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Wide Bandwidth LVDT/RVDT Input 3B17
FEATURES
Isolates, amplifies, & filters signals from 4-, 5, or 6-wire Linear Variable Displacement Transformers (LVDTs). Isolates, amplifies, & filters signals from Rotary Variable Displacement Transformers (RVDT). Provides an AC excitation voltage of 1V rms to 5V rms at frequencies between 1 kHz and 10kHz. Module circuitry can withstand 130v rms at the input screwterminals. All 3B17 series modules are mix-and-match and Hot Swappable.
Figure 1. 3B17 Functional Block Diagram
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
Industrial signal amplification 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.
3B17 GENERAL DESCRIPTION
The 3B17 is a wide-bandwidth single-channel signalconditioning module which isolates, amplifies, and filters signals from 4-, 5-, or 6-wire Linear Variable Displacement Transformers (LVDTs) or Rotary Variable Displacement Transformers (RVDT). The 3B17 input module provides an AC excitation voltage of 1V rms to 5V rms at frequencies between 1 kHz and 10 kHz. All gain and zero suppression can be usercalibrated by screwdriver adjustments through the sliding door on the top of the module. Gain can vary over an extensive 256:1 range by adjusting a combination of a rotary switch and trim potentiometer. Zero suppression can vary over +5V from the center setting. The current output can be independently adjusted over a +5% range for zero and span. In addition, the 3B17 is mix-and-match and hot-swappable with all 3B Series modules, so it can be inserted or removed from any socket in the same backplane without disrupting system power. 3B Series Custom-Ranging Program - Externallyprogrammable Model 3B17-00, and 3B17-D-00, enable the user to configure a special input range, excitation voltage and excitation frequency by using the optional plug-on AC1310 ranging card, which houses user-supplied resistors to determine . excitation voltage amplitude and frequency. To facilitate selecting resistors, a Windows program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges and AC excitation. The 3B17 input and AC excitation output terminals are protected for up to 130V rms, protecting the computer side from damage due to field-side over-voltage faults. The LVDT input signal is amplified to give the high level output voltage. The 3B17 automatically compensates for phase errors between the primary and secondary of the LVDT or RVDT, eliminating the need for a phase adjustment and automatically rejects any residual quadrature voltages via a unique approach to error compensation which uses the sum of the two secondary winding to directly drive the demodulator. The amplitude and frequency of the AC excitation can be factory configured to meet custom needs (Model 3B17-Custom) or externally configured (Models 3B17-00 and 3B17-D-00) with the optional AC1310 plug-on custom ranging card.
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Figure 2
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3B17
3B17 Models Available
Model 3B17-00 3B17-01 3B17-02 3B17-03 3B17-04 3B17-Custom 3B17-D-00 3B17-D-01 3B17-D-02 3B17-D-03 3B17-D-04
1 2
Excitation Voltage Externally Programmable2 3 V rms 5 V rms 5 V rms 1 V rms * Externally Programmable 3 V rms 5 V rms 5 V rms 1 V rms
2
Excitation Frequency Externally Programmable2 2.5 kHz 5 kHz 7.5 kHz 10 kHz * Externally Programmable 2.5 kHz 5 kHz 7.5 kHz 10 kHz
2
Output Ranges1 -10 V to +10 V & 0 mA to 20 mA -10 V to +10 V & 0 mA to 20 mA -10 V to +10 V & 0 mA to 20 mA -10 V to +10 V & 0 mA to 20 mA -10.0 V to +10 V & 0 mA to 20 mA * -10 V to +10 V & 0 mA to 20 mA -10 V to +10 V & 0 mA to 20 mA -10 V to +10 V & 0 mA to 20 mA -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.
3B17 Specifications (typical @ +25C and 15 V dc, and +24 V dc Power)
Description Input Range Types Standard Range Custom Excitation 4-, 5-, 6-wire LVDT or RVDT, including differential coils 20 mV rms to 5 V rms; See Model Table for Excitation Voltage and Frequency Vexc = 1 V rms to 5 V rms Vexc freq. = 1 kHz to 10 kHz Output Range Voltage (RL > 2 K) Current (RL = 0 to 850)1 With Input Overload -10 V to +10 V 4 mA to 20 mA or 0 mA to 20 mA 40 mA, maximum Accuracy2 Initial @ +25C Nonlinearity
2
Model 3B17
0.1% Span 0.05% Span Stability vs. Temperature
Voltage Output Zero Span Current Output Zero Span
3
0.005% of Span/C 0.01% of Span/C
25 ppm of Span/C 25 ppm of Reading/C LVDT Excitation4
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3B17
Voltage Voltage, tolerance Frequency Drive Harmonic Distortion 1 V rms to 5 V rms 10% 1 kHz to 10 kHz, 15% 20 mA rms, minimum < 0.5% Voltage Output Calibration4 Span Adjustment Range Zero Adjustment Range 256:1 5 V Current Output Calibration4 Zero and Span Adjustment Range Input Bias Current Input Resistance Bandwidth , -3 dB Output Rise Time, 10% to 90% Span
5
5% of Span +1 A 100 M 100 Hz 5 ms Input Protection, Signal and Excitation Voltage
Continuous Transient Voltage Output Protection Current Output Protection 15 V dc Supplies Rated Operation Current Sensitivity +24 V dc Loop Supply Rated Operation Current Sensitivity Mechanical Dimensions
130 V rms maximum ANSI/IEEE C37.90.1-1989 Continuous Short to Ground 130 V rms, continuous
(13 V dc to 18 V dc) 65 mA plus LVDT Current7 0.03% span/V
+13.5 V dc to +30 V dc +27 mA @ lout = 20 mA 0.001% 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
-25C to +85C -55C to +85C 0 to 95% @ +60C non-condensing 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 3B17-00 model, using the AC1310 ranging card. 5 Bandwidth can be set for up to 1/10 the excitation frequency when ordering Model 3B17-custom. 6 +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. 7 Typical supply current is 40 mA per module plus 5 mA for the LVDT drive current. To calculate supply current requirements from LVDT currents, use 75% of the LVDT rms current. Specifications subject to change without notice.
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3B17 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Table 1. Pin Function Descriptions--
Pin No. 1 2 3 4 Description LO IN CJC OUT HI IN CJC COM
Figure 4 . Model 3B Series Module, with pin-out assignments. Figure 3 3B17 Input Field Connections
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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3B17 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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3B17 NOTES
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3B17 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05090-0-9/04(0)
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