TB_US-BA-e-2020
7
8.
Measuring with adjustment of the ultrasonic speed
Attention: This chapter does not apply to devices of the TB 200-0.1USred series!
1. When the VEL- key 4-13 is pressed, the display shows the last stored sound
velocity.
2.
Coating thickness & material thickness measurement at known sound
velocity:
The speed of sound can be adjusted by pressing the plus or minus key. This
changes the value shown on the display up or down. The increase is initially
10m/s.
If the plus or minus key is pressed down for more than 4 seconds, the increase
is
100m/
sec.
each
time.
A little oil is applied to the material to be measured. Now the US measuring
head 4-7 is pressed onto the surface to be measured. On the display the
material thickness can now be read, provided that the coupling is good. If the
sound velocity of a certain material is known, it is easy to measure the material
thickness.
3.
Layer thickness & material thickness measurement at unknown sound
velocity:
Take
a
material
sample
with
known
material
thickness.
and adjust the speed of sound as described in 2. and 3. is repeated until the
measured value corresponds exactly to the known material thickness.
In this case, the fixed value is the sound velocity of the material to be measured.
Now any unknown material thickness of the same material can be measured.
4. To change the speed of sound, press the VEL button 4-13. To enter the
measuring mode, press this key again or wait until the instrument automatically
displays '0'.
5. With the help of ultrasonic measurement, the layer material thickness of any
hard, homogeneous material can be measured in the simplest way.
