Isolated AC Sine Wave Input
3B42 / 3B43 / 3B44
FEATURES
AC averaging technique used to rectify, amplify, and filter 50
Hz to 400 Hz sine-wave signals.
Accepts inputs of between 20 mV to 550 V rms to give an rms
output reading.
Module provides simultaneous precision voltage and
current outputs.
Module circuitry can withstand 130v rms at the input screw-
terminals.
All 3B42, 3B43, & 3B44 series modules are mix-and-match
and Hot Swappable.
FUNCTIONAL BLOCK DIAGRAM
Figure 1. 3B42, 3B43, & 3B44 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/
o
C (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 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).
Rev. 0
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
© 2004 Analog Devices, Inc. All rights reserved.
3B42 / 3B43 / 3B44
GENERAL DESCRIPTION
The 3B42, 3B43, and 3B44 are single-channel AC sine wave
signal conditioning modules which use an AC averaging
technique to rectify, amplify, and filter 50 Hz to 400 Hz sine-
wave signals ranging from 20 mV to 550 V rms to give an rms
output reading. Simultaneous precision voltage and current
outputs are provided including isolation (+1500 V peak input-
to-output and power). The 3B42 and 3B43 modules withstand
220 V rms, and Model 3B44 withstands 550 V rms at its input
terminals without damage, thereby shielding computer-side
circuitry from field-side over-voltage conditions. Each plug-in,
mix-and-match, hot-swappable module is easily field calibrated
via front-panel zero and span adjustments for both voltage and
current outputs.
3B Series Custom-Ranging Program – Externally-
.
programmable versions, Models 3B42-00, 3B43-00, and 3B44-
00, enable the user to configure a special input range 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.
Signal isolation by transformer coupling uses a proprietary
modulation technique for linear, stable and reliable
performance. The differential input circuit on the field side is
fully floating, eliminating the need for any input grounding. A
demodulator on the computer side of the signal transformer
recovers the original signal, which is then filtered and buffered
to provide a low-noise, low-impedance output signal.
.
Figure 2
Rev. 0 | Page 2 of 8
3B42 / 3B43 / 3B44
3B42, 3B43 and 3B44 Models Available
Model
3B42-00
3B42-01
3B42-02
3B42-Custom
Model
3B43-00
3B43-01
3B43-Custom
Model
3B44-00
3B44-01
3B44-02
3B44-Custom
1
2
Input Range
Externally Programmable
2
0 mV to +50 mV rms
0 mV to +100 mV rms
*
Input Range
Externally Programmable
2
0 V to +10 V rms
*
Input Range
Externally Programmable
2
0 V to +150 V rms
0 V to +250 V rms
*
Output Ranges
1
0 V to +10 V & 0 mA to 20 mA
0 V to +10 V & 0 mA to 20 mA
0 V to +10 V & 0 mA to 20 mA
*
Output Ranges
1
0 V to +10 V & 0 mA to 20 mA
0 V to +10 V & 0 mA to 20 mA
*
Output Ranges
1
0 V to +10 V & 0 mA to 20 mA
0 V to +10 V & 0 mA to 20 mA
0 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.
3B42, 3B43 and 3B44 Specifications
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
Description
Model 3B42
Input Ranges
Standard Ranges, 50 Hz to 400 Hz
Custom Ranges, 50 Hz to 400 Hz
Refer to Model Table
20 mV rms to 1 V rms
Output Ranges
Voltage (R
L
> 2 kΩ)
Current (R
L
+ 0 to 850
Ω)
1
0 V to +10 V
4 mA to 20 mA or 0 mA to 20 mA
Accuracy
2
Initial @ +25°C
Nonlinearity
±0.05% Span
±0.02% Span
Stability vs. Temperature
Voltage Output
Zero
Span
Current Output
3
Zero
Span
Zero and Span Adjustment Range
4
±25 ppm of Span/°C
±25 ppm of Reading/°C
±5% of Span
*
*
*
*
*
*
±0.005% of Span/°C
±0.005% of Reading/°C
*
*
*
*
*
*
*
*
*
*
*
*
Refer to Model Table
1 V rms to 50 V rms
Refer to Model Table
50 V rms to 550 V rms
Model 3B43
Model 3B44
Rev. 0 | Page 3 of 8
3B42 / 3B43 / 3B44
Input Bias Current
Input Resistance
+1 nA
100 MΩ
Noise
Input, 0.1 Hz to 10 Hz Bandwidth
Output, Ripple and Noise
Bandwidth, -3 dB
Output Rise Time, 10% to 90% Span
5 µV rms
50 µV rms
3 Hz
200 ms
Common-Mode Voltage (CMV)
Input-to-Output, Continuous
Transient
±1500 V peak, maximum
ANSI/IEEE C37.90.1-1989
Common Mode Rejection (CMR)
1 kΩ Source Imbalance, 50/60 Hz
100 dB
Input Protection
Continuous
Transient
Voltage Output Protection
Current Output Protection
220 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 @ l
out
= 20 mA
±0.0002% span/V
3.15" x 3.395" x 0.775"
(80.0 mm x 86.2 mm x 19mm)
Environmental
Temperature Range
Rated Performance
Storage
Relative Humidity, 24 hours
RFI Susceptibility
-25°C to +85°C
-55°C to +85°C
0 to 95% @ +60°C non-
condensing
±0.5% Span error @ 400 MHz,
5 Watt, 3 ft
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
±(11.5 V dc to 16.5 V dc)
±10 mA
±0.01% span/V
*
*
*
*
*
*
*
*
*
*
550 V rms, continous
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
+5 nA
250 kΩ
+3 nA
1 MΩ
* Specifications same as model 3B42.
1
For a 0 to 20 mA range, a typical minimum output current is 10 µA.
2
Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3
With respect to the voltage output.
4
A wide range of custom zero suppression and span is available with Models 3B42-00, 3B43-00 and 3B44-00, using the AC1310 ranging card.
5
+24 V dc loop power is required for driving the current output at loads up to 850
Ω
. If a current output load of 400
Ω
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. .Bottom
of Form
Rev. 0 | Page 4 of 8
3B42 / 3B43 / 3B44
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 3B42, 3B43, & 3B44 Input Field Connections
Table 1. Pin Function Descriptions—
Pin No.
1
2
3
4
Description
N/C
HI
LO
N/C
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.
Rev. 0 | Page 5 of 8
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