DMTA-10040-01EN, Rev. E, February 2018
Chapter 5220
Figure 5‑140 Adjusting the frequency 2 angle
6. Press the FREEZE key ( ) to unfreeze the acquisition.
7. Place the probe in a defect-free area near the tube’s support ring, and then press
the NULL foot switch. Scan the support ring and press the FREEZE key ( )
when done (see Figure 5-141 on page 220).
Figure 5‑141 The scan of the support ring
8. Press the ANGLE key ( ) twice, and then set the support ring’s frequency 2
signal angle (red) so that it is nearly horizontal (see Figure 5-142 on page 221).
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