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Quality assurance of EK80 data
The Simrad EK80 Wide band scientific echo sounder is a precision instrument for
scientific measurements.
The EK80 has been designed for target strength measurements of objects in the water
column. In order to obtain precision data that are both detailed and correct, it is necessary
to align the transducer, measure the location and offset of each sensor in relation to the
vessel’s coordinate system, and calibrate the complete EK80 prior to use.
Note
Modest accuracy requirements apply when your EK80 system is only used to investigate
objects in the water column. When used for acoustic Doppler current profiler (ADCP)
measurements the accuracy requirements are increased.
The quality assurance tasks required for EK80 include:
• Aligning the transducer during installation
• Dimensional surveying
• Calibration
The alignment and dimensional surveying must be done during the EK80 installation
with the vessel in dry dock. The first calibration is normally done at sea during the Sea
Acceptance Test. We strongly recommend that calibration is repeated before and after
each survey. This is important for achieving high-quality measurement results.
Alignment
The alignment tasks required for EK80 include:
• Measure and adjust the transducer to ensure that it has been mounted horizontally
within the given tolerances.
• Measure and adjust the transducer to ensure correct orientation.
Note
Modest accuracy requirements apply when your EK80 system is only used to investigate
objects in the water column. If this is the case the alignment of the transducer can be
omitted.
When used for acoustic Doppler current profiler (ADCP) measurements the accuracy
requirements are increased. Aligning the transducer for correct installation within the
given tolerances requires professional skills. The installation engineers from Kongsberg
Maritime are neither equipped nor trained to align a transducer, and they have no means
of verifying the results until calibration at sea has been done.
Dimensional surveying
The dimensional surveying tasks recommended for EK80 include:
Summary of Contents for Simrad EK80
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