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Simrad MS70 Installation Manual
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 cable 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
Installation summary, page 41
Installation principles, page 45
Acoustic noise, page 60
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 MS70 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 MS70 installation must be
handled separately depending on the hull design and the other electrical and mechanical
systems installed on the vessel.
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331549/C
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