Checkline DFX-7 - Manual (Page 41)

DFX-7 Ultrasonic Flaw Detector
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2) 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 desired range value is displayed.
6) Press the OK key to set the value and return to the GT1 menu.
Note: Our range calibration range for this example is 4 inches. Therefore
setting a range of 5 inches will enable the user to view the entire range on the
display.
Enabling and Setting Up a Gate
Refer to the illustrations above. In order to measure, a gate is required. The
width of the gate should be small enough, in terms of its width, in order to select
specific reflections to measure. The screenshot above shows a gate enabled to
select the 1 inch calibration standard, and in the second the 4 inch calibration
standard.