KERN & SOHN TN 300-0.01US - Manual (Page 6)

Sauter GmbH
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D-72336 Balingen
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Internet: www. sauter.eu
Instruction Manual
TN_US
TN_US-BA-e-1112 6
serves to “couple” or transfer the ultrasonic sound waves
from the transducer, into the material and back again.
Therefore a small amount of couplant should be applied
onto the surface of the material, before measurements are
performed. Typically, a single droplet is sufficient.
After the couplant is applied, the transducer has to be
pressed firmly against the area being measured. The
coupling status indicator should appear on the display as
well as a digit number. If the instrument has been “zeroed”
properly and if it has been set to the correct sound velocity,
the actual thickness of the material directly beneath the
transducer will be indicated as a number in the display.
If the coupling status indicator doesn’t appear or if it isn’t
stable or if the numbers on the display doesn’t seem to be
correct, it has to be checked whether there is an adequate
film of couplant beneath the transducer and whether the
transducer is placed flat onto the material.
If conditions persist, sometimes it is necessary to select a
different transducer (size or frequency) for the material
intended to be measured.
While the transducer is in contact with the material, the
instrument will perform four measurements every second,
updating its display as it does so.
If the transducer is removed, the display will hold the last
measurement performed.
Note: Occasionally a small film of couplant will be drawn
out between the transducer and the surface, as the
transducer is removed. If this happens, the instrument may
perform a measurement through this couplant film,
resulting in an erroneously measurement. This is
comprehensible because one thickness value is observed
while the transducer is in place and the other value is
observed after the transducer is removed.
In addition, measurements performed through very thick
paint or coatings may result in the paint or coating being
measured rather than the material intended.
The responsibility for a proper use of the instrument, as
well as the recognition of these types of phenomenon
solely depend on the user of this instrument.
4.4.1 Change of measuring sound velocity
In appendix A you find the different sound velocities, that
are to be applied for measuring the different materials.
To change the sound velocity of your instrument please
proceed as follows:
1. Press the CAL key twice until M/S symbol
begins to flash.
2. Then, press the SCAN or ALARM key to change
the sound velocity
3. To safe the settings, please press the Cal key.
4.5 Scan mode
While the instrument excels in making single point
measurements, it is sometimes necessary to examine a
larger region, searching for the thinnest point. This
instrument includes a feature, called SCAN- Mode, which
allows to do just that.
During normal operation, it performs and displays four
measurements every second which is adequate for single
measurements. In SCAN- Mode, however, the instrument
performs ten measurements every second and displays
the readings while scanning. While the transducer is in
contact with the material to be measured, it is always
keeping track to finding the lowest measurements. The
transducer may be “scrubbed” across the surface, any
brief interruptions of the signal will be ignored. If it looses
contact with the surface for more than two seconds, the
instrument will display the smallest measurement it found.
If the SCAN- Mode is turned off, Single point Mode will be
automatically turned on. The SCAN- Mode is turned on/ off
by the following steps:
The key has to be pressed to switch on/ off the SCAN-
Mode. The current condition of it will be displayed on the
display.
4.6 Changing resolution
The instrument TN xx-0.01 US has got a selectable display
resolution, which is 0.1 and 0.01mm.
If the key is pressed while turning on the instrument,
The resolution will be switched between “high” and “low”.
This function is not available for TN xx-0.1 US,
which is fixed to 0.1mm.
4.7 Changing units
On the measurement mode, the key has to be pressed
to switch back and forth between imperial and metric units.
4.8 Memory management
4.8.1 Storing a reading
There are 20 files (F00-F19) which can be used to store
the measurement values inside the instrument.
At most 100 records (thickness values) can be stored in
each file. The measured thickness value will be saved to
the current file by pressing the key after a new
measurement reading appears. It will be added as the
largest record of the file.
To change the destination file to store the measured
values, the following steps are to be carried out:
1) The key is to be pressed to activate the data logging
functions. The current file name and the total record
. count of the file will be displayed.
2) The key and the key have to be used to select
the desired file to set as current file.
3) The key has to be pressed to exit the data logging
functions any time as wanted.