DI–4718B Series Hardware Manual
DI-8B Modules
35
DI-8B38 Strain Gage Input Modules, Narrow & Wide Bandwidth
Each DI-8B38 module isolates, filters and amplifies a full-bridge strain gage input signal and provides an analog volt-
age output.
The 8B38 can interface to transducers with a nominal resistance of 100 to 2k. Bridge excitation is provided from the
module with a stable 10.00V or 3.33V source. Full scale sensitivities of 2mV/V and 3mV/V are offered as standard.
Signal filtering is accomplished with a five-pole filter optimized for time and frequency response which provides
100dB per decade of normal-mode rejection above the filter cutoff frequency. One pole of this filter is on the field
side of the isolation barrier for anti-aliasing, and the other four are on the system side.
A special input circuit on the DI-8B38 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.
Isolation is provided by optical coupling to suppress transmission of common mode spikes or surges. The module is
powered from +5VDC, ±5%.
Ordering Information
MODEL
BANDWIDTH INPUT RANGE
EXCITATION
OUTPUT RANGE
DI-8B38-01
3kHz
-10mV to +10mV 3.333V at 3mV/V Sensitivity
-5V to +5V
DI-8B38-02
3kHz
-30mV to +30mV 10.0V at 3mV/V Sensitivity
-5V to +5V
DI-8B38-05
3kHz
-20mV to +20mV 10.0V at 2mV/V Sensitivity
-5V to +5V
DI-8B38-31
3Hz
-10mV to +10mV 3.333V at 3mV/V Sensitivity
-5V to +5V
DI-8B38-32
3Hz
-30mV to +30mV 10.0V at 2mV/V Sensitivity
-5V to +5V
DI-8B38-35
3Hz
-20mV to +20mV 10.0V at 2mV/V Sensitivity
-5V to +5V
