Dakota Ultrasonics MX-5 User Manual

Page 20

Dakota Ultrasonics

Calibration to a known velocity

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 M X-5 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

MX-5 is now ready to perform measurements.

NOTE: At any time during the calibration procedure (IN, MM, IN/

µs, or

M/s flashing in the display), pressing the PRB-0 key will restore the gauge

to the factory default sound-velocity for steel (0.233 IN/

s).

To achieve the most accurate measurements possible, it is generally

advisable to always calibrate the MX-5 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 gauge is set as closely as

possible to the sound velocity of the material to be measured.