Analog Devices B42 3 4 Datasheet

Isolated AC Sine Wave Input

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 screw­terminals.

All 3B42, 3B43, & 3B44 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 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 +

3B42 / 3B43 / 3B44

FUNCTIONAL BLOCK DIAGRAM

Figure 1. 3B42, 3B43, & 3B44 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.

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.
Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

www.analog.com

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 sine­wave 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 (+
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-

.

1500 V peak input-

3B42 / 3B43 / 3B44

programmable versions, Models 3B42-00, 3B43-00, and 3B44­00, enable the user to configure a special input range by using
the optional plug-on AC1310 ranging card, which houses user­supplied 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

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3B42, 3B43 and 3B44 Models Available

Model Input Range Output Ranges1

3B42-00
3B42-01
3B42-02

3B42-Custom

Model Input Range Output Ranges1
3B43-00
3B43-01

3B43-Custom

Model Input Range Output Ranges
3B44-00
3B44-01
3B44-02

3B44-Custom

1

Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.

2

Requires AC1310 ranging card.

* Custom Input/Output ranges are available. Refer to configuration guide.

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

0 mV to +50 mV rms 0 V to +10 V & 0 mA to 20 mA

0 mV to +100 mV rms 0 V to +10 V & 0 mA to 20 mA

* *

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

0 V to +10 V rms 0 V to +10 V & 0 mA to 20 mA

* *

Externally Programmable

0 V to +150 V rms 0 V to +10 V & 0 mA to 20 mA
0 V to +250 V rms 0 V to +10 V & 0 mA to 20 mA

* *

3B42 / 3B43 / 3B44

1

2

0 V to +10 V & 0 mA to 20 mA

3B42, 3B43 and 3B44 Specifications

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

Description Model 3B42 Model 3B43 Model 3B44

Input Ranges

Standard Ranges, 50 Hz to 400 Hz Refer to Model Table Refer to Model Table Refer to Model Table
Custom Ranges, 50 Hz to 400 Hz 20 mV rms to 1 V rms 1 V rms to 50 V rms 50 V rms to 550 V rms

Output Ranges

Voltage (R
Current (RL + 0 to 850 Ω)1

Initial @ +25°C ±0.05% Span * *
Nonlinearity ±0.02% Span * *

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

Zero and Span Adjustment Range4

> 2 kΩ)

L

3

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

Accuracy2

Stability vs. Temperature

±5% of Span * *

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