Raymarine DSM250, Owner'S Handbook Manual

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2-2 DSM250 Digital Sounder Module
Planning the Installation
Before you install your system, plan the installation, considering:
• Correct transducer for your application. See document number
81196,
Transducers for Fishfinders Owner’s Handbook .
• Location of the display unit, as described in Section 2.3
• Cable Runs, including cables for an integrated system (to provide
heading and position data, etc.), as described in
Section 2.4 .
EMC Installation Guidelines
All Raymarine equipment and accessories are designed to the best
industry standards for use in the recreational marine environment.
Their design and manufacture conforms to the appropriate Elec-
tromagnetic Compatibility (EMC) standards, but correct installa-
tion is required to ensure that performance is not compromised.
Although every effort has been taken to ensure that they will per-
form under all conditions, it is important to understand what fac-
tors could affect the operation of the product.
The guidelines given here describe the conditions for optimum
EMC performance, but it is recognized that it may not be possible
to meet all of these conditions in all situations. To ensure the best
possible conditions for EMC performance within the constraints
imposed by any location, always ensure the maximum separation
possible between different items of electrical equipment.
For optimum EMC performance, it is recommended that wher-
ever possible :
• Raymarine equipment and cables connected to it are:
•
At least 3 ft (1 m) from any equipment transmitting or cables
carrying radio signals, e.g., VHF radios, cables and antennas.
In the case of SSB radios, the distance should be increased to
7 ft (2 m).
• More than 7 ft (2 m) from the path of a radar beam. A radar
beam can normally be assumed to spread 20 degrees above
and below the radiating element.
• The equipment is supplied from a separate battery from that used
for engine start. Voltage drops below 10 V and starter motor tran-
sients can cause the equipment to reset.