2 Preparing for ADCP calibration
Prior to velocity measurement calibration you must check that your Reference Manual system is fully functional.
Context
It is necessary to measure the environmental conditions before the calibration starts.
Procedure
1 Start the EK80 program.
a Check that the EK80 system and all the transceivers and transducers are installed correctly.
b Set Operation to Normal.
c Start "pinging".
d Verify that the EK80 system is fully operational on all channels.
2 Measure the water salinity and temperature between the transducer and the planned depth of the calibration sphere.
3 Calculate the average salinity and temperature values, and type these into the Environment dialog box.
The sound velocity is automatically calculated by the EK80 Processor Unit. The corresponding absorption coefficient is calculated by the echo sounder according to Francois & Garrison, JASA December 1982.
Image
Sound speed in water for different salinity values
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Sound absorption for different salinity values
Related topics
Calibration procedures for ADCP
ADCP calibration summary