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DSCA36

Potentiometer Input Signal Conditioners, Bandwidth 3 Hz

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 85 dB of normal-mode rejection at 60 Hz and 80 dB at 50 Hz. 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. 0.25 mA) 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 240 VAC 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.

Circuit diagram Dataforth DSCA36

Block Diagram DSCA36



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4 Modules for Type DSCA36:

ModuleInputDescription
DSCA36-01 0 Ohm to 100 Ohm DSCA36 Isolated Potentiometer Input Signal Conditioner with Voltage- or Current-Output
DSCA36-02 0 Ohm to 500 Ohm DSCA36 Isolated Potentiometer Input Signal Conditioner with Voltage- or Current-Output
DSCA36-03 0 Ohm to 1000 Ohm DSCA36 Isolated Potentiometer Input Signal Conditioner with Voltage- or Current-Output
DSCA36-04 0 Ohm to 10000 Ohm DSCA36 Isolated Potentiometer Input Signal Conditioner with Voltage- or Current-Output

Specifications

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  • Input: Potentiometer up to 10 kOhm
  • Output: 0V…10V / 0mA…20mA / 4mA…20mA
  • Bandwidth 3 Hz
  • Isolation 1500 Vrms
  • Input protection 240 Vrms
  • Input Resistance 50 MOhm
  • Accuracy ± 0.03%
  • Linearity ± 0.01%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB
  • True 3-way isolation
  • NMR: 85/80dB at 60/50Hz
  • Power Supply 15 to 30 VDC
  • Operating Temperature Range -40°C … +80°C
  • Adjustability of +/-5 % Zero and span
  • 5-pol. Filtering
  • Dimensions 75 x 22.5 x 105 mm
  • DIN Rail Mounting
  • CE and ATEX certified, C-UL-US compliant
  • Special Solutions on request