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Krautkramer USN 52R/USN 52L Option DGS Issue 02, 03/99 DGS-21
For the reference echo you need a test block with a
known reflector. This reflector can be one of the follow-
ing types:
• backwall
• disk-shaped reflector
• side-drilled hole. With known diameter of the side-
drilled hole, the diameter of a corresponding disk-
shaped reflector can be calculated, provided that the
following requirements are met:
D
SDH
³ 1,5 l
s ³ 1,5 N
with D
SDH
: diameter of side-drilled hole
s: sound path in the test object
l: wavelength in the test material
N: near-field length of the probe used
in the test material
D
ESR
: diameter of the equivalent
disk-shaped reflector
D
ESR
=
Operation
H Note:
Before measuring, use M to select the setting PEAK
in MEASURE. In addition, activate the gate.
– Connect the required probe to the USN 52 R and
select a suitable reference block for receiving the
reference echo.
– Adjust the A-scan and digital display (please refer to
USN 52R/USN 52L Operating Manual, Chapter 5).
A Attention:
Proper A-scan and digital calibration will
assure that the MTL VEL and ZERO parameters are set
correctly, which is necessary for an accurage DGS
curve.
– Switch to the second operation level: X
– Tag the function table DGS: T or V
– Tag the left column of the DGS function group using
J or C.
– Select the required probe number.
Ö2
Ö
p
lÖsD
SDH
Preparing the DGS evaluation
Operating the DGS
Krautkramer USN 52R/USN 52L Option DGS Issue 02, 03/99 DGS-21
For the reference echo you need a test block with a
known reflector. This reflector can be one of the follow-
ing types:
• backwall
• disk-shaped reflector
• side-drilled hole. With known diameter of the side-
drilled hole, the diameter of a corresponding disk-
shaped reflector can be calculated, provided that the
following requirements are met:
D
SDH
³ 1,5 l
s ³ 1,5 N
with D
SDH
: diameter of side-drilled hole
s: sound path in the test object
l: wavelength in the test material
N: near-field length of the probe used
in the test material
D
ESR
: diameter of the equivalent
disk-shaped reflector
D
ESR
=
Operation
H Note:
Before measuring, use M to select the setting PEAK
in MEASURE. In addition, activate the gate.
– Connect the required probe to the USN 52 R and
select a suitable reference block for receiving the
reference echo.
– Adjust the A-scan and digital display (please refer to
USN 52R/USN 52L Operating Manual, Chapter 5).
A Attention:
Proper A-scan and digital calibration will
assure that the MTL VEL and ZERO parameters are set
correctly, which is necessary for an accurage DGS
curve.
– Switch to the second operation level: X
– Tag the function table DGS: T or V
– Tag the left column of the DGS function group using
J or C.
– Select the required probe number.
Ö2
Ö
p
lÖsD
SDH
Preparing the DGS evaluation
Operating the DGS