Calibration procedure using a single sphere
This procedure explains how to do a calibration using a single sphere.
Prerequisites
The vessel must be set up with appropriate equipment. Appropriate spheres must be used.
Context
Procedure
1 Position the reference sphere in the central beams of the system.
2 Select Beam Mode Administration to open the dialog box.
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The Beam Mode Administration dialog box allows you to create and delete beam modes for the ME70. By means of the Beam Mode dialog box you can also view an edit the beam modes.
3 Select the beam to be calibrated.
4 Select Edit on the selected mode to open the Beam configuration dialog box.
5 Open the Calibration tab.
6 Check that the calibration has been set to Nominal performance.
7 Open the Fan of beams tab.
8 Check all All beams to be split beams.
Note
This is not a necessary if all the beams are already defined as split beams.
9 Activate the mode.
10 Start pinging
11 On the Setup menu, select the red circle in the Record button to start recording.
12 Check that the sphere is visible on the ME70 display.
13 On the Setup menu, select Calibration.
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14 Select File in the Setup menu of the Calibration dialog box.
15 Check that the correct sphere is selected. Adjust the depth limits to cover the depth of the sphere.
16 Select Start in the Calibration dialog box to start data collection.
17 Observe the red dots as new detections of the sphere in the Selected Beam and Targets strength information field.
18 Select the beam to be displayed in the Selected Beam information field by clicking the Beam mode or Beam list.
19 Select TS-Data tab to observe numerical data for the detected targets in the selected beam.
20 Move the sphere in the transverse and fore-and-aft directions to cover all beams.
Important
Do not change the depth. You should have at least 5–10 hits in each beam.
21 If required, you may need to adjust the Target Depth Limits in the Setup dialog box for the outer beams. This is necessary if the sphere unintentionally changes depth when it is moved from beam to beam.
a Select Stop in the Calibration dialog box to stop the data collection.
b Adjust the Target Depth Limits in the Setup dialog box.
c Select Start the menu of the Calibration dialog box.
22 When all beams are covered, stop data collection by selecting Stop in the menu system in the Calibration dialog box.
23 If required, click the TS-Data tab for each beam and suspend detections that are caused by fish, weights or other reflectors in the sea.
Note
This is important and will often improve the result estimates and the statistics.
24 When the quality of the data is acceptable, save the calibration coefficients to the mode by selecting File and Save As in the Calibration dialog box menu. The new set of calibration coefficients will be selected for the beam configuration.
•  The name and description you specify will identify this set of calibration data in the Calibration tab in the BeamConfiguration dialog box.
•  When you save the calibration data the current beam mode may be changed accordingly, and the files containing detailed reports (XML) are generated.
•  The detailed and summary reports,may be printed. They represent the documentation for the calibration for the selected beam mode.