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Chapter: 6. Trouble Shooting
The blue area shows the results of the second stage lters which remove data that varies too far from the
standard deviation. The lter type has a tConst (time constant) which is the number of pings used to approve
a value (a form of rolling time average lter). If data is noisy from ping to ping then some data will be
rejected and the limit is set by the noise peak parameter. The Total WT and Total BT shows how many pings
were used to get the present value XX/YY, where XX is longitudinal value and YY is transversal value.
Example: If the FILTER soft key (menu 2) is set to medium (40 tConst, 2 kn noise peak) normal operation
will give a total WT of 40 - 45. A noisy system will give maybe 60 - 200. The higher the FILTER, the slower
the reaction time of the system. High = Good for stability. Low = Good for dynamic operations. The option
run.aver disables the noise peak lter.
The green highlighted section allows the user to observe the return signals from each channel in either water
or bottom mode.
The horizontal axis represent time for the sound to travel down and back from an object or water layer. The
vessel is located at the left edge of the grid, and the right edge represent the range. The vertical axis represent
the magnitude of the received echo signal.
By using the SCOPE button in menu 1, each channel can be selected and detection points as well as noise
levels can be observed. The bottom and water pulses should reach close to the top of the scope screen, while
the noise should be close to the bottom, (rst 2 divisions). Higher than this implies the sensor receiver is
malfunctioning or is noisy. The time base (horizontal scale) of this screen can be changed using the DPT
RANGE button on menu 1.
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