Figure 9-18 The Iiw Block With Probe At The 45° Mark - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
Figure 9-18 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 use the Peak Memory feature 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 "Locating the Beam Index
Point" on page 165.
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, select
Trig > Angle, and then enter the corrected angle.
168 Chapter 9