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Dakota Ultrasonics
8.4 Auto - Zero/Calibration
The auto calibration feature uses a single steel calibration bar and two
measurements, the second at twice the length (i.e. 3" bar at 3" & 6"). This zero
option will typically be most preferred, as it's fully automated and simple to
use. However, depending on signal quality and the material type of calibration
standard, it may not always work (not recommended for use with our triple path glass
block). If valid signals cannot be acquired during the 'auto set' routine, the MAX II
will report "can't find stable echo". Before eliminating this option altogether and using
one of the manual options listed below, try relocating the transducer to various
positions on the end of the calibration standard first. Since the calibration standards
are cylindrical, they can sometimes create substantial sidewall noise based on
length, transducer size, and frequency. Moving the transducer to the edge of the
cylinder will often times eliminate the noise by shooting down the edge of the
standard and allowing the MAX II to acquire a stable echo.
We're ready to get started with the automatic zero/calibration process. The first thing
to note is the procedures in this section demonstrate an automatic 'two-point'
calibration using a 3" Cal Bar that's fast and efficient, requiring minimal adjustments
from the operator.
Note: The temperature sensor should be connected to the gauge with the Temp
Mode set to 'auto', located in the utility menu, then placed on the serial # flat of the
Cal Bar. This will compensate for temperature shifts and avoid measurement errors.
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