Impulse 8B39 User Manual

8b39, Current output modules

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8B Isolated Analog Signal Conditioning Products

8B39

Current Output Modules

Description

8B modules are an optimal solution for monitoring real-world process signals

and providing high-level signals to a data acquisition system. Each 8B39 module

accepts an input signal from a non-isolated source, then isolates, filters and

converts the signal to an analog process current output.
Signal filtering is accomplished with a three-pole filter optimized for time and

frequency response which provides 60dB per decade of normal-mode-

rejection above 100Hz. One pole of this filter is on the system side and the other

two are on the isolated field side.
A special output circuit in the 8B39 module provides protection against accidental

connection of power-line voltages up to 40VAC continuous. Clamp circuits on

the I/O and power terminals protect against harmful transients.
The modules are designed for installation in Class I, Division 2 hazardous

locations and have a high level of immunity to environmental noise.

Figure 1: 8B39 Block Diagram

Features

Accepts High Level Voltage or Process

Current Input

Process Current Output
1500Vrms Isolation
ANSI/IEEE C37.90.1 Transient Protection
Output Protected to 40VAC Continuous
110dB CMR
100Hz Signal Bandwidth
±0.05% Accuracy
±0.02% Linearity
Low Drift with Ambient Temperature
UL Listing Pending
Mix and Match Module Types on Backpanel

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