Impulse SCM5B43 User Manual download pdf

For information call 800-444-7644

Isolated Analog Signal Conditioning Products

SCM5B

SCM5B43

General Purpose Input Modules, with DC Excitation

Description

Each SCM5B43 general purpose input module provides a single channel of

transducer input which is filtered, isolated, scaled, and converted to a high level

analog voltage output (Figure 1). This voltage output is logic switch controlled,

which allows these modules to share a common analog bus without the

requirement of external multiplexers.

The SCM5B modules are designed with a completely isolated computer side

circuit which can be floated to ±50V from Power Common, pin 16. This complete

isolation means that no connection is required between I/O Common and Power

Common for proper operation of the output switch. If desired, the output switch

can be turned on continuously by simply connecting pin 22, the Read-Enable

pin, to I/O Common, pin 19.

The SCM5B43 can interface to devices which require a precision 10VDC

excitation supply. The 1kHz bandwidth significantly reduces ripple and noise

inherent in these devices.

Transducer excitation is provided from the module by a very stable 10V source.

The excitation supply is fully isolated, allowing the amplifier inputs to operate over

the full range of the excitation voltage. This feature offers significant flexibility in

real world applications. Eight full scale input ranges are provided, from ±1V to

±10V, producing ±5V full scale output.

The input signal is processed through a pre-amplifier on the field side of the

isolation barrier. This pre-amplifier has a gain-bandwidth product of 5MHz and

is bandwidth limited to 1kHz. After amplification, the input signal is chopped by

a proprietary chopper circuit. Isolation is provided by transformer coupling,

again using a proprietary technique to suppress transmission of common mode

spikes or surges. The module is powered from +5VDC, ±5%.

Special input circuits on the SCM5B43 module provide protection of the signal

inputs and the isolated excitation supply up to 240VAC.

Figure 1: SCM5B43 Block Diagram

Features

 Interfaces to DC Displacement Transducers

and Other Devices Requiring a Stable DC

Supply

 High Level Voltage Outputs

 1500Vrms Transformer Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 Fully Isolated Excitation Supply

 100dB CMR

 1kHz Signal Bandwidth

 ±0.03% Accuracy

 ±0.005% Linearity

 ±20µV/°C Drift

 CSA Certified, FM Approved, CE and ATEX

Compliant

 Mix and Match SCM5B Types on Backpanel

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Summary of Contents

Page 1 - Features

For information call 800-444-764432Isolated Analog Signal Conditioning ProductsSCM5BSCM5B43General Purpose Input Modules, with DC ExcitationDescriptio

Page 2 - Ordering Information

Visit our website www.dataforth.com33Isolated Analog Signal Conditioning ProductsSCM5BSCM5BSpecificationsModuleSCM5B43Typical at TA=+25°C and +5V powe

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Impulse SCM5B43 User Manual

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