Olympus EPOCH 650 User Manual page 256

DMTA-10055-01EN, Rev. A, February 2015
Used for angle beam inspections only. This is the length of the transducer
wedge from the BIP to the front of the wedge, and is used to remove the
wedge length from the surface distance measurements.
You must be aware of when it is necessary to apply values to ACV Specimen and
ACV Cal Block. These values affect the shape of the DGS/AVG curve and,
therefore, affect the accuracy of defect sizing. A suggested method for the
measurement of relative attenuation can be found later in this manual.
2. Once you have completed the selections in the DGS/AVG setup page, press
return the live A-scan display.
To complete the DGS/AVG curve setup
1. Couple the transducer to the calibration block and obtain a reflection from the
selected reference-reflector.
2. Press GATES to gate the reference indication.
3. Press 2 ND F, (AUTO XX%) to bring the reference-reflector to 80 % FSH.
4. Press DGS/AVG > Ref to capture the reference-reflector and build the DGS/AVG
curve.
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