Important Notice
Page 2 DM4E, DM4, DM4 DL Operating Manual
must be developed so that couplant is
used and applied in a consistent
manner to minimize variations in
couplant layer thickness and errors in
test results. Calibration and actual
thickness being measured. This effect,
commonly known as “doubling,” can
occur below the minimum specified
range of the transducer. If the trans-
ducer being used is worn, doubling is
possible at a thickness greater than the
minimum of the specified range.
When using a new transducer, any
reading which is less than twice the
minimum specified range of the trans-
ducer may be a “doubled” reading, and
the thickness of the material being tested
should be verified by the use of other
methods. If the transducer shows any
sign of wear, doubling may occur at a
thickness greater than twice the mini-
mum of the specified range. This
thickness should be determined by
calibrating the instrument/transducer
combination on reference blocks that
represent the complete range of possible
thicknesses that may be encountered in
testing. This is particularly important
when the test piece is being ultrasonically
measured for the first time or in any case
where the history of thickness of the test
specimen is unknown.
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