Impulse DSCA32 - Manual

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