Kaman digiVIT - Manual (Page 29)

www.kamansensors.com PART NO: 860525-001
Last Revised 9/16/2013
- 29 -
D.4 - 2 Point Adjustment
1) Position the sensor at the MIN (offset) position and type ‘CAZ’.
2) Position the sensor at the MAX (full range + offset) position and type ‘CAF’ to take data, then
‘CAD’ to complete the adjustment.
The adjustment is now complete. If the calibration is good, the digiVIT will return a status of 0.
A status of 1 is returned on a bad adjustment. If the adjustment is not good, a full recalibration
may be required.
D.5 - 3 Point Adjustment
1) Position the sensor at the MIN (offset) position and type ‘CAZ’.
2) Position the sensor at the MID (mid range or 50%) position and type ‘CAM’
3) Position the sensor at the MAX (full range + offset) position and type ‘CAF’ to take data, then
‘CAD’ to complete the adjustment.
The adjustment is now complete. If the calibration is good, the digiVIT will return a status of 0.
A status of 1 is returned on a bad adjustment. If the adjustment is not good, a full recalibration
may be required.
D.6 - Temperature Compensation (Electronics and Sensor)
While the digiVIT optimizes the sensor output for inherent temperature stability it can be
improved further by temperature compensation. The temperature of the sensor is measured
and used to compensate the output based on equations in the digiVIT. Optionally the
Electronics can also be temperature compensated separately from the sensors and uses a built
in temperature sensor for the compensation. In either case the compensation method is the
same. These equations are set by collecting data at 4 temperature points:
D1T1 -- Displacement 1, Temperature 1
D1T2 -- Displacement 1, Temperature 2
D2T1 -- Displacement 2, Temperature 1
D2T2 -- Displacement 2, Temperature 2
The digiVIT assumes that D1 is the same physical position for both T1 and T2. It does not
assume that the temperature of D2T1 is the same as D1T1.
As with any calibration, temperature compensation depends on good fixturing. To some degree
if the fixturing is moving in temperature (due to material coefficient of thermal expansion – CTE)
the same way it does in the application, the digiVIT will tend to compensate for it. In many
cases the digiVIT can be temperature compensated in-situ.