Cooper DCI 120 User Manual

DCI 120

20Hz Bridge/Strain Recorder

DCI 120-10

10mV, 20 Hz, Bridge Recorder

DCI 120-25

25mV, 20 Hz, Bridge Recorder

DCI 120-100

100mV, 20 Hz, Bridge Recorder

DCI 120-1000

1000mV, 20 Hz, Bridge Recorder

Configuring the Data Logger

Voltage Divider Configuration

The Voltage Divider configuration is a simple and frequently used setup to measure bridge strain.

1. Jumper between POWER and REF+

2. Place a 12kΩ resistor between REF+ and REF-

3. Jumper between REF- and IN+

4. Place the strain gage between IN+ and IN-

5. Jumper between IN- and GROUND

Conversions

To convert the Voltage values into Ohms, use the following formula:

Example: The software reports a voltage of 20mV in the circuit described above. The strain gage resistance is

therefore:

The resistor Ro between REF+ and REF- and the strain gage value form the mV reference (mVref). This may
be expressed as:

The Bridge120-25 has a resolution of about 2μV. If the resistance of the strain gage changes by +.1, the device
would measure a change of approximately +
approximately:

Note: The maximum voltage must be kept within the specified input range. See data sheet for details.

20μV. Conversely, this voltage resolution translates in Ohms to

Product Notes

LEDs

Once started, the LED will flash at the selected reading rate to indicate that the device is running.

CF 179 1 Rev A 2008.07.08

Installation Guide

Installing the Interface cable

- IFC200, IFC202 or IFC300; Refer to the “Quick Start Guide” included in the package.

- IFC110, IFC102 or IFC103; Plug the serial cable into the port and verify it is secure.

- USB-1 or USB-101; Install the USB drivers from the CD provided in the kit, than plug the USB cable into the
computer and the serial cable into the serial port.

Installing the software

Insert the Software CD in the CD-ROM Drive. If the autorun does not appear, locate the drive on the computer

and double click on Autorun.exe. Follow the instructions provided in the Wizard.

Connecting the data logger

- Once the software is installed and running, plug the interface cable into the data logger.

- Click the Communication Menu, then Auto Configure Port.

- After a moment, a box similar to the following will appear;

- Click OK. The Device Status box will appear. Click OK.

- At this point, communications have been configured for your logger. These settings can be found under the

Communication Menu.

Note: For additional installation instructions refer to your “Data Logger & Software Operating Manual”.

Device Operation

Starting the data logger

- Click Device Menu then Start Device.

- Choose the desired start method.

- Choose the start parameters by selecting a Reading Rate suitable

for your application.

- Enter in any other desired parameters and click Start.

- A box will appear stating the data logger has been started. Click OK.

- Disconnect the data logger from the interface cable and place it in the
environment to measure.

Note: The device will stop recording data when the end of
memory is reached or the device is stopped. At this point the
device cannot be restarted until it has been re-armed by the
computer.

Downloading data from a data logger

- Connect the data logger to the interface cable.

- Click the Device Menu then Read Device Data. This will offload all recorded data onto the PC.

Device Maintenance

Battery Replacement

Materials:

Small Phillips Head Screwdriver
Replacement Battery (LTC-7PN)

- Puncture the center of the back label with the screw driver and unscrew the enclosure.

- Remove the battery by pulling it perpendicular to the circuit board.

- Insert the new battery into the terminals and verify it is secure.

- Screw the enclosure back together securely.

Note: Be sure not to over tighten the screws or strip the threads.
WARNING: FIRE, EXPLOSION, AND SEVERE BURN HAZARD. DO NOT SHORT CIRCUIT, CHARGE,
FORCE OVER DISCHARGE, DISASSEMBLE, CRUSH, PENETRATE OR INCINERATE. BATTERY MAY
LEAK OR EXPLODE IF HEATED ABOVE 80°C (176°F).

CF 179 2 Rev A 2008.07.08