M208 AB dynamic data acquisition system
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Overview

The M208A-B system represents an advanced and cost-effective solution for multi-channel monitoring applications, offering reliability and versatility.

The M208A and M208B modules are designed as data acquisition and signal conditioning modules for dynamic sensors, including IEPE seismic accelerometers. These modules support a wide frequency range from 0.1 Hz to 100 kHz, covering a wide range of applications. They are particularly suitable for continuous monitoring of complex structural elements, enabling the detection of force and pressure signals. Acquired data can be easily visualized via Ethernet interface and browser (exclusively for the M208A model), while their rugged construction is designed for integration into racks and rack environments.

Dynamic IEPE 8-Channel Acquisition Unit – M208A / M208B

Application Fields

  • Vibration measurement

  • Dynamic monitoring of buildings

  • Monitoring vibration trends with remote control

  • Monitoring of elements and structures

  • Quality control in production

  • Laboratory measurements

  • Mobile applications via notebook PC

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Description

The M208A-B system is the most economical and reliable solution for multi-channel monitoring applications.
Thanks to the wide selectable frequency range from 0.1 Hz to 100 kHz, the M208 modules cover a wide range of applications.

The M208A and M208B series modules are acquisition and signal conditioning units for dynamic sensors such as IEPE seismic accelerometers. The modules can acquire force and pressure signals.

They are suitable for continuous monitoring of elements and structures. The acquired and recorded data can be displayed via Ethernet interface and browser (only M208A).
The external structure is designed for 19-inch rack mounting

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Features

  • 8-channel monitoring system

  • Gain increment from 0.1 to 1000, normalization with the insertion of a sensitivity transducer (only for M208A)

  • Wide frequency range from 0.1 Hz to 1000 Hz

  • Plug-in modules available for high-pass and low-pass filters

  • Display of RMS values and peak values with mechanical groups (only for M208A)

  • Ethernet interface and built-in web server for remote transmission of RMS, peak values, and setup (only for M208A)

  • PC control of up to 8 devices via serial interfaces (only for M208A)

  • PC control software included (only for M208A)

  • External relay command with selectable threshold levels

  • Overload and sensor LED indicators for each channel

  • Operation with mains adapter or DC power

  • 19-inch rack dimensions

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Technical Specifications 

Version M208A M208B
Inputs 8 voltage inputs; single-ended; 4 MΩ; AC coupled; BNC sockets
Suitable sensors IEPE compatible accelerometers, force transducers, pressure transducers and measuring microphones. Sensitivity range: 0.1000 to 12000 mV/mech. unit
IEPE sensor supply 3.8 to 5.6 mA constant current; compliance voltage 24 V; switchable
Sensor indicator LED and Display (interrupted / shorted)
Input voltage range ±10 V without clipping (at 0 dB gain); ±25 V peak
Outputs 8 buffered channel outputs; ±10 V; 100 Ω; BNC; Sub-D socket at rear1 buffered shared output; ±10 V; 100 Ω; BNC; Sub-D socket at rear
Gain ranges; fine tuning 1/10/100/1000; fine tuning 0.1–1000 1/10/100/1000
Gain accuracy at reference conditions <0.5 %(T = 0…30 °C; f = 100 % full scale; 80 Hz) <1 %(T = 0…30 °C; f = 100 % full scale; 80 Hz)
Measuring display 4 digits and decimal point ±2 %; true RMS or peak detection; 1 s multiplex –
Overload indicator Threshold adjustable for sensor and output separately from 3 to 10 V;Each channel 1 red LED
Available plug-in filters (–3 dB frequencies) High pass: 0.5 / 1 / 3 / 5 / 10 / 30 / 50 / 100 / 300 / 500 / 1000 Hz (Butterworth, 2nd order)Low pass: 0.5 / 1 / 3 / 5 / 10 / 30 / 50 / 100 kHz (Butterworth, 4th order)
Integrator modules (instead of filters, order separately) Single integrator 3 to 1000 Hz (Mod. FBV); double integrator 5 to 160 Hz (Mod. FBD)
TEDS support IEEE 1451.4 Template No. 25 (accelerometers and force transducers); Nos. 27 and 28 (microphones) –
Noise at output with filter 0.1 Hz – 30 kHz <0.4 mVrms (0 dB); <5 mVrms (20 dB); <6 mVrms  (40 dB); <10 mVrms  (60 dB)
Serial interface RS-232 Master/Slave (Daisy-Chain); 19200…115200 Bit/s –
Ethernet interface 10Base-T; RJ45 socket; integrated web server for HTML pages with measuring values and basic settings –
Relay output 1 relay; trip value selectable for each channel; change-over contact: 1 A / 30 V –
Power supply 10–28 VDC; <1.5 A or mains plug adapter PS1600 (115/230 VAC)
Operating temperature range –10 °C to +50 °C (15 °F to 120 °F)
Dimensions (without connectors); weight 483 mm × 44 mm (1 HU) × 124 mm; 1.7 kg483 mm × 44 mm (1 HU) × 124 mm; 19 in x 1.7 in x 4.9 in; 3.75 lbs
Accessories Supplied: Mains plug adapter PS1600; RS-232 daisy chain cable (M208A); Ethernet cable (M208A). Order separately: High-pass filter modules (FB3…Hz) and low-pass filter modules (FB2…kHz), or instead of filters: single integrator module (FBV) or double integrator module (FBD).

Warranty and Support

DRC guarantees service and support at its headquarters or at authorized centers.
Warranty: 24 months

Ordering Information

  • Code: 02.MMS.0012 – Dynamic Acquisition Unit M208A

  • Code: 02.MMS.0013 – Dynamic Acquisition Unit M208B

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