Kaman KDM-8206 - Manual (Page 14)

With the 250 ohm load and current meter connected as in FIGURE 4, verify the calibration. Some
adjustment of the front panel controls may be necessary to “fine tune” the current output.
1. Position the target to minimum displacement (i.e. offset). Adjust the MIN controls until the
output is 4 mA.
2. Reposition the target to mid-scale. Adjust the MID controls until the output voltage reads 12
mA.
3. Reposition the target to full-scale displacement. Adjust the MAX controls until the output
reads 20 mA.
4. Repeat steps 1 through 3 as many times as necessary until the desired output at each point
is obtained without further adjustment.
4.3.3 Bipolar Voltage Output Calibration Procedure
When you use this calibration procedure, output voltage will range from a negative voltage for the first
half of your measuring range to a positive output for the second half of the range.
VDC
offset
DISPLACEMENT
Bipolar Output Calibration
Use this method when your application requires a positive and negative output deviation from some
nominal value, in this case, 0 VDC
In a bipolar calibration, clockwise rotation of the MIN controls cause output to go more positive;
whereas, clockwise rotation of the MID controls increases gain more negatively in the lower half of
the range and more positively in the upper half. Because of this, you will adjust the MID controls
when the target is closest to the sensor and adjust the MIN controls at the mid-scale position.
1. Install the sensor in the calibration or application fixture at the offset distance.
2. Position the target using the micrometer fixture or spacers so that the total distance between
the sensor and target is equal to the specified full-scale displacement for that sensor, plus
offset.
3. Adjust the MAX controls until the output is equal to the desired full-scale reading.
4. Reposition the target so that it is at mid-scale and adjust the MIN controls until the output
reads zero.
5. Reposition the target to minimum displacement (i.e. offset) and adjust the MID controls until
output reads the desired negative output voltage.
Kaman Precision Products PART NO: 860516-001
www.kamansensors.com Last Revised: 6/20/2011
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