Krautkramer USN 52R/USN 52L Option DGS Issue 02, 03/99 DGS-23
Example:
If the surface of the test object is greatly corroded and
the reference echo originates from a smooth surface
reference block, then the sensitivity is reduced (e.g. by
8 dB). Correspondingly, the value for the transfer
correction must be entered negative, e.g.
T-CORRECTION = -8 dB.
This method is different from the usual way. Normally,
transfer loss is the value by which the gain must be
increased in order to compensate for the sensitivity
loss caused by a rougher surface.
You have now made all basic adjustments and are able
to carry out a DGS evaluation.
3.3 Carrying out a DGSevaluation
When carrying out a DGS evaluation, you compare the
reflecting power of a natural reflector with that of a disk-
shaped reflector. You are not making any flaw size esti-
mation.
–Make the basic adjustments for a DGS evaluation.
–Specify the reflector type and size.
–Switch to A-scan display: F
–Couple the probe and the reference block, and peak
the reference echo.
–Tag the function group DGS: I
–Adjust the required amplitude height of the reference
echo in the GAIN function: N or O
–Set the gate to the reference echo.
Carrying out a DGS evaluation Operating the DGS
Krautkramer USN 52R/USN 52L Option DGS Issue 02, 03/99 DGS-23
Example:
If the surface of the test object is greatly corroded and
the reference echo originates from a smooth surface
reference block, then the sensitivity is reduced (e.g. by
8 dB). Correspondingly, the value for the transfer
correction must be entered negative, e.g.
T-CORRECTION = -8 dB.
This method is different from the usual way. Normally,
transfer loss is the value by which the gain must be
increased in order to compensate for the sensitivity
loss caused by a rougher surface.
You have now made all basic adjustments and are able
to carry out a DGS evaluation.
3.3 Carrying out a DGSevaluation
When carrying out a DGS evaluation, you compare the
reflecting power of a natural reflector with that of a disk-
shaped reflector. You are not making any flaw size esti-
mation.
–Make the basic adjustments for a DGS evaluation.
–Specify the reflector type and size.
–Switch to A-scan display: F
–Couple the probe and the reference block, and peak
the reference echo.
–Tag the function group DGS: I
–Adjust the required amplitude height of the reference
echo in the GAIN function: N or O
–Set the gate to the reference echo.
Carrying out a DGS evaluation Operating the DGS