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Chapter VIII
Helpful Hints on Operation
A. Backlight
The T-Mike E features a backlit LCD display. The display illuminates when an echo is detected. Using the
backlight will significantly reduce battery life. Therefore, you may wish to deactivate the backlight when using
the T-Mike E in a well-lit environment.
B. Clean the Surface
Clean the probe and the material to be measured and apply only enough couplant to obtain a steady, valid
reading. Usually one drop is enough.
C. Material Consistency
Maximum measurement accuracy will be obtained if the work piece and the calibration piece are the same
temperature, shape, material, and size.
Notice
Since velocity of sound varies from test piece to work piece, accuracy of measurement depends on consistency
of ultrasonic velocity. Ultrasonic velocity also varies with internal stress, so that heat treatment of the material
will also affect accuracy. The following table expresses accuracy variations for some common materials.
NOTE: These specifications are intended only as a general guide. Actual accuracy may be different.
Aluminum +/- 2% Cast Iron +/- 8%
Steel +/- 0.5% Nylon +/- 10%
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