GE USM 36 Series Technical Reference And Operating Manual page 198

5 Operation
The following parameters of the probe affect the curve
shape:
● element or crystal diameter,
● frequency,
● length of delay line,
● delay velocity.
5-122
You can adjust these parameters in the USM 36 in such
a way that you can use the DGS method with many dif-
ferent probes and on various materials.
N o t e
Before setting up the DGS mode, the instru-
ment has to be calibrated at first since none
of the functions affecting the DGS evaluation
(VELOCITY, PROBE DELAY, VOLTAGE,
ENERGY, DAMPING, FREQUENCY, REC-
TIFY), can be changed any more after re-
cording the reference echo.
For dual-element probes, the sound velocity can only be
set between 5350 and 6500 m/s.
For more information on this subject, please refer to
Chapter 5.8 Calibrating the USM 36, page 5-28.
Issue 2 (12/2013)
Evaluation according to the DGS method
USM 36