Simrad SC90, Installation Manual

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419050/B
359
Context
It is always best to do make the noise/speed curve under realistic conditions. This means
that all relevant vessels systems should be in use as under normal operations. However,
if you experience abnormally high noise levels, you may want to repeat the test with
"silent ship" settings. To isolate noise sources, turn individual vessel systems on or off to
monitor any changes in the noise level.
Procedure
1 Make sure that the water depth under the keel permits you to lower the transducer.
2 Lower the transducer to its bottom position.
3 If necessary, establish a separate communication line with the bridge to verify
the vessel speed during the test.
4 Make the following preparations.
a Select the
Horizontal
tab to open the menu.
b Set
TX Power
to Off .
c Select the
Setup
tab to open the menu.
d Select
Test
on the
Setup
menu to open the
System Test
menu.
e Select
Test Config
to open the
Test Config
parameter dialog.
f Select
Noise & VR
to select the
Noise test
settings.
g Select
OK
to save the settings and close each parameter dialog box.
h Select
Test
on the
Setup
menu to open the
System Test
menu.
i Observe the echo level shown in the
Echo Level
"button".
5 Repeat the following cycle for each vessel speed:
a Ask the bridge to set the speed.
b Observe the
Status
parameter dialog box in the bottom right corner of the SC90
presentation. Make sure that the dialog box presents the requested speed.
c On the Operating Panel, press
Train right
and
Train left
(arrows) to rotate the
audio line to the different bearings listed in the result table.
d Read the current echo level displayed by the
Echo Level
"button".
Record the values in the result table.
e Ask the bridge to set the next speed.
6 When all the measurements have been made, type the data (speed and noise) into a
spreadsheet to create the curve.
7 Hoist the transducer to its upper position.
Setting to work