ANALOG DEVICES 5B32 Service Manual

Single-Channel Signal Conditioning Module

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FEATURES

Isolated Current Input.
Amplifies, Protects, Filters, and Isolates Analog Input.
Measure process-current input signal of 4-20 mA or 0-20 mA

by reading the voltage across an external precision 20Ω
resistor (supplied).

Generates an output of 0 to +5V.
Extra Current Conversion resistors are available.
Module circuitry can withstand 240v rms at the input screw-

terminals.
All 5B32 series modules are mix-and-match and Hot

Swappable.

APPLICATIONS

Industrial signal conditioning
Industrial signal isolation
Industrial signal filtering

PRODUCT OVERVIEW

The 5B Series represents an innovative generation of low cost,
high performance plug-in signal conditioners. Designed for
industrial applications, these modules incorporate highly
reliable transformer-based isolation and automated surface­mount manufacturing technology. They are compact,
economical components whose performance exceeds that
available from more expensive devices. Combining 1500 V rms
continuous isolation, +0.05% calibrated accuracy, small size and
low cost, the 5B Series is an attractive alternative to expensive
signal conditioners and in-house designs

All modules are potted and identical in pin-out and size (2.27” x

2.32” x 0.595”). They can be mixed and matched, permitting
users to address their exact needs, and may be “hot swapped
without disturbing field wiring or power. The isolated input
modules provide 0 to +5V or +5V outputs and accept J, K, T, E,
R, S, N, or B type thermocouples.

These modules feature complete signal conditioning functions
including 240 V rms input protection, filtering, chopper
stabilized low drift +1 uV/oC amplification, 1500 V rms
isolation, and sensor excitation when required.

All modules feature excellent common mode rejection and
meet industrial transient surge withstand specifications.

5B32

FUNCTIONAL BLOCK DIAGRAM

Figure 1. 5B32 Functional Block Diagram

There are also a number of backplanes and mounting sockets
which provide a complete signal conditioning solution for end
users. Each backplane incorporates screw terminals for field
wiring inputs and outputs and cold junction sensors for
thermocouple applications.

These signal conditioners are designed to provide an easy and
convenient solution to signal conditioning problems of both
designers and end users in measurement and control
applications. Typical uses include microcomputer-based
measurement systems, standard data acquisition systems,
programmable controllers, analog recorders and dedicated
control systems. The 5 B series modules are ideally suited to
applications where monitoring and control of temperature,
pressure, f low, rotation and other analog signals are required.

The 5B Series modules and backplanes are approved by Factory
Mutual (FM) and the 5B Series modules are approved by the
Canadian Standards Association (CSA) for use in Class 1,
Division 2, Groups A, B, C, and D locations. These approvals
certify that the 5B Series is suitable for use in locations where a
hazardous concentration of flammable gas may exist only under
fault conditions of operation. Equipment of this category is
called “nonincendive” and they need no special enclosures or
other physical safeguards.

The 5B series modules and backplanes have been tested and
passed the stringent heavy industrial requirements of the
European Union’s electromagnetic compatibility (ENC)
directive – EN50082-1 and EN50081-2. When used according
to installation directions (refer to 5B series User Manual), any
errors caused by EMI/RFI interference will be less than 0.1% of
the full scale 5B measurement range for field strengths up to 10
V/M and frequencies up to 1 GHz.

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

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GENERAL DESCRIPTION

The 5B32 is a single-channel signal conditioning module that
amplifies, protects, filters and isolates its analog input. The
module measures a process current input signal of 4-20 mA or
0-20 mA by reading the voltage across an external precision
20W resistor (supplied) and generating an output of 0 to +5 V.
Extra current conversion resistor are available as accessories
(See Model AC1362 in the Accessories section).

Note that the 5B32 module circuitry can withstand 240 V rms at
the input screw-terminals, thereby shielding computer-side
circuitry from field-side overvoltage conditions. In addition, all
5B32 Series modules are mix-and-match and hot swappable, so
can be inserted or removed from any socket in the same
backplane without powering down the system.

A chopper-stabilized input amplifier provides low drift and
stable gain. At the amplifier input, a stable, laser-trimmed zero­scale input offset is subtracted from the input signal to set the

.

5B32

zero-scale value for the 4-20 mA range. For user convenience,
the zero can be optionally factory-set to meet custom needs,
This allows suppression of a zero-scale input value many times
larger than the total span for precise expanded-scale
measurements.

Internal multi-pole lowpass filtering with a four-Hz cutoff (­3dB) enhances normal-mode (noise on signal) and common­mode (noise on signal return) rejection at 50/60 Hz, enabling
accurate measurement of small signals in high electrical noise.

A series output switch eliminates the need for external
multiplexing in many applications. The switch is turned on by
an active-low enable input. If the switch is to be on at all times,
the enable-input should be grounded to power common as it is
on the 5B01 and 5B08 backplanes..

Figure 2

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Rev. 0 | Page 2 of 8

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5B32—SPECIFICATIONS

5B32 Specifications

Description Model 5B32

Input Ranges

Standard Ranges 0 mA to 20 mA or 4 mA to 20 mA

Custom Ranges 0 mA to 20 mA (refer to ordering section)

Output Ranges (RL > 50 kΩ)4

Initial @ +25°C ±0.05% Span ±0.05% Iz1

Nonlinearity ±0.02% Span

Input Offset vs. Temperature ±0.0025 of Iz/°C

Output Offset vs. Temperature ±20 µV/°C

Gain vs. Temperature ±0.0025% of Reading/°C

-5 V to +5 V or 0 V to +5 V

Accuracy2

5B32

Input Resistor5

Value

Accuracy ±0.1%

Stability vs. Temperature ±0.001%/°C

Input, 0.1 Hz to 10 Hz Bandwidth 10 nA rms

Output, 100 kHz Bandwidth 200 µV rms

Bandwidth, -3 dB 4 Hz

Output Rise Time, 10% to 90% Span 200 ms

Common-Mode Voltage (CMV)3

Input-to-Output, Continuous 1500 V rms maximum

Output-to-Power, Continuous ±3 V maximum

Transient ANSI/IEEE C37.90.1-1989

Common Mode Rejection (CMR)

1 kΩ Source Imbalance, 50/60 Hz

Normal Mode Rejection 50/60 Hz 60 dB

Continuous 240 V rms maximum

Transient ANSI/IEEE C37.90.1-1989

Output Resistance4

Voltage Output Protection Continuous Short to Ground

Output Selection Time 6 µs @ C

Output Enable Control

Max Logic "0" +1 V

20.0 Ω

Noise

160 dB

Input Protection

50 Ω

= 0 to 2,000 pF

load

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