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• If applicable: The transducer is retracted to its upper position.
• The vessel is berthed or at sea. We recommend that the test is done with the vessel
at sea.
Caution
You must never set the SN90 system to ping unless the transducer is submerged in
water. The transducer can be damaged if it transmits in the open air.
For the best possible conditions, the ship must be "silent".
• The water must be as deep as possible. Recommended minimum depth is 100 metres.
• There must be no other vessels in the vicinity.
• The vessel must lie still in the water.
• As much machinery as possible must be turned off. It is particularly important to
turn off electrical motors, as well as cooling systems and hydraulic pumps that may
cause electric noise.
• To prevent interference, all other hydroacoustic instruments must be turned off.
Context
By means of the
Diagnostics
components in the SN90 system are operational. And most important, you can make sure
that all the transceivers channels and transducer elements are functional. Each button
provides a small colour coded indicator.
•
: Status is OK. No actions are necessary.
No indicator
•
: This is a warning. A closer investigation is recommended.
Yellow
•
: This is an alarm. A closer investigation is required.
Red
•
: A device monitored by the diagnostic system is disabled.
Blue
•
: No information is available.
Grey
The
dialog box and functionality is only provided for performance
Diagnostics
monitoring. The functionality offered by the dialog box is not required for normal use of
the SN90 system. The dialog box does not permit you to change any operational settings.
Note
A hull unit may be provided as an option. It allows you to lower and hoist the transducer.
All information and tasks related to the hull unit may be disregarded and omitted if the
SN90 system is installed without this unit.
Procedure
1
If applicable: Make sure that you have sufficient water depth below the keel before
you lower the transducer.
2
If applicable: Lower the transducer to its bottom position.
381294/E
functionality, you can easily determine if the hardware
Maintenance procedures
255
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