Dakota Ultrasonics MMX-6DL - Manual (Page 8)

Dakota Ultrasonics
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The PRB-0 key is used to "zero" the MMX-6 DL in much the same way
that a mechanical micrometer is zeroed. If the tool is not zeroed correctly,
all of the measurements that the tool makes may be in error by some fixed
value. Refer to page 14 for an explanation of this important procedure.
The CAL key is used to enter and exit the MMX-6 DL's calibration
mode. This mode is used to adjust the sound-velocity value that the MMX-
6 DL will use when calculating thickness. The tool will either calculate the
sound-velocity from a sample of the material being measured, or allow a
known velocity value to be entered directly. Refer to page 15 for an
explanation of the two CAL functions available.
The MODE key is used to toggle through the various features and
settings of the MMX-6 DL (gate, alarm mode, beeper, back light, units,
scan mode, and differential mode ). The MODE key is used in conjunction
with the arrow and send keys to enable/disable the features and settings.