Calibration To A Known Thickness; Calibration To A Known Velocity - sauter TU 80-0.01US Instruction Manual

Note: One- and Two-point calibrations should only be performed on material where
the paint or the coating is removed; if not, it will result in a multi material velocity cal-
culation which is surely deviating from the actual velocity of the material intended to be
measured.

5.4.1 Calibration to a known thickness

Note: This procedure requires a sample piece of the material which is going to be
measured, its exact material thickness, which has to been measured by any means
before.
1) A Zero adjustment has to be performed.
2) A couplant has to be applied to the sample piece.
3) The transducer has to be pressed against the sample piece, making sure that the
transducer is placed flat on it.
The display should show a thickness value and the coupling status indicator should
appear.
4) As soon as a stable reading has been achieved, the transducer has to be removed.
If the displayed thickness
Is different from the value shown while the transducer was coupled, step 3 has to be
repeated.
5)The and the
until the thickness of the sample piece is matched.
6) The key has to be pressed and the sound velocity value, which has been calcu-
lated before based on the thickness value that was entered, is displayed.
7) The key hast to be pressed to exit the calibration mode. Now, measurements can
be performed.

5.4.2 Calibration to a known velocity

This procedure requires that the sound velocity of the material being measured, is
known. A table of the most common materials and their sound velocities can be found
in Appendix A of this manual.
1. The key has to be pressed multiple times to tab to the sound velocity item.
2. The key has to be pressed to switch among the preset commonly used velocities.
The preset sound velocity value can be overwritten, if essential, up or down with the
keys and until the sound velocity of the material to be measured is matched. This
value may be above or below the preset sound velocity for a special material (see table
in Appendix A).
3. The key has to be pressed to exit from the calibration mode. The instrument is
now ready to perform measurements.
Another method to set the instrument with a known sound velocity is as follows:
1) The submenu item 【Test Set】－>【Velocity Set】has to be highlighted and the
key has to be pressed to enter the sound velocity set screen.
TU_US-BA-e-1714
key has to be used to adjust the displayed thickness up or down
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