Strain Gauge/Load Cell Bridge Amplifier Model FBDA Documenta

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Strain Gauge/Load Cell Bridge Amplifier Model FBDA Documenta

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Strain Gauge/Load Cell Bridge Amplifier
Model FBDA
Documentation Number FBDA0797
This product
Designed Manufactured Ottawa, Illinois
domestic imported parts
Electronics Mfg. Inc.
Dayton Road P.O. 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Internet: http://www.bb-elec.com orders@bb-elec.com support@bb.elec.com
1997 Electronics
Documentation Number FBDA0797 Manual Cover Page Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
TABLE CONTENTS
CHAPTER INTRODUCTION.1 FEATURES PACKING LIST SOFTWARE CALIBRATION FBDA SPECIFICATIONS CHAPTER CONNECTIONS.3 POWER SUPPLY CONNECTIONS SENSOR CONNECTIONS DATA ACQUISITION CONNECTIONS CHAPTER GAIN SELECTION.7 CHAPTER EXCITATION VOLTAGE
Documentation Number FBDA0797 Manual Table Contents Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Chapter Introduction
Features FBDA signal conditioning module that allows measure voltages produced full-bridge sensors using data acquisition module. This module condition signals from Strain Gauges, Load Cells, Pressure Sensors, other Full-Bridge Transducer Sensors. number different gain settings available FBDA accommodate wide variety voltage ranges. FBDA also provides adjustable excitation voltage full-bridge circuitry. sensor connections made using terminal blocks, connections made through DB-25 connector. Electronics' SDAXX, ADIO12 data acquisition modules compatible with FBDA. This allows simply plug data acquisition modules mentioned above into FBDA, connections complete. SPDA data acquisition modules also used with FBDA.
Figure 1.1: FBDA Module
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Packing List Examine shipping carton contents physical damage. following items should shipping carton: FBDA module This instruction manual these items damaged missing, contact Electronics immediately. Software Software included with FBDA module. This device used conjunction with data acquisition device. Electronics' data acquisition modules come complete with software that modify meet your exact needs. Calibration FBDA calibrated factory. excitation voltage 5VDC 0.05VDC gain calibrated process calibrating FBDA your sensor will vary depending type sensor being used. example calibration procedure covered Chapter FBDA Specifications Size: Maximum Input Voltage from Sensor: Output Voltage Range: Gain: Maximum Gain Error: Input Offset Voltage: Input Offset Voltage Drift: Excitation Voltage: Operating Temperature Range: Power Requirements: 440mV (using Gain 0.003V 11VDC 220-1000 gain setting max. 150µV max. 1.5µV/ 0.5VDC +11VDC 13-18VDC @10mA (does include current draw from excitation voltage.)
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Chapter Connections
Power Supply Connections FBDA module requires 18VDC 10mA. Model 232PS2 available from Electronics recommended. Although 232PS2 12VDC power supply, outputs voltage above 13VDC when less than 10mA being drawn from power supply connected terminal blocks marked +13V GND. Make sure polarity power supply correct (the white striped wire 232PS2 positive lead). Sensor Connections Most full-bridge sensor circuits require four connections sensor operate properly. These connections will made using terminal blocks. First, excitation voltage required excite bridge circuitry. This done using adjustable excitation voltage (marked EXV) available FBDA, another voltage source furnished user. This excitation voltage referenced with respect ground, which second connection (marked GND). remaining leads from sensor carry differential signal voltage that conditioned read data acquisition module. These leads connected SIG+ SIG-. Consult your sensor manual determine signal lead polarity. Table shows terminal block assignments.
Table 2.1: Terminal Block Assignments
Terminal Function Block Name SIG+ Positive Signal Lead Input SIGNegative Signal Lead Input Excitation Voltage Output Converter channel Input +13V Power Supply Connection Input Power Supply Connection Input Note: connected straight through from terminal blocks DB-25 This allows access channel Electronic's SDAXX line converters. This channel read voltages between 5VDC (useful calibrating excitation voltage). This channel signal conditioning circuitry. simply connected data acquisition module.
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Data Acquisition Connections connections Data Acquisition Module made through DB-25 (male) connector. FBDA compatible with Electronics' SDAXX, ADIO12 modules. This allows simply plug FBDA into above data acquisition modules, data acquisition module connections FBDA complete. Table contains DB-25 (male) assignments.
Table 2.2: DB-25 (Male) Assignments
DB-25
Function -GND Vout
DB-25
Function -looped looped
denotes connection. conditioned sensor signal available labeled Vout. connected straight through terminal block signal conditioning circuitry). Pins looped each other provide REF+ SDAXX line modules. provides REF- SDAXX line modules. Figure contains diagram connections required read signal produced sensor.
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Sensor
Note: Conditioned signal available DB-25 labeled Vout.
Terminal Blocks
DB-25P Connector
+13V
FBDA Module
+13V
Figure 2.1: Block Diagram FBDA Connections
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Module
SIGSIG+
Vout
REF+ REF-
Chapter Gain Selection
FBDA several different gain settings provide largest possible voltage range converter. gain FBDA selected using jumper, jumper pins (labeled 1-6), potentiometer (labeled P1). FBDA calibrated factory have gain change gain FBDA following steps should followed: Remove cover from FBDA using small slotted screwdriver. There jumper pins labeled 1-6. Place jumper pins selected from Table below. Placing jumper selected pins will gain near values listed Table 3.1. Make required connections (power supply, converter, sensor, excitation voltage), turn power. your sensor provide known input signal FBDA. using load cell, place known weight load cell. This will produce known input signal. output voltage from FBDA read from DB-25 (A/D Electronics' SDAXX data acquisition modules). Adjust trim gain exact value. gain equation shown below. ((SIG+) (SIG-)) input signal.
Table 3.1: Jumper Selection Choose Gain
Gain 220-1000
Jumper Selection Jumper Jumper Jumper Jumper
potentiometer (P1) becomes more critical gain increased. gain range 1000 entirely decided When turned completely counter-clock-wise, Gain will close 220. When turned completely clock-wise, Gain will greater than 1000.
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Gain Equation
GAIN Vout ((SIG+) (SIG-))
Sensors that incorporate bridge circuitry usually have noticeable zero offsets. This should considered when taking measurements determining gain. easiest solve this problem calibrate system while avoiding zero inputs, correct zero offset software. Example: 10lb. load cell needs calibrated, suggested method following: Make required connections. Place 1lb. mass load cell. Record voltage DB25 Vouta. SDAXX modules. second 1lb. mass onto load cell. Record voltage DB-25 Voutb. Subtract Vouta form Voutb. difference voltage, Vout, which corresponds 1lb. Calculate what ((SIG+) (SIG-)) 1lb. This voltage produced sensor. Gain Equation calculate exact gain amplifier. Adjust repeat process until desired gain achieved. Subtract Vouta from Vout. difference zero offset error. zero offset error should included equation conversion equation used your software.
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105
Chapter Excitation Voltage
Sensors that based Wheatstone bridge need excitation voltage excite bridge. FBDA provides adjustable excitation voltage. This excitation voltage available terminal block labeled EXV. excitation voltage 5VDC 0.05VDC factory. This voltage referenced with respect GND. adjust excitation voltage, following steps should followed: Remove cover from FBDA module using small slotted screwdriver. Make required connections except sensor connections turn power. Using voltmeter, measure voltage terminal block labeled with respect terminal block. Adjust change excitation voltage. terminal block labeled used measure excitation voltage. Sensors that comprised Wheatstone bridges usually state amount output volt excitation voltage. example 10mV output excitation. excitation voltage used, full scale output sensor will 50mV. gain FBDA should then chosen, that Vout does exceed (the maximum voltage that SDAXX line data acquisition modules measure). some reason excitation voltage source FBDA does meet your needs, external excitation voltage. this case, then nothing should connected terminal block, lead external excitation voltage source should connected terminal block FBDA module.
Documentation Number FBDA0797 Manual Electronics 1040 Ottawa, 61350 (815) 433-5100 (815) 433-5105

Strain Gauge/Load Cell Bridge Amplifier Model FBDA Documenta

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