Checkline DFX-7 - Manual (Page 17)

DFX-7
Ultrasonic Flaw Detector
13
4) Press the ENTER key to display the Digits Edit Box.
5) Press the UP and DOWN arrow keys to scroll the highlighted value.
6) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
7) Repeat steps 5 & 6 until the known thickness value is correctly displayed.
8) Press the OK key to calculate the velocity and return to the menu screen, or
ESC to cancel the one point calibration.
9) Finally, press the MEAS key to return to the measurement screen and begin
taking readings.
Note: CHECK YOUR CALIBRATION! Place the transducer back on the
calibration point. The thickness reading should now match the known
thickness. If the thickness is not correct, repeat the steps above.
2.5 Zero Coating
In order to account for very slight electronic differences in transducers of the same
type, frequency, and diameter, the DFX-7 has been equipped with a “zero coating”
feature. This enables the DFX-7 to obtain very accurate readings on coatings,
eliminating potential errors incurred from slight differences in the manufacturing
processes. The procedure is outlined below: