268
442704/A
Illustration:
Read the noise value from the noise circle. Use the
mean value of the readouts at 0 degrees (straight up).
Procedure
1
Make sure that you have sufficient water depth
below the keel before you lower the transducer.
2
Lower the transducer to its bottom position.
3
Select the default settings.
a
On the
Main
menu, select
User Settings
.
b
Observe the
Factory Settings
list.
c
Select the setting you want to use.
d
Select
Activate Selected Setting
.
e
Select
OK
to apply your changes and close the
User Settings
dialog box.
4
At the bottom of the display presentation, select a suitable presentation mode, and
activate the
Horizontal
view.
5
Make the following preparations.
a
On the
Main
menu: Set
Range
to
1500 m
.
b
On the
Operation
menu: Set
Tx Power
to
Off
.
c
On the
Active
menu:
1
Set
Pulse Type
to
CW Medium
.
2
Set
Frequency
to the start frequency:70 kHz
3
Set
Vertical TX Sector
to
Narrow
.
4
Set
Noise Filter
to
Off
.
5
Set the
Bottom Filter Threshold
to
Off
.
d
On the
Setup
menu: Select
Diagnostics
to open the dialog box.
6
Select
Noise
to open the page.
7
Establish a separate communication line with the bridge to verify the vessel speed
during the test.
8
Measure the flow noise versus the vessel speed.
a
Ask the bridge to increase the vessel speed to the maximum permitted speed
for the hull unit.
b
Wait until maximum speed has been obtained.
Simrad ST90 Reference Manual
Summary of Contents for Simrad ST90
Page 1: ...kongsberg com simrad Simrad ST90 REFERENCE MANUAL ...
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Page 337: ...442704 A 335 Related topics Sonar views page 326 User interface ...
Page 413: ...442704 A 411 Related topics Menu system page 375 Display menu page 384 Menu system ...
Page 631: ...442704 A 629 Related topics Concept descriptions page 626 Concept descriptions ...
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Page 688: ... 2021 Kongsberg Maritime ISBN 978 82 8066 211 8 ...
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Page 690: ...Reference Manual Simrad ST90 ...