Simrad EC150-3C, Installation Manual, Page: 57 / 150

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Related topics
Acoustic noise, page 52
Installation summary, page 30
Electrical self noise
Electrical or electronic self noise is picked up or generated in any other part of the
equipment than the transducer.
Hum picked up by the transducer cables or picked up from the power supply is usually
the most common source of electrical self noise. 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 52
Installation summary, page 30
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 EC150-3C 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 EC150-3C installation
must be handled separately depending on the hull design and the other electrical and
mechanical systems installed on the vessel.
Preparations