Calibration With Straight-Beam And Angle-Beam Probes - GE USM 36 Series Technical Reference And Operating Manual

Calibrating the USM 36
Calibration with straight-beam and angle-
beam probes
Case A: With known material velocity
– Set the known material velocity (function group
RANGE).
– Couple the probe to the calibration block.
– Set the required display range using the function
RANGE. The calibration echo must be displayed on
the screen.
– Position the gate on one of the calibration echoes un-
til the sound path of the echo is indicated in the mea-
surement line.
– After this, adjust the setting of the function PROBE
DELAY until the correct sound path for the selected
calibration echo is indicated in the measurement line.
USM 36
Example
You are carrying out the calibration for the calibration
range 100 mm using the calibration standard K1 (thick-
ness 25 mm) which is laid down flat.
– Set RANGE to 100 mm.
– Set the known material velocity of 5920 m/s (please
see ISO 10863).
– Set the gate so that it is positioned on the first calibra-
tion echo (from 25 mm).
– Read the sound path in the measurement line. If this
value is not equal to 25 mm, adjust the setting of the
function PROBE DELAY until it is at 25 mm.
This completes the calibration of the USM 36 to the ma-
terial velocity of 5920 m/s with a calibration range of
100 mm for the probe used.
Issue 2 (12/2013)
5 Operation
5-29