Impulse DSCA33 User Manual download pdf

High Performance Signal Conditioners

DSCA

For information call 800-444-7644

134

DSCA33

Isolated True RMS Input Signal Conditioners

Description

Each DSCA33 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 standard process voltage or current output (Figure 1).

The field voltage or current input signal is processed through an AC coupled

pre-amplifier and RMS converter on the field side of the isolation barrier. The

converted dc signal is then filtered and 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 industry standard outputs.

Module output is either voltage or current. For current output models a

dedicated loop supply is provided at terminal 3 (+OUT) with loop return located

at terminal 4 (-OUT). The system-side load may be either floating or grounded.

Special input circuits provide protection against accidental connection of

power-line voltages up to 480VAC and against transient events as defined

by ANSI/IEEE C37.90.1. Protection circuits are also present on the signal

output and power input terminals to guard against transient events and power

reversal. Signal and power lines are secured to the module using screw

terminals which are pluggable terminal blocks for ease of system assembly and

reconfiguration.

DSCA33 modules have excellent stability over time and do not require

recalibration, however, both zero and span settings are adjustable to

accommodate situations where fine tuning is desired. The adjustments are

made using potentiometers located under the front panel label and are

non-interactive for ease of use.

Features

 Interfaces RMS Voltage (0  300V) or

RMS Current (0  5A)

 Designed for Standard Operation with

Frequencies of 45Hz to 1000Hz

(Extended Range Operation to 20kHz)

 Compatible with Standard Current and

Potential Transformers

 Industry Standard Output of either 0-1mA,

0-20mA, 4-20mA, 0-5V, or 0-10VDC

 ±0.25% Factory Calibrated Accuracy

(Accuracy Class 0.2)

 ±5% Adjustable Zero and Span

 1500Vrms Transformer Isolation

 Input Overload Protected to 480V

(Peak AC & DC) or 10A RMS Continuous

 ANSI/IEEE C37.90.1 Transient Protection

 Easily Mounts on Standard DIN Rail

 C-UL-US Listed

 CE and ATEX Compliant

▲

Figure 1: DSCA33 Block Diagram

* Current Input Models only

** Add jumpers for Current Input Modules

(provided with DSCA33-06, -07)

1 2

Summary of Contents

Page 1 - Features

High Performance Signal ConditionersDSCAFor information call 800-444-7644134DSCA33Isolated True RMS Input Signal ConditionersDescriptionEach DSCA33 Tr

Page 2 - Ordering Information

High Performance Signal ConditionersDSCAVisit our website www.dataforth.com135DSCASpecificationsInputSignal Range 100mV to 300Vrms, 0 to 5ArmsStandard

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