Impulse SCM5B30_31 User Manual download pdf

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Isolated Analog Signal Conditioning Products

SCM5B

SCM5B30/31

Analog Voltage Input Modules, Narrow Bandwidth

Description

Each SCM5B30 and SCM5B31 voltage input module provides a single channel

of analog input which is filtered, isolated, amplified, and converted to a high level

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

allowing 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.

Signal filtering is accomplished with a six-pole filter which provides 95dB

of normal-mode-rejection at 60Hz and 90dB at 50Hz. Two poles of this filter

are on the field side of the isolation barrier, and the other four are on the

computer side.

After the initial field-side filtering, 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%.

A special input circuit on the SCM5B30 and SCM5B31 modules provides

protection against accidental connection of power-line voltages up to 240VAC.

Figure 1: SCM5B30/31 Block Diagram

▲

Features

 Accepts Millivolt and Voltage Level Signals

 High Level Voltage Outputs

 1500Vrms Transformer Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 160dB CMR

 95dB NMR at 60Hz, 90dB at 50Hz

 ±0.03% Accuracy

 ±0.005% Linearity

 ±1µV/°C Drift

 CSA Certified, FM Approved, CE and ATEX

Compliant

 Mix and Match SCM5B Types on Backpanel

1 2

Summary of Contents

Page 1 - SCM5B30/31

For information call 800-444-76446Isolated Analog Signal Conditioning ProductsSCM5BSCM5B30/31Analog Voltage Input Modules, Narrow BandwidthDescription

Page 2 - Ordering Information

Visit our website www.dataforth.com7Isolated Analog Signal Conditioning ProductsSCM5BSCM5BInput Range ±10mV to ±1V ±1V to ±40VInput Bias Current ±0.5n

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Impulse SCM5B30_31 User Manual

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