Olympus EPOCH 6LT, User Interface Manual

Page: 185 / 232

DMTA-10084-01EN, Rev. 2, November 2018
Software Features and Options 175
For angle beam probes, the available reflectors are as follows:
○
Side-drilled hole (SDH)
○
K1-IIW block arc
○
K2-DSC block
○
Flat-bottom hole (FBH)
— Refl. Dia.
Used for angle beam inspections only. This allows you to define the diameter
of the flat-bottom hole (FBH) or side-drilled hole (SDH) used as a reference
reflector. This size is required to properly position the DGS/AVG curve.
— DeltaVT
Transfer correction value used to compensate for amplitude differences as a
result of coupling variation (surface condition) from the calibration block to
the test piece. EN 583-2:2001 provides methods for calculating transfer
correction.
— Reg. Level
The height of the main DGS/AVG curve. The curve represents the amplitude
from a flat-bottom hole with a diameter of the registration level at different
depths. This is usually equal to the critical flaw size for the application.
— Warning 1, 2, 3
These are the positions of up to three secondary DGS/AVG “warning” curves
compared to the position of the main DGS/AVG curve. If any of these values
is set to zero, the warning curve is turned off.
— ACV Spec
This is the attenuation value in dB/m for the test piece (specimen). In some
cases, it is necessary to calculate the relative attenuation within the test piece
and enter the value here.
— ACV Cal
This is the attenuation value in dB/m for the calibration block. In some cases,
it is necessary to calculate the relative attenuation within the calibration block
and enter the value here.
5. When you have completed the selections in the DGS/AVG dialog box, press the
Shift, Tab key sequence to display the
DGS/AVG submenu on 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.