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Reception Test
Select
Reception Test
elements. For the test to start, the SN90 system must be "pinging".
The reception test validates each single element in the transducer, and returns
the status using a simple colour code.
•
: The transducer element is fully operational.
Green
•
: The transducer element offers reduced performance.
Red
•
: The transducer element is not working ("dead").
Black
For more information, observe the tooltip provided for each element rectangle.
A small number of unserviceable transducer elements are accepted, even for
operational use. This is regarded as "graceful degradation". The SN90 system
offers a large number of transceiver channels. 8 identical transceiver boards are
used. If a single channel fails during normal operation, you are not likely to detect
it. Even if several channels fail, you may not see it.
The detection of a faulty channel depends on the physical location of the relevant
transducer element. If faulty channels are grouped together on the transducer face,
this may cause a visible defect in the display presentation. If they are scattered,
the visible defect may be a lot harder to see. In all cases, the echoes from the
neighbouring channels cause an interpolation that will restore a lot of the degraded
presentation.
Which actions to take if single channels fail depend on the operational impact, the
overall performance of the SN90 system, and a cost/benefit assessment. The most
important factor in the cost/benefit assessment is whether you need to replace the
transducer, or just a single transceiver board. If more than 3% of your transducer
elements have failed, we recommend that you contact your dealer for advice.
Note
For further investigations of this issue, use the functionality offered by the
(Element Built In Test Equipment) dialog box.
BITE
Related topics
Testing the noise conditions and the sonar functionality, page 252
Functions and dialog boxes, page 416
Setup menu: functions and dialog boxes, page 448
Diagnostics dialog box, page 459
381294/E
to start an automatic test of the individual transducer
Functions and dialog boxes
Element
551
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