Dakota Ultrasonics MMX-6 User Manual

Page 20

Dakota Ultrasonics

Note: The calibration function has been disabled in E-E (echo-echo)

mode. If the CAL key is pressed while in E-E mode, “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 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 MMX-6 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.