DMTA-10040-01EN, Rev. E, February 2018
Chapter 5248
5.4.1.2 Displaying Reference Signals
The NORTEC 600 lets you add reference-signal displays (reference images) to the live
signal acquisition screen. This helps you to identify the flaw type that is displayed
(acquired) on the screen.
To display reference signals
1. Move the support ring to its original position (the position before you verified the
setup with support ring over a flaw).
2. Press the MEM menu key ( ), and then use the knob to select (highlight) the file
stored earlier, and press RECALL (B key).
3. Place the probe in a defect-free area near the tube’s support ring, and then press
the NULL foot switch.
4. Scan the tube.
5. Press and hold the REF SAVE ( ) key until you hear a beep.
The REF SAVE ( ) key can be used in the following two ways:
a) Quickly press the key once to save a setup in memory.
b) Press and hold the key until you hear a beep to store the current image as a
reference image, in a color complementary to the live signal.
6. Press the ERASE key ( ) or the ERASE foot switch.
The signals captured in the step above are used to create a reference image.
7. Place the probe in a defect-free area near the tube’s support ring, and then press
the NULL foot switch.
8. Scan the tube.
The live signal display should be nearly identical to the reference image (see
Figure 5-179 on page 249).
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