Kaman KD-5100 - Manual (Page 24)

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13. TROUBLESHOOTING
13-a. What if the above calibration process doesn’t work, if there is not enough gain for
the desired output, or if you cannot get a consistent 0V±10mV?
13-1. Insufficient Gain
13-1a. To repeat, if attempting to recalibrate for a sensitivity, measuring range, or target
different from factory calibration specifications, there may be insufficient gain control.
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.
13-2. Can’t Zero
13-2a. The KD-5100 is an extremely 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 Abbreviated Function Test, Section J. Our experience in hundreds
of applications over years of use is that these systems either work or don’t, and are not
subject to “quirky” or “drifty” behavior. 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.
13-3. There is a way to check it out:
Step 1. Do not make any adjustments to the calibration controls. Record how much time
the next step takes.
Step 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 constantly very with no clear trend (drift) in one direction or the other, the problem is
mechanical repeatability.
Step 3. Now, 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.
a. If the output remains constant, this confirms the problem was mechanical
repeatability.
b. If the output drifts, the problem could be:
(1) drift in the fixturing
(2) drift in the target positioning servos
(3) drift in the KD-5100
13-3a. If you can positively eliminate all other variables as the source of the problem,
return the KD-5100 to Kaman. Remember, if you are unable to calibrate the KD-5100