Phantom Echo Detector - GE USM 36 Series Technical Reference And Operating Manual

Configuring the USM 36 for test tasks

Phantom echo detector

You can use the function PHANTOM PRF to turn on the
phantom echo detector of the USM 36. When the func-
tion is turned on, phantom echoes become visible due
to a regular movement sideways.
Especially when inspecting forgings, it is recommended
to leave the phantom echo detector turned on perma-
nently in order to detect phantom echoes.
USM 36
As long as no phantom echoes occur, no distinction can
be made in the echo representation between the set-
tings ON and OFF.
As soon as the phantom echoes appear in the setting
ON, they can be recognized at once by a regular move-
ment back and forth (approx. 3/s). If this is the case,
vary the pulse repetition frequency until the phantom
echoes disappear or have at least become sufficiently
small.
N o t e
It is recommended to always leave the phan-
tom echo detector turned on. In this way,
problems are recognized at once.
– Switch to the second operating level.
– Select the function group CONFIG2.
– Select the function PHANTOM PRF and press one of
the selector keys to turn on the phantom echo detec-
tor.
Issue 2 (12/2013)
5 Operation
5-57