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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/µ s (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.
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.
1.800.544.2843
Calibration to a known velocity
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30
MMX-6 Ultrasonic Thickness Gauge
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