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Dakota Ultrasonics
point calibration is the simplest and most commonly used calibration
procedure - optimizing linearity over large ranges. The two point
calibration allows for greater accuracy over small ranges by calculating the
probe zero and velocity. The MMX-6 provides three simple methods for
setting the sound-velocity, described in the following pages.
Note: Although the MMX-6 has a thru-paint/coating feature, one and two
point calibrations must be performed on material with the paint or coating
removed. Failure to remove the paint or coating prior to calibration, will
result in a multi material velocity calculation that may be different from the
actual material velocity intended to be measured.
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) Make sure the MMX-6 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 12)
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
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Calibration to a known thickness
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