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 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-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 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 SCM5B48 module signal inputs and sensor excitation outputs are protected against accidental connection of voltages up to 240Vrms.

*ICP is a registered trademark of PCB Group Inc.
*IEPE is Integrated Electronic Piezo-Electric
*LIVM is Low Impedance Voltage Mode
  • Interfaces to ICP®* or IEPE* or LIVM* Sensors
  • ±10V Output Range
  • 1500Vrms Transformer Isolation
  • ANSI/IEEE C37.90.1 Transient Protection
  • Input Protection to 240Vrms Continuous
  • 1, 10, and 100 Programmable Gain
  • 2.5, 5, 10, and 20kHz Programmable LP Filter
  • 0.2 and 10Hz Programmable HP Filter
  • 4mA or 9mA Programmable Current Excitation
  • ±0.2% Accuracy
  • ±0.01% Linearity
  • Low Drift with Ambient Temperature
  • -40°C to +85°C Operating Temperature Range
  • CE Compliant, CSA and FM Approvals Pending
  • Mix and Match Module Types on Backpanel
Accelerometer Input Module

SCM5B48 Devices

Part Number Input RangeOutput RangeBandwidthMechanical FormatIsolation Voltage (Vrms)
±10V max ±10V 2.5kHz to 20kHz Modular plug-in board 1500
±10V ±5V 2.5kHz to 20kHz Modular plug-in board 1500

Frequently Asked Questions

Can you explain how to use the DIP switches on SCM5B48 to achieve different settings?
Below are the SCM5B48 configurable parameters and their associated DIP switch designators in the order they appear left to right in the data sheet, Figure 2: SCM5B48 Side Label.

High Pass Filter, S5: DC, 0.2Hz, 10Hz

Switch S5 selects between DC coupling or AC coupling and between 0.2Hz or 10Hz low end of the High Pass filter cutoff frequencies.

Gain, S4: 1, 10, 100

Switch S4 selects from among the Gain settings = 1, 10, or 100. Since the output range is a fixed +/-10V -01 or +/-5V -02, the implication of this is that switch S4 actually selects the input voltage range as in the formula Vin = Vin max / G. Example: in an SCM5B48-01, S4 =10 the input voltage range is Vin = +/-10V / 10 = +/-0.1V.
Keep in mind, for DC coupling Vout = VAC + VDC which is limited to +/-10V total for -01 and +/-5V total for -02.

Excitation, S1: 4mA, 9mA

Switch S1 selects between excitation current sources of 4mA or 9mA +/-10%. They both have a compliance voltage of 24V +/-10%.

Low Pass Filter, S3, S2: 2.5kHz, 5kHz, 10kHz, 20kHz

Switch S3 and S2 select from among the Low Pass filter cutoff frequencies of 2.5kHz, 5kHz, 10kHz, or 20kHz.

Keywords/Phrases: SCM5B48, SCM5B48 DIP switches, SCM5B48 settings

Does Dataforth offer SCM5B48 modules with customized fixed-parameters?
Please send Dataforth the selections for the four configurable parameters of the SCM5B48.
Below are the parameters in the order they appear left to right in the data sheet, Figure 2: SCM5B48 Side Label.

High Pass Filter, S5: DC, 0.2Hz, 10Hz
Gain, S4: 1, 10, 100
Excitation, S1: 4mA, 9mA
Low Pass Filter, S3, S2: 2.5kHz, 5kHz, 10kHz, 20kHz

Dataforth will assign custom module number, generate a data sheet, and send it for review and signoff.

Keywords/Phrases: SCM5B48 fixed-parameter, SCM5B48 preset-parameter, fixed-parameter, preset-parameter