910-269-EN, Rev. B, June 2011
Calibrating the EPOCH 1000 Series (Conventional UT Mode) 155
The peak memory is an excellent tool for finding the BIP. Press [PEAK MEM] to turn
peak memory on. This feature draws and collects the echo envelope of the signal
while also drawing the live waveform (see
Figure 9-13 on page 155). Match the live
waveform with the maximum point corresponding to the previously accumulated
echo dynamic curve. Press [PEAK MEM] again to turn peak memory off.
Figure 9-13 Using the peak memory to find the BIP
5. Hold the probe stationary once the signal is peaked up and mark the side of the
transducer wedge directly over the 0
mark on the block.
This is the BIP, the point at which the sound leaves the wedge and enters the
material with maximum energy.
9.7.2 Verifying the Refracted Angle
The expected refracted angle of the probe should already have been entered in the
EPOCH
1000 Series in the initial steps of the calibration procedure. Although the
wedge may be marked 45°, for example, the actual refracted angle could be slightly
different due to the properties of the test material or the amount of wear on the
wedge. It is necessary to verify the actual angle. This ensures that the EPOCH
1000
Series sound path calculations are accurate.
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