Impulse SCM5B40_41 User Manual

Analog voltage input modules, wide bandwidth, Scm5b

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Isolated Analog Signal Conditioning Products

SCM5B

SCM5B40/41

Analog Voltage Input Modules, Wide Bandwidth

Description

Each SCM5B40 and SCM5B41 wide bandwidth voltage input module provides

a single channel of analog input which is amplified, isolated, 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.
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 10kHz. 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%.
A special input circuit on the SCM5B40 and SCM5B41 modules provides

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

Figure 1: SCM5B40/41 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
• 100dB CMR
• 10kHz Signal Bandwidth
• ±0.03% Accuracy
• ±0.01% Linearity
• ±1µV/°C Drift
• CSA Certified, FM Approved, CE and ATEX

Compliant

• Mix and Match SCM5B Types on Backpanel

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