Dakota Ultrasonics MMX-6DL User Manual

Page 21

MMX-6 DL Ultrasonic Thickness Gauge

Calibration to a known thickness

Note: This procedure requires a sample piece of the specific material

to be measured, the exact thickness of which is known, e.g. from

having been measured by some other means.

1) 1) Make sure the MMX-6 DL is on and switched to P-E (pulse-

echo) mode. Press the Dual-Multi key 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-E mode, “nO” followed

by “CAL” will be displayed.

2) Perform a Probe-Zero (refer to page 14)

3) Apply couplant to the sample piece.

4) Press the transducer against the sample piece, making sure that

the transducer sits flat against the surface of the sample. The

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 DL is now displaying the sound