GE Krautkramer USM 35X - Echo Evaluation with DAC; OFFSET (Distance of Multiple DAC)

Krautkramer USM 35X Issue 01, 04/2005 5-65
Operation
OFFSET (Distance of multiple DAC)
You can activate a multiple DAC and at the same time
determine the distance from the registration curve. The
default setting 6.0 dB generates four other curves at
–12 dB, –6 dB, +6 dB, and +12 dB from the registration
curve. The setting 0 generates only the registration
curve. Any setting different from 0 generates four other
curves at a set distance from the original curve. For a
better distinction in multiple DACs the registration curve
is displayed as a bold line.
Adjustment range: 0 dB ... 14 dB in steps of 0.5 dB
– Select the function OFFSET.
– Use the right-hand rotary knob to select the required
setting.
Distance-amplitude curve (only USM 35X DAC and USM 35S)
Echo evaluation with DAC
In order to be able to evaluate a flaw indication by
means of the DAC, certain conditions must be met:
• The distance-amplitude curve must already be
recorded.
• It only applies to the same probe that was used
when recording the curve. Not even another probe of
the same type must be used!
• The DAC only apply to the material corresponding to
the material of the reference block.
• All functions affecting the echo amplitude must be
set the same way as they were when the curve was
recorded. This applies in particular to the following
functions: POWER, FREQU, RECTIFY, MTLVEL and
REJECT.
Krautkramer USM 35X Issue 01, 04/2005 5-65
Operation
OFFSET (Distance of multiple DAC)
You can activate a multiple DAC and at the same time
determine the distance from the registration curve. The
default setting 6.0 dB generates four other curves at
–12 dB, –6 dB, +6 dB, and +12 dB from the registration
curve. The setting 0 generates only the registration
curve. Any setting different from 0 generates four other
curves at a set distance from the original curve. For a
better distinction in multiple DACs the registration curve
is displayed as a bold line.
Adjustment range: 0 dB ... 14 dB in steps of 0.5 dB
– Select the function OFFSET.
– Use the right-hand rotary knob to select the required
setting.
Distance-amplitude curve (only USM 35X DAC and USM 35S)
Echo evaluation with DAC
In order to be able to evaluate a flaw indication by
means of the DAC, certain conditions must be met:
• The distance-amplitude curve must already be
recorded.
• It only applies to the same probe that was used
when recording the curve. Not even another probe of
the same type must be used!
• The DAC only apply to the material corresponding to
the material of the reference block.
• All functions affecting the echo amplitude must be
set the same way as they were when the curve was
recorded. This applies in particular to the following
functions: POWER, FREQU, RECTIFY, MTLVEL and
REJECT.