The customer is a main producer of electric locomotives in China and the state designated company of mass transit vehicles. The main products sold include electric locomotives and mass transit vehicles. Moreover, the company also extends its business into rail engineering vehicles, electrical equipment and braking systems. Its test center is specialized in testing all parts of the electric locomotive including drive power transformer, electric motor, transmission gearbox, car body strength etc.

The requirements for a data acquisition system

The customer wanted a Data Acquisition (DAQ) system that can be used both as a distributed system and also a centralized system. The device must be portable, compact and rugged - suitable for in-vehicle test under harsh conditions and able to supply excitation voltage for pressure transducers. The engineers needed to test the stress, temperature, pressure, revolution and vibration of the gear box of locomotives.

The HBM solution

According to the system requirements, we recommended our rugged DAQ, SomatXR series.
The powerful SomatXR data acquisition system is specially developed for use in harsh environments. The modules provide a wide temperature range and are protected from humidity, dust, shock and vibration.

The data acquisition system provides a web interface for simple operation without any software installation. This allows for convenient channel parameterization, monitoring of measurement jobs and visualization of measured data far away from the measuring point. In total, we offered ten different modules and related accessories.

The main modules offered:

The MX1615B-R strain gauge bridge amplifier is perfect for stress analysis; it enables connection of up to 16 sensors or strain gages in full-, half-, or quarter-bridge configurations. Only one module is required to measure all mechanical quantities. All channels also have been designed for compatibility with:

  • Voltage signals (± 60 V)
  • Potentiometric transducers
  • Resistance
  • and PT100 temperature sensor connections

The MX1601B-R standard amplifier provides measurement inputs for

  • Standardized voltage (±60 V, ± 10 V or ± 100 mV)
  • Standardized current (0 or 4 ... 20 mA)
  • IEPE/ICP© sensors
  • In 16 individually configurable channels - at an attractive price per channel

The CX23-R data recorder is the central module of the rugged SomatXR family. It synchronizes all connected measurement modules with Ethernet PTPv2*, stores recorded measurement data and provides computed channels and smart data compression using Somat DataModes™. This technology was developed specifically for the Somat products. It provides Time History, Time-at-Level (one-dimensional) as well as Burst History with Pre- and Post-Trigger times. The SIE file format is used to assure data integrity and to enable configuration parameters to be retrieved.

The following interfaces and ports ensure flexibility and scalability:

  • DIO interface with three digital inputs and two digital outputs
  • GPS interface for connecting a GPS receiver
  • Three CAN interfaces (ISO 11898, CAN 2.0A and 2.0B)
  • Two Ethernet ports for connection to other SomatXR modules
  • Ethernet host port for connecting a PC with up-to-date web browser

Why the customer chose HBM

The customer chose the SomatXR series due to its flexible, scalable and distributable capabilities. This reliable system can directly connect the IEPE and voltage drive transducers. After conducting a trial test, the customer was completely convinced that HBM's solution is easy to use, universal and reliable.

* = Precision Time Protocol Version 2

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