System reduces experimental stress analysis costs

Sensor Review

ISSN: 0260-2288

Article publication date: 1 June 2004




(2004), "System reduces experimental stress analysis costs", Sensor Review, Vol. 24 No. 2.



Emerald Group Publishing Limited

Copyright © 2004, Emerald Group Publishing Limited

System reduces experimental stress analysis costs

System reduces experimental stress analysis costs

Keywords: Stress analysis, CAN

HBM has introduced its CANHEAD system that reduces installation costs during experimental stress analysis using strain gages and is particularly suited to tests involving some hundreds or thousands of measuring points (Plate 10).

The system is based on separating the basic module from the amplifier module. The amplifiers are installed close to the application and a standard CANbus system is used for data transmission through the CANHEADs. This eliminates the need for expensive connection cables and simplifies installation.

Plate 10 Each CANHEAD is designed for ten channels and includes an analogue to digital (A/D) converter allowing synchronous data acquisition

Each CANHEAD is designed for ten channels and comes complete with an analogue to digital (A/D) converter for each channel allowing synchronous data acquisition. An additional channel is used for temperature compensation using a strain gage or a resistor.

A CanOpen protocol is used for transmitting data from up to 12 CANHEADs on a single bus line. HBM's ML74 communication module is used as the master for uploading data to an MGCplus or MGCsplit system and, for users of the catman® measurement software, the system provides Plug & Play compatibility.

An added advantage of the CANHEAD system is that the installation can be prepared before the amplifier is connected. The amplifier may also be removed without losing the acquired data from individual measuring points.

The range of CANHEAD products includes basic modules available in quarter or half bridge circuits for all standard strain-gage resistance values (120, 350, 700 and 1,000 V). The amplifiers operate on the 600 Hz carrier frequency eliminating both thermo-electric voltages at the points of contact and the DC voltage drift.

Bridge excitation voltages of 0.5, 1 and 2.5 V are available.

For more information, visit the Web site:

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