DMTA-10043-01EN, Rev. C, July 2016
Chapter 4
32
The default value for sound velocity is only an approximation of the sound velocity in
the test block material. The sound velocity of low to medium carbon alloy steel is
typically 5.740 mm/µs (0.2260 in./µs). Therefore, if you find the default value gives
inaccurate results on your material, refer to the calibration instructions.
To operate the 27MG Ultrasonic Thickness Gage for the first time, the initial setup
must be completed.
To perform the initial setup
1. Plug the transducer into the connector at the top end of the 27MG case.
When unplugging a transducer, ONLY pull on the molded plug, NOT on the cable.
2. Press the power [] key to turn the gage on.
The transducer should NOT be coupled to the test piece. After the power-up
screen, the word Do‑‑ appears on the display (see Figure 4-1 on page 32).
Figure 4‑1 Transducer zero compensation
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