Dakota Digital MMX-6 operation manual Calibration to a known velocity

MMX-6 DL Ultrasonic Thickness Gauge

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 DL is on and switched to P-E(pulse-echo) mode. Press the Dual-Multikey to toggle modes.

Note: The calibration function has been disabled in E-E(echo-echo) mode. If the CAL key is pressed while in E-Emode, “nO” followed by “CAL” will be displayed.

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 MMX-6 DL 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-0key 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 MMX-6 DL to a sample piece of known thickness. Material composition (and thus, its sound-velocity) sometimes

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