Installation manual

Final tests and measurements
159
851-164510 / Rev.E
11.4 Noise/speed curve
Preparations
In order to make a noise/speed curve for the ship, make the
following settings in the SP90 menu.
1 Select the Setup menu.
2 Push the Test... button to access the System Test menu.
3 Push the Test Config button, and observe the Test Config
submenu appear at the bottom of the menu field.
4 Select Noise & VR to select the menu settings for the
receiving voltage response.
5 Push Close.
6 Observe that the Echo level buttonintheSystem test
menu provides a readout of the current value measured by
the sonar.
Procedure
Observe the following procedure to make the noise/speed curve.
1 Start with 0 knots with the engine running.
2 Use the two Train buttons (arrows) on the Operator panel
to turn the audio line to the different bearings shown in the
Noise measurements table.
→ Refer to table 8.
3 For every new bearing, wait at least 10 seconds before you
make a readout of the new echo level.
4 Enter the results into the table.
5 Increase the speed to 2 knots.
6 Repeat the readouts for the six different bearings.
7 Repeat the procedure with the different speeds and
bearings shown in the table.