Probe Zero Offset - GE DMS Go+ Operating Manual

Carrying out the calibration

Probe zero offset

You can choose between automatic and manual probe
zero offset.
N o t e
The probe zero offset is not possible if the
option 2-PT is chosen for the function THK
CAL. In this case, the function ZERO is not
visible.
You have a choice between the following methods:
AUTO
This method determines the probe zero offset automat-
ically while the probe is coupled to the material to be
tested.
This method requires good coupling conditions and mul-
tiple data acquisitions for determining the ultrasonic
time of flight. Since this method performs zeroing every
time a measurement is taken, the zero offset is continu-
ously adjusted to temperature changes and delay lines.
DMS Go+
MANUAL
This method uses the reference block at the instrument
rear with known wall thickness and sound velocity in or-
der to determine the zero offset for the connected probe.
The method is applicable to both single-element probes
and dual-element probes and it even works in critical
coupling conditions or with rough surfaces.
USER
When using a clean, uncoupled probe, this method de-
termines the probe zero offset automatically before cou-
pling and only performs zeroing on user request.
This method works even in critical coupling conditions
and with rough surfaces.
Edition 4 (05/2014)
5 Operation
5-25