User Manual
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Kaman Precision Products PART NO: 860522-001
www.kamansensors.com
Last Revised 11/16/2012
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PART 6 - TROUBLESHOOTING
5.1 Insufficient Gain
If attempting to recalibrate for a specific sensitivity, measuring range, or for a target different from
factory calibration specifications, there may be insufficient gain control to do this. You may need
to decrease the desired output in order to calibrate the system.
Another cause for insufficient gain could be excessive loading of the sensors by conductive
material (other than the target) within the field of the sensors. The sensor’s field is approximately
three times its diameter.
5.2 Unable to Zero
The DIT-5200L is an exceptionally stable measuring system. Long term drift is less than 2 micro-
inches per month. If the unit does not work, this would most likely be discovered during the
functional test. If you are unable to calibrate your system in no more than two iterations, the
problem is most likely poor mechanical repeatability in the fixturing or actuating mechanisms. To
determine this:
1. Do not make any adjustments to the calibration controls. (Record how much time the next
step takes).
2. Do at least 12 to 15 iterations of moving the target from null to full range and back to null.
Record the output at null each time. If successive readings of the output at null consistently
vary with no clear trend (drift) in one direction or the other, the problem is mechanical
repeatability.
3. Stabilize the target at null and record the output. Leave the target at null for the same length
of time it took to accomplish step two and monitor the output.
4. If the output remains constant, this confirms the problem is mechanical repeatability.
If the output drifts, the problem could be drift in the fixturing, drift in the target positioning servos,
or drift in the DIT-5200L.
If you can positively eliminate all other variables as the source of the problem, consult Kaman
Precision Products.
5.3 Poor Non-Linearity
Poor non-linearity is typically the result of additional loading on the sensor or the sensor head
being slightly tilted.