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Ultrasonic tester UK1401
Operation Manual
31
ACOUSTIC
CONTROL
SYSTEMS
2.3.2 TIME / VELOCITY Modes
In the TIME / VELOCITY modes the screen is divided into two areas: the upper one displays the information on measurement,
the lower displays the information on the results already recorded in the TIME / VELOCITY modes (groups, group cells and
measurement results in µs or m/s depending on the selected operation mode) (Figure 32).
Place the instrument on the inspected object with both ultrasonic transducers, trying to position it so that the transducers
are perpendicular to the surface of the object. Immediately after the transducers touch the surface of the object being inspected,
the instrument switches from the standby mode (seldom sending of the sounding pulses) into the active state (often sending
of the sounding pulses).
If the sound indication is On, the measurements are accompanied by short sound signals. If sound signals are missing, it
indicates that the instrument is not in the active state. I.e. either the ultrasonic
velocity in the material of the inspected object is below the minimum permis-
sible value, or there is a crack in the area between the transducers that prevent
the ultrasonic signal from passing to the receiving transducer.
After the measurements are completed and the instrument is removed
from the inspected object, the measurement result will remain on the screen
for 10 to 15 seconds, after that it will change into horizontal strokes.
While measuring try to hold the instrument motionless if possible.
If the measurement results in the same place of inspection substantially
differ, decrease the repetition frequency of the sounding pulses. To do that, se-
lect the FREQUENCY option in the SETUP mode and decrease its value. Repeat
the measurements in the same place of the inspected object.
Active keys:
/ – holding – navigating the columns of the group – CELL –
RESULT in corresponding direction;
/ – short pressing – navigating the lines of the active col-
umn in corresponding direction.
2
Figure 32