Dakota Ultrasonics MMX-6 User Manual

Page 19

MMX-6 Ultrasonic Thickness Gauge

display should show some (probably incorrect) thickness value,

and the Stability Indicator should have nearly all its bars on.

5) Having achieved a stable reading, remove the transducer. If the

displayed thickness changes from the value shown while the

transducer was coupled, repeat step 4.

6) Press the CAL key. The IN (or MM) symbol should begin flashing.

7) Use the UP and DOWN arrow keys to adjust the displayed

thickness up or down, until it matches the thickness of the sample

piece.

8) Press the CAL key again. The IN/

µs (or M/s) symbols should

begin flashing. The MMX-6 is now displaying the sound velocity

value it has calculated based on the thickness value that was

entered in step 7.

9) Press the CAL key once more to exit the calibration mode. The

MMX-6 is now ready to perform measurements.

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 MMX-6 is on and switched to P-E (pulse-echo)

mode. Press the Dual-Multi key to toggle modes.