Kaman digiVIT - Manual (Page 16)

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Last Revised 9/16/2013
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6.2 Calibration Fixturing
A good calibration starts with good calibration fixturing and reference. While in some cases the
digiVIT can be calibrated in-situ, it is typically calibrated using fixturing specially made for the
purpose. Small ranges may require special measuring equipment such as laser interferometers
for the best accuracy. If adequate fixturing is not available, Kaman offers a calibration service.
Figure 4 Typical Calibration Fixture
Refer to Appendix B for typical offset and range of recommended sensors.
6.3 2-Point Linear Calibration
Note: Any previous temperature compensation calibration will be voided when a 2 Pt. calibration
is performed.
The 2 point calibration is the simplest calibration and assumes the inherent output from the
sensor is linear. Over the first 10% of the range this is true in a general sense, however even
with 5% of the range; non-linearity is typically on the order of 1% of the calibrated full scale
output (though that is a pretty small absolute number typically). Over the standard full range
linearity could be as large as 16%.
1) Set the sensor flush with the target and move the micrometer to the MIN (offset) position.
Zero the micrometer.