Kongsberg Simrad ES80, Руководство по установке, Страница: 61 / 312

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Electrical self noise
Electrical or electronic self noise is picked up or generated in any other part of the equipment
than the transducer.
The most common source of electrical self noise is hum. The hum is normally generated
by a power supply. It is then picked up by the transducer cables and/or sensitive electronic
circuitry. At higher frequencies – where rather wide bandwidths are necessary – the noise
from components, transistors or other analogue electronic may be a limiting factor.
Related topics
Acoustic noise, page 53
Preparations, page 41
Some means to reduce acoustic noise
Several factors are contributing to the performance of the hydroacoustic equipment used on
board a vessel. Careful planning of the ES80 installation may reduce the acoustic noise.
Unfortunately, it is impossible to simply provide a number of specific procedures to reduce
the noise.
An important factor is the physical location of the transducers. This depends on the vessel's
design and construction, how the hull is shaped, and how the water runs along the hull.
Other factors deal with other equipment mounted on board, and this will also be vessel
dependant. At moderate ship speeds the machinery noise is usually dominant. At medium
speeds the flow noise increases more rapidly and takes over, while at higher speed the
propeller noise will be the main contributor.
Note
The information here must be considered as general advice. Each ES80 installation must be
handled separately depending on the hull design and the other electrical and mechanical
systems installed on the vessel.
Preparations