Impulse DSCA39 - Manual

High Performance Signal Conditioners DSCA
For information call 800-444-7644 144
DSCA39
Current Output Signal Conditioners
Description
Each DSCA39 current output module provides a single channel of analog
output. The input signal is buffered, isolated, filtered and converted to a unipolar
or bipolar current output. Signal filtering is accomplished with a five-pole filter
which provides 100dB per decade of attenuation above 1kHz. An anti-aliasing
pole is located on the system side of the isolation barrier, and the other four poles
are on the field side. After the initial system-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.
Special output 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 input 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.
Figure 1: DSCA39 Block Diagram
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Features
• Accepts High Level Voltage Input
• Provides 4 to 20mA, 0 to 20mA, or -20
to +20mA Output
• ANSI/IEEE C37.90.1 Transient Protection
• 1500Vrms Transformer Isolation
• ±0.03% Accuracy
• ±0.01% Linearity
• Output Protected to 240VAC Continuous
• True 3-Way Isolation
• Wide Range of Supply Voltage
• 100dB CMR
• Easily Mounts on Standard DIN Rail
• C-UL-US Listed
• CE and ATEX Compliant