Impulse DSCA43 - Manual

High Performance Signal Conditioners DSCA
For information call 800-444-7644 150
DSCA43
General Purpose Input Signal Conditioners, with DC Excitation
Description
Each DSCA43 general purpose input module provides a single channel of
transducer input which is filtered, isolated, amplified, and converted to a high level
voltage output. Signal filtering is accomplished with a five-pole filter 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.
Transducer excitation is provided from the module by a stable 10V source. This
source is fully isolated, allowing the amplifier inputs to operate over the full range
of the excitation voltage. This feature enables the module to be interfaced to a wide
variety of sensors requiring exctitation.
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 signal input and excitation 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
Figure 1: DSCA43 Block Diagram
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Features
• Interfaces to Transducers and Other Devices
Requiring a Stable, Isolated DC Supply
• Industry Standard Output of Either 0-10V,
±10V, 0-20mA, or 4-20mA
• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1 Transient Protection
• Input Protected to 240VAC Continuous
• True 3-Way Isolation
• Wide Range of Supply Voltage
• 100dB CMR
• Fully Isolated Excitation Supply
• ±0.03% Accuracy
• ±0.01% Linearity
• Easily Mounts on Standard DIN Rail
• C-UL-US Listed
• CE and ATEX Compliant
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.