● Interfaces to Potentiometers up to 10,000 Ω ● High Level Voltage Outputs ● 1500 Vrms Transformer Isolation ● ANSI/IEEE C37.90.1 Transient Protection ● Input Protected to 240VAC Continuous ● 120 dB CMR ● 70 dB NMR at 60 Hz ● ±0.05% Accuracy ● ±0.02% Linearity ● Low Drift with Ambient Temperature ● CSA, FM and CE Certifications Pending ● Mix and Match Modules
DI-8B modules are an optimal solution for monitoring real-world process signals and providing high level signals to a data acquisition system. 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 voltages up to 240VAC. Clamp circuits on the I/O and power terminals protect against harmful transients.
The modules are designed for installation in Class I, Division 2 hazardous locations and have a high level of immunity to environmental noise.
