Kongsberg Simrad EK80, Installation Manual

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Reducing rattle noise
Ensure that no parts near the transducers can rattle as a result of water flow or vibrations.
Reducing interference
Interference from the transmission pulses from other hydroacoustic instruments on
board the vessel is difficult to avoid. The problem may be reduced by choosing the
working frequencies carefully and to some extent by separating the different transducers.
On vessels with a large number of separate hydroacoustic systems installed and in
simultaneous use, a separate synchronizing system (for example the K-Sync) should
be considered.
Reducing electrical noise
These points must all be considered to reduce electrical noise on an EK80 system.
• Place the transducer cables in a metal conduit all the way from the transducer to
the transceiver. Terminate the conduit as close to the transducer and transceiver as
possible.
• Make sure that the transducer cables are completely separated from other cables,
boxes, other potential noise sources.
• Make sure that all units are properly grounded.
• Use shielded cables with correct grounding.
• Separate the EK80 cables from other cables with high voltages, large currents or
transients. Place all high voltage power cables in metal conduits.
• If you more than one Wide Band Transceiver (WBT), install these in such a way that
the transducer cables have the maximum distance to the power and Ethernet cables.
• Ensure maximum physical distance between the Wide Band Transceiver (WBT) and
the Power Supply Unit.
• Ensure maximum physical distance between each Power Supply Unit.
• If possible, install the transceivers in a sonar room that is electrically shielded.
Related topics
Acoustic noise, page 54
Preparations, page 43
Vessel coordinate system
The vessel coordinate system is established to define the relative physical locations
of systems and sensors.
When you have several different sensors and transducers on your vessel, and you wish
each of them to provide accurate data, you need to know their relative physical positions.
The antenna of a position sensor is typically mounted high above the superstructure,
Preparations