Dakota Ultrasonics MINI--MAX - Manual (Page 122)

Dakota Ultrasonics
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2) Use the UP and DOWN arrow keys to scroll through the sub menu items
until LOAD CAL MODE is highlighted.
3) Press the LEFT and RIGHT arrow keys to scroll through the unit options
OFF, VECTOR (zero offset), REGRESSION, until the correct mode is
displayed.
4) Press the MEAS key to return to the measurement mode.
Now that a group has been created and activated, and the load calibration mode
selected, we’re ready to perform the field calibration.
Performing a Field Calibration
1) Place the first sample bolt in the load apparatus.
Note: The following steps assume that the user has previously selected a
similar material type for the list of materials and the approximate length of
the bolt has been entered. Therefore, the MINI-MAX is currently setup and
ready to measure in elongation mode.
2) Apply a drop of couplant to the bolt or transducer, and attach it to one
end of the bolt. Rotate the transducer clockwise and counter clockwise
applying a small amount of pressure to eliminate any excess couplant
between the transducer and bolt. Be sure to always place the
transducer in the same location. This will help to eliminate any potential
measurement errors cause by changing the sound path.
3) Record the ultrasonic reference length at zero Load by pressing the
ENTER key.
Note: The reference lengths must be saved in column A in the group.