Kaman KD-2306 - Manual (Page 11)

Kaman Precision Products PART NO: 860512-001
www.kamansensors.com Last Revised: 8/3/2009
11
4. Reposition the target to minimum displacement (i.e. offset). Adjust the MIN (Zero) controls
until the output voltage reads 0 VDC.
5. Reposition the target to mid-scale plus offset and adjust the MID (Gain) controls until the
output voltage reads exactly half of the full-scale value.
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
(Linearity) 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. For example, if the output reads 9.5 volts and the desired reading is 10.0, adjust the
MAX (Linearity) controls until the output reads 10.5.
7. Repeat Steps 4 through 6 as many times as necessary until the desired output voltage at
each point is obtained without additional adjustment.
4.3.2 Full Scale Calibration Procedure (Current)
Full Scale Calibration for the Current (4-20mA) output is similar to voltage calibration. This procedure
requires a current meter or multimeter with a current range. Typical connections for current
calibration are shown below:
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 MID (Gain) controls so that system output equals 20 mA
+ -
Current Meter
Load
250 ohm
(Typical)
KAMAN
SENSOR
COARSE
FINE
MAX
MID
MIN
1 2 3
5
4
6 7 8
9 10 11
13
12
14 15 16