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Simrad SN90 Reference Manual
3
Select the default settings.
a
On the
Main
b
Observe the
c
Select the setting you want to use.
d
Select
Activate Selected Setting
e
Select
OK
4
Make the following preparations.
a
On the
Main
b
On the
Operation
to start pinging.
c
On the
Setup
5
Select
Transducer
The
Transducer
presentation attempts to organize the elements in the same manner as in the physical
transducer. The transceiver boards are shown as "buttons". Select a transceiver
board to highlight the elements that are physically connected to the board.
6
Select
Reception Test
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.
7
Make sure that the number of unserviceable ("dead") elements does not degrade
the performance of the SN90 system.
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
256
menu, select
User Settings
list.
Factory Settings
.
to apply your changes and close the
menu: Set
to 1500 m.
Range
menu: Set
Tx Power
menu: Select
Diagnostics
to open the page.
page presents all the elements that are used in the transducer. The
to start an automatic test of the individual transducer elements.
.
User Settings
to Maximum (or any other power rating)
to open the dialog box.
dialog box.
381294/E
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