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3B20-01
Non-Isolated AC Strain or Torque Input Signal Conditioning Module
AC Strain Gage, Torque Transducer InputRev. 0
FEATURES
Interfaces, amplifies, & filters signals from 4-arm AC bridge
transducer signals ranging between 1.5mV rms & 150mV
rms.
Module provides an AC excitation voltage of 2V rms to 10V
rms at frequencies between 1kHz & 10kHz..
Module provides simultaneous precision voltage and
current outputs.
Module circuitry can withstand 130v rms at its current
output terminals without damage.
All 3B20 series modules are mix-and-match and Hot
Swappable
APPLICATIONS
Industrial signal conditioning
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 single-
ended 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).
FUNCTIONAL BLOCK DIAGRAM Figure 1. 3B20 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 +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.
GENERAL DESCRIPTION The 3B20 is a wideband single-channel signal-conditioning
module which interfaces 4-arm AC bridge transducer signals
ranging between 1.5mV rms and 150mV rms, providing
simultaneous precision voltage and current outputs. In addition,
the module provides an AC excitation voltage of 2V rms to 10V
rms at frequencies between 1kHz and 10kHz. The module
withstands 130V rms at its current output terminals without
damage thereby shielding computer-side circuitry from field-
side over-voltage conditions. The 3B20 is a plug-in, mix-and-
match, hot-swappable module and is easily field calibrated via
front-panel zero and span adjustments for both voltage and
current outputs.
3B Series Custom-Ranging Program – Externally-
programmable Model 3B20-00, enables the user to configure a
special input range, including tare weight suppression, by using
the optional plug-on AC1310 ranging card, which houses user-
supplied 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.
The 3B20 input and AC bridge excitation output terminals are
protected for up to 130V rms. The excitation amplitude and
frequency can be specified with the Model 3B20 CUSTOM or
user configured with Model 3B20-00 and an optional plug-on
Model AC1310 ranging card. Both the voltage and current
outputs can be independently adjusted for a minimum of +1V
for the zero and 25% of the span range with front-panel user-
accessible potentiometers. In addition, phase shifts of up to
37.25o between excitation signal and the output signal from the
strain gauge or torque transducer can be compensated via front-
panel screw terminal adjustments.
.
.
Figure 2
3B20 Models Available
Model Excitation Voltage Excitation Frequency Input Range Sensitivity Output Ranges1
3B20-00 Externally
Programmable2
Externally
Programmable2
Externally
Programmable2
Externally
Programmable2
-10 V to +10 V &
0 mA to 20 mA
3B20-01 5 V rms 3 kHz 20 mV rms 2 mV rms/V -10 V to +10 V &
0 mA to 20 mA
3B20-Custom * * * * * 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.
3B20 Specifications
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
Description Model 3B20
Input Range
Standard Range Refer to Model Table
Custom Ranges Vin = 1.5 mV rms to 150 mV rms
Vexc = 2 V rms to 10 V rms
Vexc freq. = 1 kHz to 10 kHz
Output Range
Voltage (RL > 2 KΩ) -10 V to +10 V
Current (RL = 0 to 850Ω)1 4 mA to 20 mA or 0 mA to 20 mA
With Input Overload 40 mA, maximum
Accuracy2
Initial @ +25°C ±0.1% Span
Nonlinearity2 ±0.05% Span
Stability vs. Temperature
Voltage Output
Zero ±0.005% of Span/°C
Span ±0.01% of Span/°C
Current Output3
Zero ±25 ppm of Span/°C
Span ±25 ppm of Reading/°C
Bridge Excitation
Voltage4 2 V rms to 10 V rms
Voltage, tolerance ±2.5%
Frequency4 1 kHz to 10 kHz, ±15%
Drive Up to 20 mA rms, minimum
Zero Calibration Adjustment Range4 ±1 V, minimum
Phase Adjustment Range5 0 to 4.25° minimum @ 1 kHz 0 to 14° minimum @ 3.28 kHz
0 to 37.25° minimum @ 10 kHz
Input Bias Current +10 nA
Input Resistance 100 MΩ
Bandwidth, -3 dB 100 Hz
Output Rise Time, 10% to 90% Span 200 ms
Input Protection, Signal and Excitation Voltage
Continuous 130 V rms maximum
Transient ANSI/IEEE C37.90.1-1989
Voltage Output Protection Continuous Short to Ground
Current Output Protection 130 V rms, continuous
Power Supply Voltages 5
±15 V dc Supplies
Rated Operation ±(13 V dc to 18 V dc)
Current ±65 mA
Sensitivity ±0.03% span/V
+24 V dc Loop Supply
Rated Operation +13.5 V dc to +30 V dc
Current +27 mA @ lout = 20 mA
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. 3 With respect to the voltage output. A wide range of custom zero suppression and span is available with the 3B20-00 model, using the AC1310 ranging card. +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.
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 3B20 Input Field Connections
Table 1. Pin Function Descriptions—
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.
OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
