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Ground loops
Ground loop noise is caused when the equipment is grounded at two or more points that
have different potentials. This inconsistency creates a current path causing electromagnetic
interference (EMI). This interference appears as rings in the sonar view (usually at a
constant range). The thickness and intensity of the rings will depend on the EMI generated
by the ground loop.
Bend radius
Always observe the specified cable bend radius. Disturbing the cable geometry can
introduce crosstalk interference. The bend radius is usually ten times the cable diameter.
Radio frequency interference
All cables that are to be permanently installed within 9 m (30 ft) of any source of Radio
Frequency (RF) interference such as a transmitter aerial system or radio transmitters, must,
unless shielded by a metal deck or bulkhead, be adequately screened
Suitable screening can be established using sheathing, braiding or other suitable material. In
such a situation flexible cables should be screened wherever possible.
It is important that cables, other than those supplying services to the equipment installed
in a radio room, are not installed through a radio room, high power switch gear or other
potential sources of interference. Cables which must pass through a radio room must be
screened by a continuous metal conduit which must be bonded to the screening of the radio
room at its points of entry and exit.
Physical protection of cables
Cables exposed to the risk of physical damage must be enclosed in a steel conduit or
protected by a metal casing unless the cable's covering (for example armour or sheath) is
sufficient to protect it from the damage risk.
Cables exposed to an exceptional risk of mechanical damage (for example in holds,
storage-spaces and cargo-spaces) must be protected by a suitable casing or conduit, even
when armoured, if the cable covering does not guarantee sufficient protection for the cables.
Metallic materials used for the physical protection of cables must be suitably protected
against corrosion.
Summary of Contents for M3 Sonar FLS
Page 1: ...Installation Manual M3 Sonar FLS Forward Looking Multibeam sonar ...
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Page 8: ...6 922 20297011 1 0 M3 Sonar FLS ...
Page 72: ...70 922 20297011 1 0 Sonar Head outline dimensions M3 Sonar FLS Installation Manual ...
Page 73: ...922 20297011 1 0 71 Drawing file ...
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Page 98: ... 2020 Kongsberg Mesotech ...