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Fig 2: Raw echo plus near and far blanking.
The shaded left hand side of the screen shows the near blanking and the shaded
right hand part of the screen the ‘far blanking’ the ultra unit will measure 20%
further than its programmed empty distance as a factory setting, this is known as
‘far blanking’. The near blanking is the area just in front of the transducer where
measurement is not possible.
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