Checkline DFX-7 - Manual (Page 58)

Dakota Ultrasonics
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6) Press the OK key to set the X-OFFSET and return to the menu screen, or
ESC to cancel entering the X-OFFSET.
Note: The X-Offset is used for purposes of marking, and is physically
measured with a ruler from the index point to the front edge of the transducer.
Curved Surface Outside Diameter
1) Press the UP and DOWN arrow keys until CSC OD is highlighted, followed
by pressing the LEFT and RIGHT arrow keys to scroll the value. When the
correct CSC OD is displayed, proceed to the next setting.
2) Alternatively, press the ENTER key to display the Digits Edit Box.
3) Press the UP and DOWN arrow keys to scroll the highlighted value.
4) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
5) Repeat steps 3 & 4 until the CSC OD is correctly displayed.
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.