Deleting The Dac Curve; Echo Evaluation Using Dac - GE USM 36 Series Technical Reference And Operating Manual

Distance-amplitude curve according to JB/T4730 and GB 11345 (CNDAC)

Deleting the DAC curve

You can delete the DAC curve at any time. After this, the
CNDAC evaluation is not possible until you have record-
ed a new DAC curve.
– Switch to the first operating level.
– Select the function group CNDAC.
– Press one of the selector keys to display the specific
function groups and functions for the CNDAC.
– Select the function group SETUP.
– Select the function DELETE CURVE and
press one of the selector keys. A message prompting
you to confirm is displayed.
– Press one of the selector keys for 3 seconds to con-
firm the deletion of the reference echo. The deletion
is acknowledged by the indication (NO CURVE).
USM 36

Echo evaluation using DAC

To be able to evaluate a flaw echo by means of the
DAC, certain conditions must be met:
● The distance-amplitude correction curve has to be re-
corded beforehand.
● It only applies to the same probe that was used for re-
cording the curve. It is not allowed to use even anoth-
er probe of the same type!
● The curve only applies to the material corresponding
to the material of the reference block.
● All functions affecting the echo amplitude must be set
in the same way as they existed during the recording
of the curve. This applies especially to the parame-
ters voltage, frequency, rectification, material veloci-
ty, and reject.
Issue 2 (12/2013)
5 Operation
5-119