KERN & SOHN TU 300-0.01US - Manual (Page 3)

Sauter GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected] Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Instruction Manual
TU_US
TU_US-BA-e-1212 3
2.3 Measurement screen
Battery Information:
Displays the information of the rest capacity of battery
Coupling status:
Indicates the coupling status. While measurements are
performed, this symbol should be on. If it isn’t, the
instrument is having difficulties in achieving a stable
measurement and the thickness value displayed will most
likely be erroneous.
Operating hint: Shows hints of current operation
FIL: File selection
MEM: Memory data viewing
PRB: Transducer set
VEL: Change velocity
CAL: Velocity calibration
DPC: Dual point calibration state
ZER: Probe zero state
SCA: Indicates that the current thickness measurement
Mode is Scan mode, not Single point mode.
File name: current file name is shown
Record No./ Count: The current record number is indicated
while this item is highlighted or the total record counts
while it isn’t highlighted.
Transducer Model: Current transducer model setting in the
instrument
Sound velocity: Current sound velocity setting
Thickness reading: The present Single time measured
value is displayed.
↑ means that the upper measuring limit
is exceeded. ↓ means that the value is lower than bottom
measuring limit.
Units label: If the mm symbol is on, the instrument is
displaying the thickness value in millimetres and the sound
velocity in m/s.
If the in symbol is on, the instrument is displaying the
thickness value in inches and the sound velocity in
inch/us.
2.4 Keypad definitions
Turn the
instrument on
and off Exit from
current
selection
Turn on/off the
EL backlight Enter
Probe Zero
operation Plus or scroll
up
Switch selection
among items Minus or
scroll down
Data Save or
Data Delete
3. Preparation
3.1 Transducer Selection
With this instrument it is possible to measure a wide range
of different materials, started from various metals to glass
and plastics. These different types of material require the
usage of different transducers. Choosing the correct
transducer is the most important thing to perform accurate
and reliable measurements. Generally speaking, the best
transducer for an operation is the one that sends sufficient
ultrasonic energy into the material to be measured in the
way that a strong, stable echo is to be received in the
instrument. There are several factors that affect the
strength of the traveling ultrasound. They are described as
followed:
Initial signal strength: The stronger a signal is at the
beginning, the stronger its echo will return. Initial signal
strength is mainly a factor of the size of the ultrasound
emitter in the transducer. A large emitting area will send
more energy into the material being measured than a small
one. Thus, a so-called “1/2 inch” transducer will emit a
stronger signal than a “1/4 inch” transducer.
Absorption and scattering: As the ultrasound travels
through a material, it is partly absorbed. If the material has
got any grain structure, the sound waves will start
scattering. Both of these effects reduce the strength of the
waves and thus the instrument’s ability to detect the
returning echo. Ultrasound of higher frequency is absorbed
and scattered more than ultrasound of lower frequency.
While it may seem that using a lower frequency transducer
is better in every instance, it should be mentioned that low
frequencies are less directional than higher ones. Thus, a
higher frequency transducer is a better choice for detecting
the exact location of small pits or flaws in the material to be
measured.
Geometry of the transducer:
The physical constraints of the environment sometimes
determine a transducer’s suitability for an operation. Some
transducers are simply too large to be used in a confined
area. If the available surface area for contacting with the
transducer is limited, the usage of a transducer with a
small surface is required.
ThicknesReading
Units Label
Battery
Transducer
Model
Record
No./count
File Name
Coupling
Status
Operating Hint
Sound Velocity