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.
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 screw-
All 3B17 series modules are mix-and-match and Hot
Industrial signal isolation
Industrial signal filtering
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
backplane incorporates screw terminals for sensor inputs and
current outputs and a 26-pin connector for high-level single-
ended voltage outputs to the user's equipment.
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).
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.
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
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/
compatible with most process instrumentation. The isolated
input modules also provide +1500 V peak isolation.
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.
conditioning 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 user-
calibrated 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.
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
selecting resistors, a Windows program, 3B-CUSTOM,
calculates resistor values based on the user-desired input/output
ranges and AC excitation.
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.
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
Voltage and Frequency
80.0 mm x 86.2 mm x 19.7 mm)
Specifications subject to change without notice.
Table 1. Pin Function Descriptions--
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.