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SCM5B48

Accelerometer Input Module, Bandwidth up to 20 kHz

The SCM5B48 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 SCM5B48 module result in greater than 100 dB 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-aliasing purposes and the remaining five-pole programmable Bessel filter is located on the system side. High-pass filtering 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 SCM5B48 offers the option of setting the constant current source for sensor excitation to common values of 4 mA or 9 mA with a compliance voltage of 24 VDC. Programmable gains of 1, 10 and 100 are selectable and the module offers a ± 10 V output. The required supply level is + 5 VDC, ± 5%.

To ensure protection of expensive data acquisition equipment, the SCM5B48 module signal inputs and sensor excitation outputs are protected against accidental connection of voltages up to 240 Vrms.

Circuit diagram Dataforth SCM5B48

Block Diagram SCM5B48



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2 Modules for Type SCM5B48:

ModuleInputDescription
SCM5B48-01 ± 10 V SCM5B48 Isolated Accelerometer Input Module with Voltage-Input and Voltage-Output
SCM5B48-02 ± 10 V SCM5B48 Isolated Accelerometer Input Module with Voltage-Input and Voltage-Output

Specifications

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  • Input: ICP-Sensors
  • Output: - 5 V to + 10 V
  • 1, 10 and 100 programmable amplifying
  • Isolation 1500 Vrms
  • Input protection 240 Vrms
  • 2.5, 5, 10 and 20 kHz programmable Lowpassfilter
  • 0.2 and 10 Hz programmable Highpassfilter
  • 4 mA or 9 mA programmable power supply
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 100dB
  • Accuracy ± 0.2%
  • NMR: 100dB / Decade > Cutoff Frequency
  • Power Supply +5 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 58 x 57 x 15 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request