display

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2.9 Measuring Depth to a Fish School

The VRM (Variable Range Marker) functions to measure the depth to fish schools or other echo.

1.Press[ ]or[]to place the VRM on an echo.

2.Read the VRM range just above the VRM.

2.10 A-scope Display

This 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. To turn the A-scope display on or off press the [SIG LEV] and [ALARM] keys together.

Normal display

A-scope display

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Contents Model KF-667 Safety Instructions Table of Contents Features IntroductionPage Principle of Operation System Configuration Display UnitPower TransducerTD/Temp CONTROLS, Indications Control FunctionBrill Indications VoltageDisplay Mode Selection, Description Turning the Power On/OffAdjusting Brilliance Display mode selectionDisplay mode description 200K, 50K high frequency, low frequency modeDual frequency mode Zoom mode high or low frequency Marker ZoomHow it works Adjusting GainAutomatic Operation Enabling automatic operationSelecting Picture Advance Speed Display Range SelectionBasic range selection Erasing Weak Echoes Range shiftingMeasuring Depth to a Fish School Scope DisplayMenu Operation Menu selectionMain menu description System MenuSystem menu description Menu item Description System MenuSuppressing Interference Suppressing Low Level NoiseAlarms Alarm descriptionSelecting Background and Echo Colors Activating/deactivating an alarm Silencing the buzzerWhite Marker Fish School Echoes Interpreting the DisplayZero Line Bottom EchoSurface Noise/Aeration Replacement of fuse MAINTENANCE,TROUBLESHOOTINGMaintenance General checkingCleaning Maintenance of the transducerBasic Troubleshooting Basic troubleshootingWater Temperature Sensor option Check Transducer CheckMenu Tree MENU1Specifications on Color Video Sounder KF-667Power Supply Index