Calibration Of The Sound Velocity - sauter TO-EE Instruction Manual

4. Press the transducer against the probe plate and make sure that the transducer
is flat against the surface.
5. When the progress bar is complete, remove the transducer from the probe plate.
Repeat this procedure four times if necessary.
6. At this point the internal error factor is successfully calculated by the instrument
and compensated for in all subsequent measurements. When performing the
"Probe Zero" function, the instrument always uses the sound velocity value of
the built-in probe plate, even if a different velocity value was entered for the
actual measurements. Although the instrument remembers the last zero setting,
it is generally advisable to perform the "Probe Zero" function when the
instrument is turned on and when using another transducer. This will ensure
that the instrument is always zeroed correctly.
In Probe Zero mode, press to exit the Zero function and return to the measuring
mode.

5.4 Calibration of the sound velocity

In order for the measuring instrument to perform accurate measurements, it must be
set to the correct sound velocity for the material to be measured. Different types of
material have different inherent velocities. If the gauge is not set to the correct speed
of sound, all measurements made with the gauge will have a certain percentage of
error. Single point calibration is the simplest and most commonly used calibration
method that optimizes linearity over large ranges. Two-point calibration allows
greater accuracy in small ranges by calculating the zero point of the probe and the
velocity.
14 TO-BA-e-2020