Prerequisites
The CS90 is installed as specified in this manual.
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The CS90 is turned on, and it is working normally. |
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The CS90 is in Normal mode, but TX Power is set to Off to prevent transmission. |
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The transducer is retracted to its upper position. |
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The vessel is berthed or at sea. |
Neither tools nor instruments are required.
CautionYou must never set the CS90 to "ping" unless the transducer is submerged in water. The transducer may be damaged if it transmits in open air.
For the best possible conditions to complete the test, the ship must be "silent".
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The water must be as deep as possible. Recommended minimum depth is 100 metres. |
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There must be no other vessels in the vicinity. |
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The vessel must lie still in the water. |
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As much machinery as possible must be switched off. It is particularly important to switch off electrical motors, as well as cooling systems and hydraulic pumps that may cause
electric noise. |
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To prevent interference, all other hydroacoustic instruments must be switched off. |
Context
By means of the BITE (Built-In Test Equipment) functionality, you can easily determine if the CS90 hardware is operational. And most important, you can make sure that all the transceivers channels and the transducer elements are functional. To open the different pages in the BITE (Built-In Test Equipment) dialog box, use the large "buttons" on the left hand side. Each button provides a small colour coded indicator.
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No indicator: Status is OK. No actions are necessary. |
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Yellow: This is a warning. A closer investigation is recommended. |
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Red: This is an alarm. A closer investigation is required. |
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Blue: A device monitored by the BITE system is disabled. |
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Grey: No information is available. |
NoteThe BITE (Built-In Test Equipment) dialog box and functionality is only provided for performance monitoring. The functionality is not required for normal use of the CS90. The BITE dialog box does not permit you to change any operational parameters.
Procedure
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Make sure that you have sufficient water depth below the keel before you lower the transducer. |
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Lower the transducer to its bottom position. |
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Select the default settings.
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On the Main menu, select User Settings. |
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Observe the Factory Settings list. |
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Select the setting you wish to use. |
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Select Activate Selected Setting. |
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Select OK to apply your changes and close the User Settings dialog box. |
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Make the following preparations.
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Open the Operation menu.
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Open the Active menu.
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Set Pulse Type to CW Medium. |
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Set Frequency to 70 kHz. |
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Set Vertical TX Sector to Narrow. |
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Set Noise Filter to Off. |
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Set the Bottom Filter Threshold to Off. |
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Open the Setup menu.
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Select BITE to open the BITE (Built-In Test Equipment) dialog box. |
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Select Transceiver to open the page.
This page provides a graphic presentation of the 16 transceiver boards. The presentation reflects their physical location in the Transceiver Unit. Only static information is provided. The Board Information parameters offer key information about the supply power to the selected transceiver board, as well as the environmental conditions.
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Make sure that all the 16 transceiver boards are fully functional. |
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Select Transducer to open the page.
The Transducer page presents all the elements that are used in the CS90 transducer. The presentation attempts to organize the elements in the same manner as in the physical transducer. The transceiver boards are shown as "buttons". Select a transceiver board to highlight the elements that are physically connected to the board.
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Select Reception Test to start an automatic test of the individual transducer elements.
The reception test validates each single element in the CS90 transducer, and returns the status using a simple colour coding.
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Green: The transducer element is fully operational. |
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Red: The transducer element offers reduced performance. |
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Black: The transducer element is not working ("dead"). |
For more information, observe the tooltip provided for each element rectangle.
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Verify that the number of unserviceable ("dead") elements does not degrade the CS90 performance.
A small number of unserviceable transducer elements are accepted, even for operational use. This is regarded as "graceful degradation”.
The CS90 operates with 480 individual channels handled by 16 transceiver boards. If a single channel fails during normal operation, you are not likely to detect it. Even if several channels fail, you may not see it.
The detection of a faulty channel depends on the physical location of the relevant transducer element. If faulty channels are grouped together on the transducer face, this may cause a visible defect in the CS90 presentation. If they are scattered, the visible defect may be a lot harder to see. In all cases, the echoes from the neighbouring channels cause an interpolation that will restore a lot of the degraded presentation.
Which actions to take if single channels fail depend on the operational impact, the overall performance of the CS90, and a cost/benefit assessment. The most important factor in the cost/benefit assessment is whether you need to replace the transducer, or just a single transceiver board. If more than 3% of your transducer elements have failed, we recommend that you contact your dealer for advice.
NoteFor further investigations of this issue, use the functionality offered by the Element BITE (Element Built In Test Equipment) dialog box.
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If the result from the reception test shows a number of transducer elements that are either defective or offer reduced performance,
repeat the test.
With the vessel in port, the environmental conditions are not satisfactory. In the shallow waters of the port, noise from other vessels, dockyard workers or machinery will cause unreliable test results. If you do this tests in a busy harbour, or with noise sources present, the sensitive receivers will detect all the noise in
the nearby waters. Excessive noise or interference may be misinterpreted as physical defects.
You may need to repeat the test several times, and - if necessary - implement a "silent ship" to improve the conditions.
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Finish the test.
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Close the BITE (Built In Test Equipment) dialog box. |
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Set Operation to Inactive. |
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Hoist the transducer back up to its upper position. |
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Result
Requirements |
Results |
The maximum number of unserviceable elements is 5. |
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Date and signature:
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Further requirements
If the noise level is higher than specified, you must check the reason(s) for this.
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Check the grounding of the Transceiver Unit. |
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Verify that other electric equipment and/or machinery on board, such as cooling systems, hydraulic pumps, electric motors
etc, do not influence on the noise reading. Switch off as much machinery as possible, especially electrical motors. |
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Check for interference from other hydroacoustic systems. |
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Check for environmental noise, such as other vessels in the vicinity or animal life. |