Backwall Echo Attenuation (Bea) - GE USM 36 Series Technical Reference And Operating Manual

General setup

Backwall echo attenuation (BEA)

You can use the function BEA (Backwall Echo Attenu-
ation) to set a separate gain for the range of gate B. This
gain is independent of the gain for the rest of the test
range.
The backwall echo attenuation therefore enables a se-
lective attenuation or peaking of the echoes in the
gate B.
A typical application case for this is the testing of forg-
ings. In this application case, the gain is reduced in
gate B until the backwall echo is completely displayed in
USM 36
the A-scan. The backwall echo can then be selectively
integrated into the flaw evaluation.
However, the backwall echo attenuation also allows to
systematically increase the gain. In this way, you can,
for example, only increase the gain within the flaw ex-
pectancy range in order to peak the echo in this range.
– Switch to the second operating level.
– Select the function group CONFIG4.
– Select the function BEA and press one of the selector
keys to turn on the backwall echo attenuation.
– Switch to the function BW GAIN.
– Choose the required gain value.
Issue 2 (12/2013)
5 Operation
5-83