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Narrow Bandwidth Strain Gage Input 3B16
FEATURES
Interfaces, amplifies, & filters signals from 4-arm full-bridge strain-gage bridges with a resistance from 300 to 1 k. Module provides a constant +10V bridge excitation voltage. Module provides simultaneous precision voltage and current outputs. Module circuitry can withstand 130v rms at the input screwterminals All 3B16 series modules are mix-and-match and Hot Swappable
Figure 1. 3B16 Functional Block Diagram
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
Industrial signal conditioning Industrial signal isolation Industrial signal filtering
Output modules accept 0 to +10V (or +10V) single-ended signals and provide an isolated 4-20 mA (or 0-20 mA) process signal. All modules feature a universal pin-out and may be readily hot-swapped under full power and interchanged without disrupting field wiring. The Analog Devices 3B Series Signal Conditioning Subsystem is designed to easily handle signal conditioning problems in measurement and control applications. Some typical uses are in microcomputer-based data acquisition systems, programmable controllers, analog recorders, dedicated control systems, and any other applications where monitoring of temperature, pressure, flow and analog signals are required. Since each input module features two simultaneous outputs, the voltage output can be used to provide an input to a microprocessor-based data acquisition or control system while the current output can be used for analog transmission, operator interface, or an analog backup system. Each input module is a single-channel signal conditioner which plugs into a socket on the backplane and accepts its signal from the input screw terminals. All input modules provide input protection, amplification and filtering of the input signal, accuracy of +0.1%, low drift of +1 uV/ oC (low-level input modules), and feature two high-level analog outputs that are compatible with most process instrumentation. The isolated input modules also provide +1500 V peak isolation. The choice of a specific 3B module depends upon the type of input signal. Input modules are available to accept millivolt, volt, process current, thermocouple, RTD, AC and DC strain gage, frequency and LVDT inputs. The voltage output of each module is available from the system I/O connector while the current output is available on the output screw terminals.
PRODUCT OVERVIEW
The 3B Series of Signal Conditioning I/o Subsystems provide a low-cost, versatile method of transferring analog transducer signals to a data acquisition, monitoring or control system without the inherent noise, non-linearity, drift and extraneous voltages. The modules are designed to directly accept analog signals from Thermocouples, RTD's, AC and DC Strain Gages, Torque Transducers, Frequency Transducers, LVDTs, millivolt or process current signals. The modules amplify, isolate, linearize and convert the transducer output signals to standardized analog inputs for high-level analog I/O subsystems. The 3B Series Subsystem consists of a 10" relay rack with universal mounting backplane and a family of plug-in (up to 16 per rack) input and output signal conditioning modules. Eight and four channel backplanes are also available. Each backplane incorporates screw terminals for sensor inputs and current outputs and a 26-pin connector for high-level singleended voltage outputs to the user's equipment. The input modules feature complete signal conditioning circuitry optimized for specific sensors or analog signals and provide two simultaneous high-level analog outputs: 0 to +10V (or +10V) and 4-20 mA (or 0-20 mA).
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
3B16 GENERAL DESCRIPTION
The 3B16 is a single-channel signal conditioning module which interfaces, amplifies, and filters signals from 4-arm full-bridge strain-gage bridges with a resistance from 300W to 1kW. The module provides a constant +10V bridge excitation voltage and provides simultaneous precision voltage and current outputs. The user-configurable Model 3B16-00 can be applied in applications involving large tare weights which must be compensated with zero suppression. The 3B16 protects the computer side from damage due to field-side over-voltage faults up to 130V rms. In addition, the current output withstands 130V rms without damage and interfaces user equipment through screw terminals located on the 3B Series backplane. The 3B16 is a plug-in, mix-and-match, hot-swappable module which is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs. 3B Series Custom-Ranging Program - Externallyprogrammable Model 3B16-00, enables the user to configure a special input range, including tare weight suppression, by using the optional plug-on AC1310 ranging card, which houses usersupplied resistors to determine zero and span. To facilitate . selecting resistors, a Windows program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges. A chopper-stabilized low-drift (+1uV/oC) input amplifier assures long-term stability. At the amplifier input, a stable, zeroscale input voltage is subtracted from the input signal to set the zero-scale value. Zero suppression can exceed 100% of the input range. This is ideal for expanded-scale applications requiring high-resolution measurement of a selected portion of an input signal. For user convenience, the zero and span can be factory configured to meet custom range needs (Model 3B16CUSTOM) or can be externally programmed (Model 3B16-00) via user supplied resistors inserted in the optional AC1310 plugon ranging card. Internal low-pass filtering with a 3 Hz cutoff (-3dB) two-pole Butterworth filter enhances a 60 dB normalmode rejection at 50/60 Hz, enabling accurate measurement of small signals in high electrical noise.
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Figure 2
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3B16
3B16 Models Available
Model 3B16-00 3B16-01 3B16-CUSTOM
1 2
Input Bridge Full Bridge Full Bridge Full Bridge
Input Range Externally Programmable2 -30 mV to +30 mV *
Excitation +10 V +10 V +10 V
Sensitivity Externally Programmable2 3 mV/V *
Output Ranges1 -10 V to +10 V & 0 mA to 20 mA -10 V to +10 V & 0 mA to 20 mA *
Output current range may be user programmed to 4 mA to 20 mA using jumper supplied. Requires AC1310 ranging card. * Custom Input/Output ranges are available. Refer to configuration guide.
3B16 Specifications (typical @ +25C and 15 V dc, and +24 V dc Power)
Description Input Range Standard Range Custom Ranges 30 mV (3 mV/V sensitivity @ Vexc = +10V) 5 mV to 500 mV Output Range Voltage (RL > 2 K) Current (RL = 0 to 850)1 Maximum Current Output Span -10 V to +10 V 4 mA to 20 mA or 0 mA to 20 mA 0 mA to 31 mA Accuracy2 Initial @ +25C Nonlinearity2 0.1% Span 0.01% Span Stability vs. Temperature Voltage Output Zero Span Current Output Zero Span
3
Model 3B16
3 V/C (RTI) 25 ppm of Reading/C
25 ppm of Span/C 25 ppm of Reading/C
Bridge Excitation Voltage Voltage, tolerance Voltage vs. Temperature +10 V 2% 0.0015%/C Bridge Resistance Range Rev. 0 | Page 3 of 8
3B16
Vexc= +10.0 V Zero and Span Adjustment Range Input Bias Current Input Resistance
4
300 to 1 k 5% of Span +3 nA 100 M Noise
Input, 0.1 Hz to 10 Hz Bandwidth Output, 100 kHz Bandwidth Bandwidth, -3 dB Output Rise Time, 10% to 90% Span
0.2 V rms 50 V rms 3 Hz 200 ms Common-Mode Voltage (CMV)
Input-to-Output, Continuous Transient Normal Mode Rejection @ 50/60 Hz
10 V peak, maximum ANSI/IEEE C37.90.1-1989 60 dB Input Protection, Signal and Excitation Voltage
Continuous Trasient Voltage Output Protection Current Output Protection
130 V rms maximum ANSI/IEEE C37.90.1-1989 Continuous Short to Ground 130 V rms, continuous Power Supply Voltages 5
15 V dc Supplies Rated Operation Current Sensitivity +24 V dc Loop Supply Rated Operation Current Sensitivity Mechanical Dimensions +12 V dc to +30 V dc +27 mA @ lout = 20 mA 0.0002% span/V 3.15" x 3.395" x 0.775" 80.0 mm x 86.2 mm x 19.7 mm) Environmental Temperature Range Rated Performance Storage Relative Humidity, 24 hours RFI Susceptibility
1 2 3
(12.7 V dc to 16.5 V dc) +45 mA, -10 mA 0.01% span/V
-25C to +85C -55C to +85C 0 to 95% @ +60C noncondensing 0.5% Span error @ 400 MHz, 5 Watt, 3 ft
For a 0 mA to 20 mA range, a typical minimum output current is 10 A. Includes the combined effects of repeatability, hysteresis, and nonlinearity. With respect to the voltage output. 4 A wide range of custom zero suppression and span is available with the 3B16-00 model, using the AC1310 ranging card. 5 +24 V dc loop power is required for driving the current output at loads up to 850. If a current output load of 400 or less is applied, +15 V dc is sufficient for loop power. If only voltage output is used, loop power is not required. Specifications subject to change without notice.
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3B16 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 3B16 Input Field Connections
Table 1. Pin Function Descriptions--
Pin No. 1 2 3 4 Description +EXC HI LO -EXC
Figure 4 . Model 3B Series Module, with pin-out assignments.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
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3B16 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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3B16 NOTES
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3B16 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05104-0-9/04(0)
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