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Distance-amplitude correction (DAC)
5 Operation
USM 36
Issue 2 (12/2013)
5-93
5.18 Distance-amplitude correction
(DAC)
The USM 36 has an optional DAC function for the echo
evaluation by means of the distance-amplitude correc-
tion (DAC).
Due to the angle of beam spread and the sound attenu-
ation in the material, the echo height of equally sized re-
flectors depends on the distance to the probe.
A distance-amplitude correction curve, recorded using
defined reference reflectors, is a graphical representa-
tion of these influencing factors.
If you use a reference block having artificial flaws to re-
cord a DAC curve, you can use this echo amplitude for
the evaluation of a flaw without any further corrections.
The reference block should be made of the same mate-
rial as the test object.
The time-corrected gain TCG increases the gain in dis-
tance sensitive mode so that all reference echoes reach
80 % screen height. The amplitude evaluation of echo
indications is made in relation to the first reference echo.
– Switch to the second operating level.
– Select the function group
EVAL
.
– Select the function
EVAL MODE
and choose
DAC/TCG
.
– Switch back to the first operating level. The function
group
DAC/TCG
is now displayed there.
If a stored DAC curve exists, it becomes effective now.
Содержание 37 400
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Страница 21: ...USM 36 Issue 2 12 2013 1 1 Introduction 1 ...
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Страница 279: ...USM 36 Issue 2 12 2013 10 1 Specifications 10 ...
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