DMTA-10040-01EN, Rev. E, February 2018
Using the Instrument 263
Figure 5‑198 The support ring’s signal clipped (left) and with adjusted gain (right)
To calibrate frequency 2
1. Press the MAIN FILTER menu key ( ), followed by FREQ 2 (A key), and then
rotate the knob until 200 Hz or less is displayed.
2. Press the DISP menu key ( ), followed by CHANNEL (B key), and then rotate
the knob until FREQ 2 is displayed.
3. Place the probe in a defect-free area of the calibration standard near the thru-wall
flaw, and then press the NULL foot switch.
4. Scan the entire length of the tube, and press the FREEZE key ( ) when done
(see Figure 5-199 on page 264).
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