Datasheet 3B17 Datasheet (Analog Devices)

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Wide Bandwidth LVDT/RVDT Input

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.

APPLICATIONS

Industrial signal amplification Industrial signal isolation Industrial signal filtering

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

10V) and 4-20 mA (or 0-20 mA).

(or +

3B17

FUNCTIONAL BLOCK DIAGRAM

Figure 1. 3B17 Functional Block Diagram

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 + modules), and feature two high-level analog outputs that are compatible with most process instrumentation. The isolated input modules also provide +

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.

0.1%, low drift of +1 uV/oC (low-level input

1500 V peak isolation.

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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.

www.analog.com

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 + center setting. The current output can be independently adjusted over a + 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

5% range for zero and span. In addition, the

5V from the

3B17

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.

Figure 2

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3B17 Models Available

Model Excitation Voltage Excitation Frequency Output Ranges1

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

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.

Externally Programmable2 Externally Programmable2 -10 V to +10 V & 0 mA to 20 mA

3 V rms 2.5 kHz -10 V to +10 V & 0 mA to 20 mA 5 V rms 5 kHz -10 V to +10 V & 0 mA to 20 mA 5 V rms 7.5 kHz -10 V to +10 V & 0 mA to 20 mA 1 V rms 10 kHz -10.0 V to +10 V & 0 mA to 20 mA

* * *

Externally Programmable2 Externally Programmable2 -10 V to +10 V & 0 mA to 20 mA

3 V rms 2.5 kHz -10 V to +10 V & 0 mA to 20 mA 5 V rms 5 kHz -10 V to +10 V & 0 mA to 20 mA 5 V rms 7.5 kHz -10 V to +10 V & 0 mA to 20 mA 1 V rms 10 kHz -10 V to +10 V & 0 mA to 20 mA

3B17

3B17 Specifications (typical @ +25°C and ±15 V dc, and +24 V dc Power)

Description Model 3B17

Input Range

Types 4-, 5-, 6-wire LVDT or RVDT, including differential coils Standard Range 20 mV rms to 5 V rms; See Model Table for Excitation

Custom Excitation V

Voltage (R Current (RL = 0 to 850Ω)1 With Input Overload 40 mA, maximum

Initial @ +25°C ±0.1% Span Nonlinearity2 ±0.05% Span

Voltage Output Zero ±0.005% of Span/°C Span ±0.01% of Span/°C Current Output Zero ±25 ppm of Span/°C Span ±25 ppm of Reading/°C

> 2 KΩ)

Voltage and Frequency

= 1 V rms to 5 V rms

exc

freq. = 1 kHz to 10 kHz

exc

Output Range

-10 V to +10 V 4 mA to 20 mA or 0 mA to 20 mA

Accuracy2

Stability vs. Temperature

LVDT Excitation4

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3B17

Voltage 1 V rms to 5 V rms Voltage, tol er an ce ±10% Frequency 1 kHz to 10 kHz, ±15% Drive 20 mA rms, minimum Harmonic Distortion < 0.5%

Voltage Output Calibration4

Span Adjus tment Range 256:1 Zero Adjustment Range ±5 V

Current Output Calibration4

Zero and Span Adjustment Range ±5% of Span

Input Bias Current Input Resistance Bandwidth5, -3 dB Output Rise Time, 10% to 90% Span

+1 µA 100 MΩ 100 Hz 5 ms

Input Protection, Signal and Excitation Voltage

Continuous 130 V rms maximum Transient ANSI/IEEE C37.90.1-1989

Voltage Output Protection Current Output Protection

Continuous Short to Ground

130 V rms, continuous

±15 V dc Supplies

Rated Operation ±(13 V dc to 18 V dc) Current ±65 mA plus LVDT Current7 Sensitivity ±0.03% span/V +24 V dc Loop Supply Rated Operation +13.5 V dc to +30 V dc Current +27 mA @ l

= 20 mA

out

Sensitivity ±0.001% span/V Mechanical Dimensions

3.15" x 3.395" x 0.775"

80.0 mm x 86.2 mm x 19.7 mm)

Environmental

Temperature Range Rated Performance -25°C to +85°C Storage -55°C to +85°C Relative Humidity, 24 hours 0 to 95% @ +60°C non-condensing RFI Susceptibility ±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 µA.

Includes the combined effects of repeatability, hysteresis, and nonlinearity.

With respect to the voltage output.

A wide range of custom zero suppression and span is available with the 3B17-00 model, using the AC1310 ranging card.

Bandwidth can be set for up to 1/10 the excitation frequency when ordering Model 3B17-custom.

+24 V dc loop power is required for driving the current output at loads up to 850Ω. If a current output load of 400Ω or less is applied, +15 V dc is sufficient for loop power. If only

voltage output is used, loop power is not required.

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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PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

Table 1. Pin Function Descriptions—

Pin No. Description

1 LO IN 2 CJC OUT 3 HI IN 4 CJC COM

3B17

Figure 3 3B17 Input Field Connections

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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