• Fundamentals of measuring with strain gauges.
  • Strain gauge types and application techniques.
  • Calculation of the mechanical deformations. under tension, bending and torsion.
  • Calculation of Poisson’s ratio using tensile test.
  • Correlation between mechanical strain and electrical resistance in a strain gauge.
  • Determination of the modulus of elasticity for from the measurement data of a tensile test.


  • Experimental unit investigating the fundamentals of strain gauge measurement.
  • Strain gauge application areas protected by Plexiglas cover.
  • Steel test bodies.
  • Display of strain gauge reading on digital multimeter (DMM).

This trainer is used to introduce students about strain gauge measurements. It explains principal operation of strain gauges and the conversion methods between electronics raw data, strains and forces.

By using this trainer student will learn how to connect bridge type sensors, strain in bending, torsion and tensile measurement using strain gauge.

Strain gauges are used extensively in sensor systems to detect forces, moments and deformations. The apparatus experimental unit provides a wide range introduction to the fundamentals of measurement by strain gauges.

Three test specimens for tension, bending and torsion are each fitted with four strain gauge measuring points. The strain gauges are wired in the full bridge. The specimens are loaded incrementally allowing for the strain reading to be sequentially monitored.

The specimens can be inserted quickly and precisely into the frame. The strain gauge measuring range is protected by a Plexiglas cover, which also makes it clearly visible for inspection purposes. The measurement amplifier supplies the bridge supply voltage, and displays the loaddependent “bridge detuning” digitally in voltage values.

The digital display also features a zero balancing function to allow for any preloading. The various elements of the experiment are clearly laid-out and housed securely in a box. Three additional tension bars are available as accessories, in brass, copper and aluminum, enabling the modulus of elasticity to be ascertained in experiments.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.