DI–4718B Series Hardware Manual
DI-8B Modules
34
DI-8B36 Potentiometer Input Modules
Each DI-8B36 module isolates, filters and amplifies a single channel of potentiometer input and provides an analog
voltage output.
Excitation for the potentiometer is provided by using two matched current sources. When using a 3-wire connection,
this method allows equal currents to flow through the sensor leads, cancelling the effects of lead resistances. The
excitation currents are small (0.25mA) which minimizes the self-heating of the potentiometer.
Signal filtering is accomplished with a three-pole filter optimized for time and frequency response which provides
70dB of normal-mode-rejection at 60Hz. One pole of this filter is on the field side of the isolation barrier for anti-
aliasing, and the other two are on the system side.
A special input circuit on the DI-8B36 module provides protection against accidental connection of power-line volt-
ages up to 240VAC. Clamp circuits on the I/O and power terminals protect against harmful transients.
Ordering Information
MODEL
INPUT RANGE
OUTPUT RANGE
DI-8B36-01
0 to 100
0V to +5V
DI-8B36-02
0 to 500
0V to +5V
DI-8B36-03
0 to 1k
0V to +5V
DI-8B36-04
0 to 10k
0V to +5V
