PocketMIKE Operating Manual
Page 21
Application
Considerations
Measuring thickness under certain conditions requires special consid-
erations. In this chapter you will find a summary of special consider-
ations related to the following variables in testing applications:
◆
Material Consistency in Test Specimen (section 6.1)
◆
Flaws in the Specimen Being Tested (section 6.2)
◆
Condition of the Test Specimen’s Surface (section 6.3)
◆
Test Specimens with Curved Surfaces (section 6.4)
6.1 Material Consistency in Test
Specimen
Maximum measurement accuracy will be obtained if the work piece and
the calibration piece are the same temperature, shape, material, and size.
NOTICE
Since sound velocity varies from test piece to work piece, accuracy of
measurement depends on consistency of sound velocity. Sound velocity
also varies with internal stress, so that heat treatment of the material
will also effect accuracy. The following table expresses accuracy
variations for some common materials. Actual accuracy may be different.
Aluminum
+/– 2%
Cast Iron
+/– 8%
Steel
+/– 0.5%
Nylon
+/– 10%
NOTE:
At velocities greater than 6240 m/s the instrument will auto-
matically adjust its gain to improve measurement consistency.
NOTE:
These specifications are intended only as a general guide.
PocketMIKE Operating Manual
Page 21
Application
Considerations
Measuring thickness under certain conditions requires special consid-
erations. In this chapter you will find a summary of special consider-
ations related to the following variables in testing applications:
◆
Material Consistency in Test Specimen (section 6.1)
◆
Flaws in the Specimen Being Tested (section 6.2)
◆
Condition of the Test Specimen’s Surface (section 6.3)
◆
Test Specimens with Curved Surfaces (section 6.4)
6.1 Material Consistency in Test
Specimen
Maximum measurement accuracy will be obtained if the work piece and
the calibration piece are the same temperature, shape, material, and size.
NOTICE
Since sound velocity varies from test piece to work piece, accuracy of
measurement depends on consistency of sound velocity. Sound velocity
also varies with internal stress, so that heat treatment of the material
will also effect accuracy. The following table expresses accuracy
variations for some common materials. Actual accuracy may be different.
Aluminum
+/– 2%
Cast Iron
+/– 8%
Steel
+/– 0.5%
Nylon
+/– 10%
NOTE:
At velocities greater than 6240 m/s the instrument will auto-
matically adjust its gain to improve measurement consistency.
NOTE:
These specifications are intended only as a general guide.
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