Kaman digiVIT - Manual (Page 17)

www.kamansensors.com PART NO: 860525-001
Last Revised 9/16/2013
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2) Position the micrometer at the desired MAX (full scale range + offset) position.
3) Select 'Cal Setup -> Lineariz Output -> 2 Pt. Lin. Cal.'. The unit will prompt 'Goto MAX Prs
Entr'. With the sensor at MAX press the <enter> button. The unit will prompt 'Scanning Pls
Wait' -- this can take approximately 20 seconds. The unit is optimizing the setup for the
particular sensor, range, and target. Wait for this to finish.
4) The digiVIT will prompt 'Goto MIN Prs Entr'. Position the micrometer to the MIN (offset)
position and press <enter>.
5) The digiVIT will prompt 'Goto 100% Prs Entr'. Position the micrometer to the MAX position
and press <enter>.
The calibration is now complete. If the output reads 100.00% (or close to it) the calibration is
good. If 'Cal Error' is displayed, the digiVIT did not acquire enough analog to digital converter
counts between readings and the calibration sequence must be repeated.
6.4 6-Point Polynomial Calibration
Note: Any previous temperature compensation calibration will be voided when a 6 Pt. calibration
is performed.
The 6 point calibration is a relatively simple calibration that generally yields excellent results. It
assumes the inherent output from the sensor will have a reasonable fit to a 5th order polynomial
-- generally a good assumption over most ranges. It will result in typical non-linearity on the
order of 0.1% to 0.3%. Most of the procedure is the same as the 2 point calibration except with
more data points. This calibration assumes the range is divided into 5 equal intervals. For
example: a 0.5mm range will be divided into 0.5/5 = 0.1mm intervals.
1) Set the sensor flush with the target and move the micrometer to the MIN (offset) position.
Zero the micrometer.
2) Position the micrometer at the desired MAX (full scale range + offset) position.
3) Select 'Cal Setup -> Lineariz Output -> 6 Pt. Poly Cal.'. The unit will prompt 'Goto MAX Prs
Entr'. With the sensor at full scale press the <enter> button. The unit will prompt 'Scanning Pls
Wait' -- this can take approximately 20 seconds. The unit is optimizing the setup for the
particular sensor, range, and target. Wait for this to finish.
4) The digiVIT will prompt 'Goto MIN Prs Entr'. Go to the MIN position and press <enter>.
5) The digiVIT will prompt 'Goto 20% Prs Entr'. Go to the 20% (0.1mm in our example) position
and press <enter>.
6) Repeat step 5 for 40%, 60%, and 80% positions
7) The digiVIT will prompt 'Goto 100% Prs Entr'. Position the micrometer to the MAX position
and press <enter>.