dsca36-04 Dataforth Corporation, dsca36-04 Datasheet

dsca36-04

Manufacturer Part Number

dsca36-04

Description

Potentiometer Input Signal Conditioners

Manufacturer

Dataforth Corporation

Datasheet

1.DSCA36-04.pdf (2 pages)

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Description

Each DSCA36 potentiometer input module provides a single channel of

potentiometer input which is filtered, isolated, amplified, and converted to a

high-level voltage output. Signal filtering is accomplished with a five-pole filter

which provides 85dB of normal-mode rejection at 60Hz and 80dB at 50Hz. 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.

Potentiometer excitation is provided from the module using a precision current

source. Lead compensation is achieved by matching two current paths which

cancels the effects of lead resistance. The excitation current is small (approx.

0.25mA) which minimizes self-heating of the sensor.

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.

DSCA36

Potentiometer Input Signal Conditioners

Figure 1: DSCA36 Block Diagram

196

For information call 800-444-7644

High Performance Signal Conditioners

• Interfaces to Potentiometers up to 10k

• Industry Standard Output of Either 0-10V,

• 1500Vrms Transformer Isolation

• ANSI/IEEE C37.90.1 Transient Protection

• Input Protected to 240VAC Continuous

• True 3-Way Isolation

• Wide Range of Supply Voltage

• 160dB CMR

• 85dB NMR at 60Hz, 80dB at 50Hz

• ±0.03% Accuracy

• ±0.01% Linearity

• Easily Mounts on Standard DIN Rail

• C-UL-US Listed

• CE and ATEX Compliant

0-20mA, or 4-20mA

Features

Ω

DSCA

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dsca36-04 Summary of contents

Page 1

... DSCA36 Potentiometer Input Signal Conditioners Description Each DSCA36 potentiometer input module provides a single channel of potentiometer input which is filtered, isolated, amplified, and converted to a high-level voltage output. Signal filtering is accomplished with a five-pole filter which provides 85dB of normal-mode rejection at 60Hz and 80dB at 50Hz. An anti-aliasing pole is located on the field side of the isolation barrier, and the other four poles are on the system side ...

Page 2

... High Performance Signal Conditioners Ordering Information DSCA36 Model 0Ω to 10kΩ DSCA36-01 DSCA36-02 240Vrms max DSCA36-03 ANSI/IEEE C37.90.1 DSCA36-04 65µA; 10kΩ Sensor ±0.02Ω/Ω; 10kΩ Sensor † Output Ranges Available See Ordering Information 600Ω max Output Range 8mA (V ), 30mA(I ...

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