Kaman KDM-8206 - Manual (Page 15)

Kaman Precision Products PART NO: 860516-001
www.kamansensors.com Last Revised: 6/20/2011
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6. Reposition the target to full-scale displacement, plus offset. Read the output voltage and
note the difference between the actual reading and the desired reading. Adjust the MAX
controls until the output reads the desired voltage level, then continue past the desired
reading by an amount equal to the first difference you noted. This technique is called 100%
oversetting and is used to reduce the number of iterations needed to calibrate the system.
7. Repeat Steps 4 through 6 as many times as necessary until the desired output voltage at
each point obtained without additional adjustment.
4.3.4 Alternate Bipolar Voltage Output Calibration
You may not be able to achieve maximum sensitivity using this technique. This method may be
preferred if the maximum voltage does not exceed +10 VDC.
1. Use the Full-Scale procedure in section 4.3.1 to calibrate the system initially from 0 VDC to
the desired maximum.
2. Position the target at mid-scale and adjust the MIN control counterclockwise until output
reads 0 VDC.
3. Check the two ends, the points closest and farthest from the sensor, to verify they equal
minus and plus one half of the original full-scale output voltage. For example, if your original
full-scale voltage was 0-4 VDC, it should now be -2 to +2.
In theory, adjusting the MIN controls in this technique should not affect sensitivity or linearity. In
practice, however, you may see a very slight change indicated by voltage readings other than minus
and plus one-half full scale
. The primary bipolar technique can now be used to fine-tune the
calibration.