NOTES ON ELECTRICAL INTERFERENCE
External electrical interference is characterised by persistent,
random numbers on the display which obscure the true depth
reading on the depth sounder.
This is cause by large amplitude voltage “spikes” generally
associated with the engine’s alternator and/or ignition system which
has not been properly suppressed. These “spikes” may find their way
into the sensitive amplifier section of the depth sounder in two ways:
(a)
(b)
To reduce the possibility of induced interference from the engine’s
generator and/or ignition system, choose a position as far away
from the engine as possible and run the cable from the transducer
as far as practicable from the engine. Do NOT cut the transducer
cable, but stow excess away from any possible source of electrical
interference.
GETTING STARTED
When the Clipper Echo sounder is first turned on, it automatically
performs a number of self-test processes, and after a brief delay
switches on the backlight illumination at the factory pre-set level. It
then displays a symbol representing the keel offset (which is pre-set
in the factory to zero, as shown on Figure 2) for about one second.
Under normal circumstances, the display then almost immediately
shows the word DEPTH, and the depth below the transducer, as
shown on Figure 3. However, if the transducer has not been
connected, or no echoes are received for any other reason, the word
DEPTH is not displayed and the unit waits for another five seconds
before showing “out”. If that happens, check the connections to the
transducer, and that it has been correctly installed.
5
Through the craft’s common power supply or
Through direct radiation from the source of interference.
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