Kongsberg Simrad SU90 Manual page 39

• If a single element is receiving, but not transmitting, the rectangle is normally
presented in lighter shades of blue.
• If a transceiver board is "dead" (no transmit, no receive), all the transducer
elements connected to the board are easily spotted because they are all black.
8 Test the transmitter performance.
a Set
Tx Power
b Set
Start sample
c Set
Sample range
d Check if you have any black lines in the sample range.
9 Make sure that the maximum number of unserviceable ("dead") elements does
not exceed 4.
A small number of unserviceable transducer elements are accepted, even for
operational use. This is regarded as "graceful degradation".
The SU90 system offers a large number of transceiver channels. 12 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.
10 If any weak elements are detected, record these in the result table.
11 If any unserviceable transducer element (black lines) are detected, record these
in the result table.
12 Make a screen capture of the
Save the screen capture using a unique file name that identifies context, date, time
and vessel. Attach the image file to the electronic copy of the test report. Print the
image in colour if the report is submitted on paper.
13 Finish the test.
a Close the
Element BITE
b Close the
Diagnostics
c Set
Tx Power
d Set
Operation
e Hoist the transducer back up to its upper position.
409977/C
to Maximum.
to 50
to 2000
page.
B-Scan
(Element Built-In Test Equipment) dialog box.
dialog box.
to Off.
to Inactive.
Test procedures
39