Dakota Ultrasonics DFX-8 plus MANUAL1 - Manual (Page 63)

DFX-8 Series Ultrasonic Flaw Detectors
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6) Press the OK key to set the CSC OD and return to the menu screen, or ESC
to cancel entering the CSC OD.
Note: The CSC OD value is only used for curved surfaces of longitudinally
welded pipes.