Kongsberg Simrad EK80, Installation Manual

Page: 41 / 354

394149/D
39
Electrical noise
The quality of the power supply is crucial to reduce 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 cable 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.
Note
Ensure maximum physical distance between the Wide Band Transceiver (WBT) and the
Power Supply Unit. This is important to reduce noise.
Related topics
Installation requirements, page 37
Simrad EK80, page 13
Dry docking requirements
Whenever one or more transducers are mounted under the vessel’s hull, special
considerations must be made prior to dry docking.
Make sure that ample clearance is provided under the transducers when you are placing
the vessel in dry dock. Do not place supporting blocks or structures in the vicinity of
the transducers.
Note down the location of each transducer on the vessel’s docking plan.
Prior to dry docking, turn off the EK80. If necessary, disengage the circuit breaker.
Label the Processor Unit and/or the circuit breaker clearly to prevent anyone from
accidentally turning on the EK80.
Related topics
Installation requirements, page 37
Simrad EK80, page 13
Requirement for classification approval
Classification approval is required for the EK80 installation.
The transducer installation must be approved by the vessel’s national registry and
corresponding maritime authority and/or classification society. The shipowner and
shipyard doing the installation are responsible for obtaining and paying for such approval.
Related topics
Installation requirements, page 37
Simrad EK80, page 13
Simrad EK80