Kaman KD-2306 User Manual
KD-2306
Non-contact Displacement Measuring
System User’s Manual
This apparatus, when installed and operated per the manufacturer’s recommendations,
conforms with the protection requirements of EC Council Directive 89/336/EEC on the
approximation of the laws of the member states relating to Electromagnetic Compatibility. Refer
to the KD-2306 Declaration of Conformity or contact Kaman Measuring Systems for details.
Copyright © 2009 Kaman Precision Products
PART NO: 860512-001 A Division of Kaman Aerospace Corporation
Last Revised: 8/3/2009 Measuring Systems
217 Smith Street
Middletown, CT 06457
www.kamansensors.com
Table of Contents
Part 1 – KD-2306 Description
...........................................................3
Part 2 - Connecting the KD-2306.....................................................4
Part 3 – KD-2306 Outputs.................................................................5
3.1 Single Ended Voltage Output:........................................................5
3.2 Differential Voltage Output:............................................................6
3.3 4-20 mA Current Output:................................................................7
Part 4 - Calibrating the KD-2306......................................................7
4.1 Calibration Controls .......................................................................7
4.1.1 MIN (Zero) Controls...................................................................8
4.1.2 MID (Gain) Controls....................................................................8
4.1.3 MAX (Linearity) Controls.............................................................8
4.2 Calibration Methods.......................................................................9
4.3 Calibration Procedures ................................................................10
4.3.1 Full Scale Calibration Procedure (Voltage)...............................10
4.3.2 Full Scale Calibration Procedure (Current)...............................11
4.3.3 Bipolar Voltage Output Calibration Procedure..........................12
4.3.4 Alternate Bipolar Voltage Output Calibration............................13
4.3.5 High Accuracy Band Voltage Calibration..................................13
Part 5 - Synchronizing Multiple KD-2306 Systems.....................15
Part 6 - System Modifications.........................................................15
6.1 Temperature Compensation........................................................15
6.2 Bridge Card..................................................................................16
6.3 Target Material.............................................................................16
6.4 Sensor Cable Length...................................................................16
Kaman Precision Products PART NO: 860512-001
www.kamansensors.com
Last Revised: 8/3/2009
2
Part 1 – KD-2306 Description
Kaman Precision Products’ Model KD-2306 is a non-contact, linear, analog displacement measuring
system. The system operates on a traditional inductive bridge circuit. This easy-to-use, versatile
system can be utilized for precision static and dynamic measurements of conductive targets.
The sensor coil makes up one or two legs (depending on single or dual coil sensor) of a balance d
bridge network. As the target changes position within the sensor field, the bridge network senses
impedance changes in the sensor coil. These changes are converted to an analog voltage or
current signal directly proportional to target displacement.
The KD-2306 system consists of two subassemblies: sensor with either integral or removable
cable, and signal conditioning electronics module in a DIN mounting enclosure.
The system is preconfigured at the factory for a particular sensor, cable length, target material,
and calibrated measuring range.
The KD-2306 is a lead-free, RoHS compliant, CE Marked design. To maintain the CE Mark, the
following precautions are necessary:
1) I/O cable length is limited to a maximum of 30 m (100 ft).
2) The electronics are supplied with a cover over the calibration potentiometers on the front
panel to protect the circuit from damage due to Electrostatic Discharge (ESD). Removal
of the cover makes the unit susceptible to ESD damage and it must be handled
accordingly.
3) The electronics power and I/O must be isolated from the AC Mains and not subject to
transient over-voltages. That is, it must be powered by a D.C. secondary circuit that is
reliably grounded, capacitively- filtered, with peak-to-peak ripple less than 10% of the
D.C. component.
Kaman Precision Products PART NO: 860512-001
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Last Revised: 8/3/2009
3
Part 2 - Connecting the KD-2306
The sensor is always connected to the twin BNC connector on the front panel. All other input,
output, and synchronization connections to the KD-2306 are at the terminals as noted in the table
below. More details on these connections are contained in subsequent sections of this manual.
1
5
COARSE
MAX
MID
6
3
7
FINE
4
8
2
MIN
SENSOR
KAMAN
Input power is connected to terminals 11 and 12 as shown. A good quality linear or switching supply
with an output of +15 to 30 VDC is recommended for best (lowest noise) performance. Consult the
Accessories Data Sheet for recommended power supply options.
9
13
10
14
11
15
12
16
1 Voltage Output +
2 4-20 mA Output High
3 Ground
4 Synchronization In
5 Voltage Output 6 4-20 mA Output Low
7 Ground
8 Earth Ground
9 NC
10 Ground
11 Voltage Input +15 to 30 VDC
12 Ground
13 Ground
14 Ground
15 Synchronization Out
16 Ground
Ground
+V in
Kaman Precision Products PART NO: 860512-001
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Last Revised: 8/3/2009
4
Part 3 – KD-2306 Outputs
The KD-2306 system has three different analog outputs. All three outputs are always present,
but only one is calibrated. Adjustment of the calibration controls for one of these outputs will drive
the other outputs out of calibration.
Voltage outputs have a maximum single ended span of 10 VDC. Unless otherwise specified, the
system will be factory calibrated for 0-10 VDC over the full measuring range of the sensor. Other
typical outputs are 0-5 and ±5 VDC. The KD-2306 output may also be adjusted to provide a
specific sensitivity, such as 1 V/mm.
3.1 Single Ended Voltage Output:
Unless otherwise specified, this output will be calibrated for 0-10 VDC output at the factory. For
single ended voltage output, connect V+ to terminal 1 and signal return to terminal 3 as shown.
Kaman Precision Products PART NO: 860512-001
www.kamansensors.com
2
1
5
6
COARSE
MAX
MID
MIN
SENSOR
KAMAN
10
9
13
14
3
7
FINE
11
15
4
8
Ground
+ V out
12
16
Last Revised: 8/3/2009
5
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