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FL 100 Strain gauge training system



  • Basic introduction to measurement with strain gauges
  • Electronic measurement of mechanical variables
  • Test bars for tension, bending and torsion
  • Universal 1-channel measuring amplifier


Technical Description

Strain gauges are used extensively in sensor systems to detect forces, moments and deformations.

The FL 100 experimental unit provides a wide-ranging 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 measuring amplifier supplies the bridge supply voltage, and displays the load-dependent "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 storage system.

Three additional tension bars are available as accessories, in brass (FL 100.01), copper (FL 100.02) and aluminium (FL 100.03), 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.

Learning Objectives / Experiments

- fundamentals of measuring with strain gauges
- strain gauge types and application techniques
- calculation of the mechanical deformations under tension, bending and torsion
- correlation between mechanical strain and  electrical resistance in a strain gauge

With FL 100.01, FL 100.02, FL 100.03
- determination of the modulus of elasticity for various materials from the measurement data of a tensile test


[1] experimental unit investigating the fundamentals of strain gauge measurement
[2] tension, bending and torsion tests each with strain gauge measuring points in full bridge circuit
[3] strain gauge application areas protected by Plexiglas cover
[4] steel test bodies 
[5] determination of modulus of elasticity on various materials using measuring objects FL 100.01, FL 100.02, FL 100.03
[6] measuring amplifier with 4-digit digital display
[7] frame to house the measuring objects
[8] storage system to house the components

Technical Data

Tension bar 
- measuring length: 50mm
- cross-section: 2x10mm
Bending bar 
- length: 385mm
- cross-section: 5x20mm
Torsion bar
- length: 500mm
- d=10mm
Load, small: 10x 0,5N, 1x 1N (hanger)
Load, large
- 1x 5N, 2x 10N, 1x 20N, 1x 5N (hanger)
Strain gauge measuring point: full bridge, 350Ω
- measuring range: +/-2mV/V
- resolution: 1µV/V
- zero balancing adjustment range: +/-1mV
- supply voltage: 10VDC
Frame opening WxH: 480x450mm

Dimensions and Weight
LxWxH: 560x410x610mm (frame)
LxWxH: 600x400x320mm (storage system)
Weight: approx. 20kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 frame
3 strain gauge test specimens
2 sets of loads
2 hexagon socket wrenches
1 measuring amplifier with strain gauge connecting cable
1 storage system with foam inlay
1 set of instructional material

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