Checkline DFX-7 - Manual (Page 55)

DFX-7 Ultrasonic Flaw Detector
51
When TRIG mode is enabled, the calculated measurements will be displayed below
the waveform display area at (A), and the signal amplitude as a percentage of full
screen height at (B).
Curved Surface Correction:
The DFX-7 will also compensate for convex curved surfaces of longitudinally welded
pipes. A curved surface will produce a greater sound path than a flat surface will,
using a transducer with a given angle. The user should consider the angle used on
curved surfaces, with respect to the material thickness, in order to be sure a
reflection will occur from the opposite surface of the test material. In order to utilize
the curved surface compensation, the outside diameter must be entered into the
DFX-7.
6.3 Setup Trigonometry Mode
This section provides a step by step procedure to enable and setup the TRIG mode.
Note: A two point calibration should be done prior to proceeding. Refer to Chapter
Five for the calibration procedures.