Prerequisites
The CS90 is turned on, and it is working normally. The vessel is at sea. Recommended minimum depth is 100 metres.
If the CS90 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:
For the best possible conditions to complete the test, the ship must be "silent".
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There must be no other vessels in the vicinity. |
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As much machinery as possible must be switched off. It is particularly important to switch off electrical motors, as well as cooling systems and hydraulic pumps that may cause
electric noise. |
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To prevent interference, all other hydroacoustic instruments must be switched off. |
Context
In order to measure the noise, you must record the noise value using the functionality in the BITE dialog box. Since the noise will vary with each ping, you must make five measurements for each vessel speed, and then calculate the average
noise.
TipIf you record all the raw data during the noise test, you can repeat the test later using the replay file. You may then use more than five noise samples for each vessel speed to make a more accurate curve.
It is always best to do make the noise/speed curve under realistic conditions. This means that all relevant vessels systems should be in use as under normal operations. However, if you experience abnormally high noise levels, you may want to repeat the test with "silent ship" settings. To isolate noise sources, turn individual vessel systems on or off to monitor any changes in the noise level.