DMTA-10040-01EN, Rev. E, February 2018
Using the Instrument
137
Figure 5
‑
23 The Sub
‑
Surface application
To calibrate the signals
1.
Press the MAIN FILTER menu key (
) once, and then set the
FREQ
(A key) to
220 Hz
.
2.
Place the probe directly on the good fastener on the standard, and then press and
hold the A-LIFT NULL key (
) to activate the automatic lift-off function. When
LIFT PROBE
is displayed, lift the probe vertically (try to avoid tilting) and wait
for the message to disappear.
3.
Repeat step 2 until you become familiar with the automatic lift-off function.
It may take some practice to obtain the proper timing with the automatic lift-off
function, but once mastered, this function will help you obtain a faster calibration.
4.
Place the probe above the good fastener again, and then press the A-LIFT NULL
key (
).
5.
Lift the probe into the air, and then place the probe on the cracked fastener and
press the FREEZE key (
).
The resulting signal is shown in Figure 5-24 on page 138.
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