Kongsberg Simrad ST90, Reference Manual

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• 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.
Note
With the vessel in port, the environmental conditions are not satisfactory. In the shallow
waters of the port, noise from other vessels, dockyard workers or machinery will cause
unreliable test results. If you do this tests in a busy harbour, or with noise sources present,
the sensitive receivers will detect all the noise in the nearby waters.
Context
To measure the noise, observe the noise values provided on the
Noise
page in the
Diagnostics
dialog box.
Tip
If you record all the raw data during the noise test, you can repeat the test later using
the replay file.
You may wish to make the noise/speed curve under realistic conditions. This means that all
relevant vessels systems are in normal use. If you experience very high noise levels, you
may wish to repeat the test with "silent ship" settings.
Note
When the transducer is fully lowered, the speed of the vessel must not exceed the maximum
speed permitted for the hull unit. This maximum speed depends on the physical size of the
transducer, the mechanical construction of the hull unit, and how far down the transducer
has been lowered. The
System Protection
page allows you to define a limit that triggers an
alarm if the maximum speed is exceeded. The
System Protection
page is located in the
Installation
dialog box.
Maintenance procedures