Kongsberg Simrad SN90 Reference Manual page 265

c Read the noise value from the noise circle.
d Record the values in the result table.
e Repeat for every 2 kHz up to and including the highest test frequency: 120 kHz
1 Increase the operating frequency with 2 KHz.
2 Read the noise value from the noise circle.
3 Record the values in the result table.
f 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 Finish the test.
a Close the
Diagnostics
b If applicable: Hoist the transducer back up to its upper position.
Result
Speed
0
2
4
6
8
10
12
14
16
381294/E
dialog box.
Speed/Frequency/Noise
Frequency
Maintenance procedures
Noise level
263