DI–720/DI–722/DI–730 Series User Manual
Accessories
95
DI-5B48 Accelerometer Input Modules
The DI-5B48 provides excitation to piezoelectric sensors with built-in microelectronic amplifiers, commonly known
as ICP®* or IEPE* or LIVM* sensors. The module provides a constant current excitation to the sensor, then isolates,
filters, and amplifies the sensor output, yielding a high-level analog voltage output. The excitation current, signal
gain, and filter high-pass and low-pass cutoff frequencies are field-configurable through a set of slide switches.
Six poles of signal filtering in the DI-5B48 module result in greater than 100dB of normal-mode rejection for signal
frequencies above the cutoff frequency. One pole of filtering is on the field side of the isolation barrier for anti-alias-
ing purposes and the remaining five-pole programmable Bessel filter is located on the system side. High-pass filter-
ing is achieved through a second order passive filter, located on the field side. If desired, the output switch can be
turned on continuously by simply connecting pin 22, the Read-Enable pin, to I/O Common, pin 19.
The DI-5B48 offers the option of setting the constant current source for sensor excitation to common values of 4mA
or 9mA with a compliance voltage of 24VDC. Programmable gains of 1, 10 and 100 are selectable and the module
offers a ±10V output. The required supply level is +5VDC, ±5%.
To ensure protection of expensive data acquisition equipment, the DI-5B48 module signal inputs and sensor excita-
tion outputs are protected against accidental connection of voltages up to 240Vrms.
Ordering Information
MODEL
INPUT RANGE
OUTPUT RANGE
BANDWIDTH
ISOLATION VOLTAGE
DI-5B48-01
±10V max
±10V
2.5kHz to 20kHz
1500
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