Kaman digiVIT - Manual (Page 30)

www.kamansensors.com PART NO: 860525-001
Last Revised 9/16/2013
- 30 -
It is best to choose points D1 and D2 at 10% and 90% of the range (D1 could be 90% and D2
could be 10% -- does not matter). If the expected usage is in a narrower range, better results
could be obtained in the important displacement band by calibrating over the narrower range.
1) Select 'Cal Setup -> Temp Cmp Sensor' from the front panel.
The prompt will read
'GotoD1T1 relC 0’. At this point it expects to be at Displacement 1 Temperature 1 in a fixture. A
good method is to fixture it at 90% of displacement (approximately -- it does not matter
precisely) and the heat the sensor head (if cable is going to be in the hot environment it should
also be included). You will see the relC x indicator rise as temperature increases and fall as it
decreases. It works best to heat it up and then let it cool down just a bit before taking the first
data point so that transient effects are not included. Typically if the sensor is heated until the rel
C reads 10 or 12 or more that is sufficient. Let it cool down slightly to say 11 or even 9 and type
‘CT 0’.
2) The prompt will read 'GotoD1T2 relC 8'. Let it cool down until it is close to where it started
though it is not necessary to let it cool down all the way. Then type ‘CT 1’.
3) The prompt will read 'GotoD2T1 relC 1'. Reposition the sensor in the fixturing to be at a
second displacement. Typically 10% of the range is good setting. Again it is best to heat it up,
let the transient go away and press the enter button at a rel C of 10 or 12. After the transient
has gone away, type ‘CT 2’.
4) The prompt will read 'GotoD2T2 relC 9'. After the temperature goes down to near 1
or 2 press
type ‘CT 3’. Type ‘CT 4’ to complete this procedure if the compensation is for the
sensor. Or, type ‘CT 5’ to complete this procedure if the compensation is for the electronics.
A 0 is returned on a good and a 1 is returned on a bad temperature compensation. A full
recalibration may be required on a bad calibration.