Calibration Merging dialog box
The Merge Calibration dialog box is used for merging two sets of calibrations for the same beam mode. A challenge using a smaller sphere is the smaller sphere being more easily subject to conditions in the sea such as varying currents, temperature and salinity. A large sphere, such as 75 mm or 85 mm of Tungsten, will not yield echoes which can be confused with fish and will have a more stable and stronger echo. Combining a small sphere calibration with a large sphere calibration will therefore reduce the false echoes and the impact of the environmental conditions on the calibration results and will be valid for all the beams. The calibration result are used to set coefficients for target strength and must therefore be as correct and complete as possible in order to give the best target strength readingsA calibration procedure is always performed for one specific beam mode. Using a system calibrated for several frequencies allows the results from different objects to be analysed in a survey.
How to open
The Calibration Merging dialog box is opened from the Beam Mode dialog box when you select Merge calibration from 2 spheres.
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Description
When the Calibration Merging dialog box opens, it displays the primary calibration selected for merging on the left side and the options for secondary calibration on the right side.You can scroll up and down the list of available calibrations. Select a a calibration to see the calibration description of the calibration beneath. The name of the new calibration data set after a merge must be entered in this dialog box. There is also an option for deleting the two original calibration data sets. Deleting source calibration data sets will reduce the storage place required.
Details
Selected primary calibration
Displays the name of the primary calibration data. The primary calibration data is selected in the Beam Mode dialog box.
Select secondary calibration
Displays a list of calibration data for the beam mode. Select one of these in order to merge with the primary calibration data.
Calibration Description
Displays the calibration data description for the primary and secondary calibrations.
Enter the name for the new, merged calibration
Choose a descriptive name for the merged calibration data set.
Delete source calibrations when merging is complete
This is a tick box which you need to tick if you want to delete the primary and secondary calibration data after a merge. The source calibration data is deleted when you select Ok or Apply in the dialog box.