8/19/03
910-198E
Model 8500
Page 2-1
2
CALIBRATION
Olympus NDT
TM
recommends monthly calibration (with regular
verification) of the Magna-Mike 8500 to ensure consistency and
accuracy of thickness readings. This chapter outlines how to choose a
target ball, when to calibrate, and how to calibrate.
2.1
Choosing a Ball
The Magna-Mike 8500 comes with three (3) different sized target balls.
In general, use the largest target ball that will move freely in the concave
areas that need to be measured. Consider the following criteria when
choosing a ball:
•
Minimum curvature of the material
•
Maximum thickness measurement
•
Accuracy needed for measurement
Once the criteria have been established, review the descriptions below
and Table 2-1 to choose an appropriate target ball.
Target Ball Descriptions
3/16" (4.76mm) diameter target ball
Useful for applications that require high accuracy, or where material is
thicker than the range offered by other target balls. However, the
ability to measure intricate corners is limited, and soft materials are
more likely to be compressed using this target ball.
1/8" (3.2mm) diameter target ball
Serves all standard applications, such as plastic blow molding, simple
shapes, and wall thicknesses up to 0.180" (4.6mm).
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