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Impulse DSCA32 User Manual

Dsca32, Analog current input signal conditioners, Dsca

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High Performance Signal Conditioners

DSCA

For information call 800-444-7644

132

DSCA32

Analog Current Input Signal Conditioners

Description

Each DSCA32 current input module provides a single channel of analog input

which is filtered, isolated, amplified, and converted to a high level voltage output.

Signal filtering is accomplished with a five-pole filter which which is optimized for

step response. An anti-aliasing pole is located on the field side of the isolation

barrier, and the other four poles are on the system side. After the initial field-side

filtering, 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.
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 240VAC 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 in pluggable terminal blocks for ease of system assembly and reconfiguration.
The modules have excellent stability over time and do not require recalibration,

however, zero and span settings are adjustable up to ±5% 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

• Accepts Milliamp Level Signals
• Industry Standard Output of either 0 to 10V,

0 to 20mA, or 4 to 20mA

• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1 Transient Protection
• Input Protected to 240VAC Continuous
• True 3-Way Isolation
• Wide Range of Supply Voltage
• 105dB CMR
• 5 Poles of Filtering
• ±0.03% Accuracy
• ±0.01% Linearity
• Easily Mounts on Standard DIN Rail
• C-UL-US Listed
• CE and ATEX Compliant

Figure 1: DSCA32 Block Diagram