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Simrad SN90 Reference Manual
Illustration:
Read the noise value from the noise circle. Use
the mean value of the readouts at 0 degrees
(straight up).
Procedure
1
If applicable: Make sure that you have
sufficient water depth below the keel before
you lower the transducer.
2
If applicable: Lower the transducer to its
bottom position.
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
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
b
On the
Operation
c
On the
Active
1
Set
Pulse Type
2
Set
Frequency
3
Set
Vertical TX Sector
4
Set
Noise Filter
5
Set the
d
On the
Setup
6
Select
to open the page.
Noise
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.
266
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:
to CW Medium.
to the start frequency:70 kHz
to Narrow.
to Off.
Bottom Filter Threshold
menu: Select
Diagnostics
.
User Settings
to Off.
to Off.
to open the dialog box.
dialog box.
381294/E
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