8/19/03
910-198E
Model 8500
Page 1-1
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GENERAL INFORMATION
Panametrics-NDT
TM
’ Magna-Mike 8500 is a small, lightweight
thickness gage designed to make measurements of nonferrous
materials such as plastics, glass, composites, aluminum, and titanium.
Accuracy is generally not affected by material shape or internal
properties.
The Magna-Mike 8500 is based on the Hall Effect Principle. Wall
thickness is measured by placing a small steel target ball on one side of
test material and the magnetic probe on the opposite side. The probe’s
Hall Effect sensor measures the distance between the probe tip and the
ball, instantly displaying a thickness reading.
As the sample thickness changes, the field strength in the probe tip also
changes from a minimum when the ball is far away, to a maximum
when the ball rests, centered on the tip. These field strengths however,
are different for each size target ball and vary from probe to probe. The
control unit, therefore, employs a numerical look-up table to translate
these changes in field strength into thickness values.
Only after the calibration procedure is performed, and only if the
calibrated state of the instrument is maintained as directed in Section 2
of this manual, will the thickness values obtained from the Magna-
Mike 8500 be accurate and meaningful.
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