910-269-EN, Rev. B, June 2011
282 Chapter 17
17.3.2
Calibrating the Wedge Delay With a Zero Degree Transducer
Wedge delay can be calibrated using a discrete reflector, such as a side-drilled hole, or
a back-wall reflection. In the following example the first back wall of the IIW block is
used to calculate the wedge delay.
To calibrate the wedge delay with a zero degree transducer
1.
Press
[RANGE]
to enter an appropriate range for the calibration.
For this example, use 10 in. (254 mm).
2.
Select
1/5 > PA CAL > CAL Mode =
CAL Zero
.
3.
Press
[ANGLE]
, and then adjust the selected focal law (angle) to 0°.
4.
Couple the transducer to the side of the block.
5.
Use the
[GATE]
key to position gate 1 to surround only the first back-wall echo
from the block.
6.
Adjust the gain so that the echo amplitude is at approximately 80 %.
Figure 17-5 Example of gated calibration signal
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Summary of Contents for EPOCH 1000 Series
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