Checkline DFX-7 - Manual (Page 50)

Dakota Ultrasonics
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Note: CHECK YOUR CALIBRATION! Place the transducer back on the one
inch point, and any others in the given range, to confirm linearity. If the velocity
and zero values we calculated correctly, the thickness reading will match the
known thickness of the calibration standards. If the thickness is not correct,
repeat the steps above.
5) Press the OK key once to display the thickness, or the MEAS key to return
to the hot menus at any time.
5.3 Angle Beam Calibration
In the first example we demonstrated how to perform a two point calibration using a
single element straight beam contact transducer. With the exception of a handful of
additional comments, calibration using an angle beam transducer is virtually identical
in the scope of the overall step by step process. To avoid copying the procedures
from the previous section, we’ll focus only on the additional comments. Refer to
section 5.1 and 5.2, regarding the procedures to setup and calibrate the DFX-7. The
following are a list of additional items to consider when using an angle beam
transducer, as follows:
Calibration Standards:
There are a number of calibration block options available in a variety of common
material types, and according to specific code requirements. The user should
consider the application, codes applicable, and purchase the necessary calibration
standards.