Prerequisites
Calibration can only be started with the ME70 in either Normal or Replay mode.
How to open
This function is opened from the Setup menu.
Description
In order to calibrate the ME70, a reference target (calibration sphere) with known target strength (TS) is lowered into the sound beam. The measured target strength is compared with the known target strength of the sphere, and the ME70 is adjusted accordingly.
To successfully calibrate the ME70 you need to place a number of target detections in each sector. The echoes must be distributed within the entire beam cross-section. In order to do this, the target sphere must be physically moved inside the beam during the calibration process. If the sphere location is constant, you will be rewarded with many echoes, but all will be inside the same sector. The number of sphere detections should be approximately the same for each sector, and in total not more than 100 for the whole
beam cross-section.
Any adjustments to the ME70are done automatically by the calibration program. No gain adjustments are required.
TipKongsberg Maritime can supply a variety of copper and tungsten calibration spheres dedicated for different operational frequencies. Each sphere diameter is selected for minimum temperature dependence.
Each calibration sphere must be handled with care to avoid any damage to its surface. When not in use, store the sphere in a household soap solution. All suspension lines must be as thin and clean as possible. Limit knots to a minimum, and keep them small. Even knots have strong echoes!