Frequency Response Rugged, Compact Fully Encapsulated Complete System-

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Model Bridgesensor
Frequency Response Rugged, Compact Fully Encapsulated Complete System-just Power Ready With Screwdriver Wiring Stable Accurate
Applications
Weighing With Load Cells Long Term Structural Monitoring Process Control Pressure Transducers Strain Measurements
Description
Model Bridgesensor self contained, powered, signal conditioning module bridge type instrumentation. contains precision differential instrumentation amplifier with filtered output highly regulated, noise, adjustable output bridge excitation source. unit completely encapsulated rugged environments. output filter cutoff frequency 2000Hz lowered adding external capacitors.
Simplified Block Diagram
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001
Model Bridgesensor
Specifications
(Typical 25°C unless noted)
Amplifier Gain Range Gain Temperature Coefficient Gain Potentiometer Hysteresis Drift (RTI) Input Bias Current Input Impedance Differential Common Mode Output Noise (RTO) Input Noise Line Frequencies Output Offset Tare Range Drift Common Mode Rejection Gain Gain Rated Output load) Output Impedance Dynamic Response pole Bessel Filter Common Mode Input Voltage Bridge Supply Input
Getting Started with Model
ppm/°C 0.2% span max. µV/°C 3,000 megohms megohms
Hook Procedure Connect your load cell INPUT, Connect your load cell INPUT,
Note:
SENSE used your load cell application, connections step need followed. SENSE going used, jumper them described steps
±0.2 mV/°C ±10V 0.01 ohms
Connect excitation your load cell jumper SENSE, Connect excitation your load cell jumper SENSE, Connect power supply input lines, pins Turn Procedure Verify that hook procedure complete. Verify correct voltage applied 460; i.e. 100, 115, 220, 230. Turn source supply 460. required EXCITATION supply voltage load cell adjusting ADJUST. III. Calibration Procedure Zero Voltage Adjustment Jumper input terminals, pins together. Connect volt meter across output, pins Adjust COARSE OFFSET FINE OFFSET potentiometers desired ZERO voltage. Full Scale Voltage Adjustment Remove jumper between input terminals apply known load your load cell, most cases would 100% full scale.
±6.5V
±10% (100, available) Output Voltage Volts Output Current (see output voltage current curve) Load Line Regulation 0.05% VOUT 12V, Output Noise Drift ppm/°C max. Potentiometer Hysteresis 0.3% output max. Short Circuit Current Line Isolation 1,500 Mechanical Operating Temperature 70°C Storage Temperature -25°C +85°C Weight (510 grams) 3.75"L 2.0"W 2.87"H Size 9.53 7.62 (cm)
Adjust COARSE GAIN FINE GAIN potentiometers desired FULL SCALE output. Calibration complete. However, user should recheck ZERO FULL SCALE voltage output before continuing.
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001
Model Bridgesensor
FIGURE Typical Bridge Application
Transducer Excitation
Transducer bridge excitation provided line powered, adjustable, well regulated, noise power supply. excitation voltage adjustable means molded-in potentiometer which allows output voltage varied from Volts. output ripple extremely line load regulation 0.05%. sense lines minimize variations output voltage with changes load current lead resistance. should noted that sense feature being used, terminal must connected terminal Terminals must connected also. supply will provide output current. These features make unit ideal most common strain gage bridge circuits 120, 350, Ohms. supply short circuit protection protect against short term faults. output recovers automatically from short circuit conditions once short removed.
VOLTAGE LOAD CURRENT
Safe Operating Unsafe Area
curve (Figure describes region safe operating output current each voltage setting level. excitation desired Volt level with 120mA, this accomplished using resistor least watts size series with bridge. right value resistor would drop Volts allowing Volts 120mA across bridge while minimizing internal heating Model 460. sense line would regulate supply required Volts. Normal operation single bridges Volts under 100mA (all 125, 350, bridges) accomplished within safe operating area.
Instrumentation Amplifier
built-in amplifier true differential input, noise, drift, instrumentation amplifier. high common mode rejection ratio (CMRR) provided with output offset that potentiometer adjustable. minimum gain setting amplifier maximum gain 250. amplifier withstand input voltages Volts without damage. output amplifier filtered down 2kHz using double pole Bessel response filter. output amplifier Volts making compatible with modern data acquisition techniques systems. Capacitors added terminals lower filter cutoff frequency. This will reduce output noise system noise where high frequency response required.
VOLTAGE
BRIDGE SUPPLY
SAFE OPERATING AREA
LOAD CURRENT
FIGURE Safe Operating Curve
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001
Model Bridgesensor
Typical Bridge Application
Figure shows typical bridge application using standard bridge. This could strain gage, load cell, pressure transducer, accelerometer, other bridge based measurement. Typical bridge output mV/Volt excitation. With power supply excitation voltage Volts output from bridge obtained. common mode voltage bridge (the instrumentation amplifier input signal level) Volts. This well within Volt common mode voltage range amplifier. built-in potentiometer gain would achieve output voltage Volts. Assuming standard bridge used, current required from excitation supply (set Volts) would 28.6mA. leads were long enough have Ohms internal resistance there would drop over 0.286 Volts both plus common side bridge. eliminate this potential error (especially where current might vary during course measurement) sense lines connected measure regulate voltage right bridge rather than output supply. decision sense leads depends entirely lead length, resistance, effect that error measurement.
Filter Frequency 2000 Hertz Hertz Hertz Hertz None 0.068 0.68 None 0.022 0.22 0.47
FIGURE Filter Roll Frequency
Application Suggestions
Model designed eliminate many ordinary problems associated with bridge type measurements. Since whole system case common problem ground loops circulating currents caused poor wiring practices eliminated. recommended that lead lengths kept minimum. shielded twisted pairs input leads recommended most applications. minimize self heating errors minimum excitation power suggested sufficient heatsinking transducer whenever possible. optimum stability hour warmup recommended. Avoid large temperature changes stray magnetic fields. Model Bridgesensor ready wire into your system, have power applied, start making measurements you.
Filter Roll Frequency
table Figure shows values filter frequency. printed circuit board included convenient mounting capacitors. ceramic foil type capacitors.
FIGURE Case Dimension
Terminal Strip Assignments Screw Terminal Function -SENSE B+SENSE USED Screw Terminal Function +INPUT -INPUT AMPLIFIER AMPLIFIER OUTPUT FILTER FILTER
Mechanical Specifications
Specifically designed rugged field Model completely encapsulated epoxy using vacuum potting system insure complete seal against corrosive environments. similarly protected against shock vibration will provide years reliable accurate operation.
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001

Frequency Response Rugged, Compact Fully Encapsulated Complete System-

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