Kongsberg Simrad ST90, Reference Manual

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442704/A
Result
For each transmit frequency (in kHz), write down the measured noise levels (in dB).
Frequency Maximum Average
70 kHz
XXXXX kHz
90 kHz
Related topics
Maintenance procedures, page 186
Testing the noise conditions and the sonar functionality, page 254
Noise page, page 552
Making a noise/speed curve to determine vessel noise
The performance of the ST90 system will always be limited by different noise sources.
During this test, noise measurements are done for different vessel speeds. The weather and
sea conditions for the noise measurements will be those at the time of the test.
Prerequisites
The ST90 system is turned on and operates normally. The vessel is at sea. Recommended
minimum depth is 100 metres. If the ST90 system is operated from any other compartment
than the bridge, an open two-way oral communication channel with the bridge is required.
You need the following equipment:
• Personal computer
• Spreadsheet program
If you wish to do the test with a "silent ship" the following prerequisites must be met:
• The water must be as deep as possible. Recommended minimum depth is 100 metres.
• There must be no other vessels in the vicinity.
• As much machinery as possible must be turned off. It is particularly important to turn
off electrical motors, as well as cooling systems and hydraulic pumps that may cause
electric noise.
• To prevent interference, all other hydroacoustic instruments must be turned off.
Simrad ST90 Reference Manual