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Documentation Number FBDA0797 Manual 

B&B Electronics  --  PO Box 1040  --  Ottawa, IL  61350 

PH (815) 433-5100  --  FAX (815) 433-5105

 

 

Packing List 

 

 

Examine the shipping carton and the contents for physical 

damage.  The following items should be in the shipping carton: 

1.   FBDA module 
2.   This instruction manual 

If any of these items are damaged or missing, contact B&B 
Electronics immediately. 

Software 
 
 

Software is not included with the FBDA module.  This device is 

used in conjunction with a data acquisition device.  All of B&B 
Electronics’ data acquisition modules come complete with software 
that you can modify to meet your exact needs. 

 

Calibration 
 

The FBDA is calibrated at the factory.  The excitation 

voltage is set to 5VDC ± 0.05VDC and the gain is calibrated at 80 ± 
2. The process of calibrating the FBDA and your sensor will vary 
depending on the type of sensor being used.  An example calibration 
procedure is covered in Chapter 3. 

 

FBDA Specifications 

 

Size: 

          4.8 

2.2 

0.9 

in

 

Maximum Input Voltage from Sensor:  440mV (using Gain = 25) 
Output 

Voltage 

Range:     0.003V 

to 

11VDC 

Gain: 

          25, 

40, 

80, 

220-1000 

Maximum Gain Error:   

 

 

 

 

5% of gain setting max. 

Input 

Offset 

Voltage:      150

µ

V max. 

Input 

Offset 

Voltage 

Drift: 

    1.5

µ

V/

o

Excitation 

Voltage: 

      0.5VDC 

to 

+11VDC 

Operating Temperature Range:   

 

0 to 70

o

Power 

Requirements: 

     13-18VDC 

@10mA 

(does 

 

not include current draw  
from excitation voltage.) 

Summary of Contents for Strain Gauge/Load Cell Bridge Amplifier FBDA

Page 1: ...ber FBDA0797 This product Designed and Manufactured In Ottawa Illinois USA of domestic and imported parts by B B Electronics Mfg Co Inc 707 Dayton Road P O Box 1040 Ottawa IL 61350 PH 815 433 5100 FAX 815 433 5105 Internet http www bb elec com orders bb elec com support bb elec com 1997 B B Electronics Not Recommended for New Installations Please contact Technical Support for more information ...

Page 2: ...815 433 5100 FAX 815 433 5105 TABLE OF CONTENTS CHAPTER 1 INTRODUCTION 1 FEATURES 1 PACKING LIST 2 SOFTWARE 2 CALIBRATION 2 FBDA SPECIFICATIONS 2 CHAPTER 2 CONNECTIONS 3 POWER SUPPLY CONNECTIONS 3 SENSOR CONNECTIONS 3 DATA ACQUISITION CONNECTIONS 4 CHAPTER 3 GAIN SELECTION 7 CHAPTER 4 EXCITATION VOLTAGE 9 ...

Page 3: ...mber of different gain settings are available on the FBDA to accommodate a wide variety of voltage ranges The FBDA also provides an adjustable excitation voltage for the full bridge circuitry The sensor connections are made using terminal blocks and the A D connections are made through a DB 25 connector B B Electronics SDAXX and ADIO12 data acquisition modules are pin compatible with the FBDA This...

Page 4: ...that you can modify to meet your exact needs Calibration The FBDA is calibrated at the factory The excitation voltage is set to 5VDC 0 05VDC and the gain is calibrated at 80 2 The process of calibrating the FBDA and your sensor will vary depending on the type of sensor being used An example calibration procedure is covered in Chapter 3 FBDA Specifications Size 4 8 x 2 2 x 0 9 in Maximum Input Volt...

Page 5: ...A or another voltage source can be furnished by the user This excitation voltage is referenced with respect to ground which is the second connection marked GND The remaining two leads from the sensor carry the differential signal voltage that is to be conditioned and read by the data acquisition module These two leads are connected to SIG and SIG Consult your sensor manual to determine the signal ...

Page 6: ...ntains the DB 25 male pin assignments 1 denotes no connection 2 The conditioned sensor signal is available on pin 8 and is labeled Vout 3 Pin 9 is connected straight through to terminal block A D 1 no signal conditioning circuitry 4 Pins 17 and 18 are looped to each other to provide 5V to REF in the SDAXX line of A D modules 5 Pin 19 provides 0V to REF in the SDAXX line of A D modules Figure 2 1 c...

Page 7: ... 5105 Figure 2 1 Block Diagram of FBDA Connections A D Note Conditioned signal is available on DB 25 pin 8 6 4 5 Terminal Blocks 2 3 1 13V A D 1 13V REF GND GND 19 19 REF DB 25P Connector GND GND Vout Module FBDA EXV SIG SIG 8 8 9 9 17 18 17 18 A D 1 5V A D 0 7 1 GND 7 GND 1 Sensor and is labeled as Vout Module ...

Page 8: ...all of the required connections power supply A D converter sensor and excitation voltage and turn on the power 4 Set up your sensor to provide a known input signal for the FBDA If you are using a load cell place a known weight on the load cell This will produce a known input signal 5 The output voltage from the FBDA can be read from DB 25 pin 8 A D 0 on B B Electronics SDAXX data acquisition modul...

Page 9: ...red connections 2 Place a 1lb mass on the load cell Record the voltage on DB 25 pin 8 as Vouta Pin 8 is A D 0 on the SDAXX modules 3 Add a second 1lb mass onto the load cell Record the voltage on DB 25 pin 8 as Voutb 4 Subtract Vouta form Voutb The difference is the voltage Vout which corresponds to 1lb 5 Calculate what SIG SIG is for 1lb This is the voltage produced by the sensor 6 Use the Gain E...

Page 10: ...the voltage on the terminal block labeled EXV with respect to the GND terminal block Adjust P2 to change the excitation voltage The terminal block labeled A D 1 can be used to measure the excitation voltage Sensors that are comprised of Wheatstone bridges usually state the amount of output per volt of excitation voltage An example is 10mV output 1V of excitation If a 5V excitation voltage is used ...

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