Kaman KDM-8206 - Manual (Page 13)

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.
For example, if the output reads 9.5 volts and the desired reading is 10.0, adjust the MAX
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. The procedure
to calibrate for current output is performed in two steps.
STEP 1:
Perform a full scale calibration procedure for 0-10 VDC output per section 3.2.1. The 4-20 mA output
has been pre-set at the factory to correspond to a voltage output of 0-10 VDC. It is designed to give
full range only for a 0-10 VDC output.
Leave the sensor in the calibration fixture as it is required for step 2.
STEP 2:
This procedure requires a current meter or multimeter with a current range. Connect the current
meter in series with a 250 ohm load. Monitor the current at the output Terminal Block on the rear
panel of the rack or between pins A20 and A22 on the Euro connector.
Kaman Precision Products PART NO: 860516-001
www.kamansensors.com Last Revised: 6/20/2011
13
Figure 5 4-20mA Output Connections
Note the I+/I- output is a true current source. Shorting the two pins together will not cause damage.
Calibration uses a 250 ohm resistor to simulate a current receiver for the highest accuracy.
+ -
Current Meter
Terminal Block I-
Or Euro connector pin A22
Load
250 ohm
(Typical)
Terminal Block I+
Or Euro c
A20 onnector pin