Calibration To A Known Velocity - DAKOTA ULTRASONICS DX-2 Operation Manual

Dakota Ultrasonics
NOTE: This procedure requires that the operator know the sound-
velocity of the material to be measured. A table of common
materials and their sound-velocities can be found in Appendix C.
1) Make sure the DX-2 is on.
2) Press the CAL key to enter calibration mode. If the IN (or MM)
symbol is flashing, press the CAL key again, so that the IN/µs (or
M/s) symbols are flashing.
3) Use the UP and DOWN arrow keys to adjust the displayed velocity
up or down, until it matches the sound-velocity of the material to be
measured.
4) Press the CAL key once more to exit the calibration mode. The
DX-2 is now ready to perform measurements.
NOTE: At any time during the calibration procedure (IN, MM, IN/µ s, or
M/s flashing in the display), pressing the PRB-0 key will restore the tool to
the factory default sound-velocity for steel (0.233 IN/µs).
To achieve the most accurate measurements possible, it is generally
advisable to always calibrate the DX-2 to a sample piece of known
thickness. Material composition (and thus, its sound-velocity) sometimes
varies from lot to lot and from manufacturer to manufacturer. Calibration to
a sample of known thickness will ensure that the tool is set as closely as
possible to the sound velocity of the material to be measured.
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Calibration to a known velocity