910-269-EN, Rev. B, June 2011
156 Chapter 9
To verify the refracted angle
1.
Position the probe over the appropriate angle mark on the block (45° in this
example).
Figure 9-14 The IIW block with probe at the 45° mark
2.
Move the probe backward and forward to maximize the amplitude of the echo
coming from the large circular hole in the side of the block. The circular hole may
be filled with Plexiglas, but the procedure is the same.
Press
[PEAK MEM]
to help find the peak of the signal.
3.
Hold the probe stationary once the signal amplitude reaches a maximum’ and
then note the degree mark on the block that is aligned with the BIP, which was
marked on the side of the wedge in the procedure of section 9.7.1 on page 154.
This is the actual refracted angle (Beta) for this particular transducer and wedge
in steel.
4.
If this refracted angle value (Beta) differs from the value entered previously, press
[ANGLE]
, and then enter the corrected angle.
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Содержание EPOCH 1000 Series
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