Checkline DFX-7 - Manual (Page 44)

Dakota Ultrasonics
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Setting Polarity
1) Use the UP and DOWN arrow keys to scroll through the sub menu items
until POLARITY1 is highlighted.
2) Press the LEFT and RIGHT arrow keys to toggle the polarity POSITIVE.
3) Press the MEAS key to return to the measurement screen and get started
with the two point calibration.
5.2 Straight Beam Calibration
Now that the DFX-7 is setup with a valid range and a gate enabled, we’re ready to
perform a two point, calibration using a single element contact style transducer, as
follows:
Two Point Calibration – Straight Beam
Note: Calibration standards representing the minimum and maximum
thickness of the overall inspection range intended are required. They must also
be of the same material type as the intended application. For our example,
we’ll be using a 1 and 4 inch standard for calibration.