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8B Isolated Analog Signal Conditioning Products

8B33

Isolated True RMS Input Modules

Description

Each 8B33 True RMS input module provides a single channel of AC input which

is converted to its True RMS DC value, filtered, isolated, amplified, and

converted to a standard process voltage or current output (Figure 1).

The field voltage or current input signal is processed through a pre-amplifier and

RMS converter on the field side of the isolation barrier. The converted DC signal

is then chopped by a proprietary chopper circuit and transferred across the

transformer isolation barrier, suppressing transmission of common mode

spikes and surges. The computer side circuitry reconstructs, filters, and

converts the signal to an industry standard output of 0 to 5VDC.

Special input circuits provide protection against accidental connection of power

line voltages up to 350VAC and against transient events defined by ANSI/IEEE

C37.90.1.

Figure 1: 8B33 Block Diagram



Features

• Interfaces to RMS Voltage (0-300V) or RMS

Current (0-1A)

• Designed for Standard Operation with

Frequencies of 45Hz to 1000Hz (Extended

Range to 10kHz)

• Compatible with Standard Current and

Potential Transformers

• Industry Standard Output of 0 to 5VDC

• ±0.25% Factory Calibrated Accuracy

• 1500Vrms Transformer Isolation

• Input Overload Protected to 350Vrms Max

(Peak AC & DC) or 2Arms Continuous

• ANSI/IEEE C37.90.1 Transient Protection

• CE Compliant

• Hazardous Location Certifications Pending

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