Impulse SCM5B40_41 - Manual

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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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