Kaman digiVIT - Manual (Page 10)

www.kamansensors.com PART NO: 860525-001
Last Revised 9/16/2013
- 10 -
When temperature compensation is selected, the display shows a temperature relative to when
the calibration process started. It is displayed in degrees Celsius, but is not particularly
accurate in terms of absolute temperature.
The first step is to go to D1T1, it does not matter if it is at the 10% or 90% point (or any point)
and it does not matter what order you take the two temperature points in (rising or falling
temperature). At this displacement, change the temperature of the sensor noting the output on
the display. It is best to avoid transients so by heating (or cooling) the sensor it is best to wait
until any transients have passed to take the data point. The unit does not care what the actual
temperatures used for the calibration are and they do not have to be the same for both
displacements. One method is to heat the sensor up some number of degrees, take one data
point after any transients have passed, and take the second data point after it has cooled down
some. After the two temperature points have been collected at displacement 1, then position
the sensor at displacement 2 and take two temperature points again.
If changing the temperature resulted in slight offset and gain errors due to actual position
changes, a 2 or 3 point adjustment calibration can be performed (see section 4.8.2 or 4.8.4).
Temperature coefficients are not affected by a 2 point or 3 point adjustment calibration.
4.6 Display Setup
The display has several different output options:
4.6.1 Display Percent
Displays the percentage of the calibrated range where the sensor is positioned. Over and under
range will show greater than 100% and less than 0% but the voltage outputs will be constrained
to -1% to +101%. Current outputs are constrained to -5% to +105% (but will not go below
0mA).
4.6.2 Display Voltage
Displays the selected voltage output.
4.6.3 Display Current
Displays the selected current output.
4.7 Advanced Setup
4.7.1 Digital Filter
The display is always filtered but the analog outputs (voltage and current) are not. Resolution of
these outputs can be increased using a digital filter. The time constant options (tau) will vary