Video Extensometer – VEM 200 Series

Tinius Olsen’s VEM 200 series of video extensometer modules is designed to measure low levels of strain from 0.01% in tensile, shear, compression, and flexural modes. The units are completely combined with the testing machine and result-reporting software, supporting strain rate control, many gauge length click-and-drag placements, and real-time results during and throughout the test.

The VEM 200-Series is directly compatible with the entire range of Tinius Olsen testing machine frames. It is mounted using a stabilized carbon fiber arm with integrated X, Y and Z fine positioning adjustment for ideal measuring performance.

The unit can be mounted at the rear or front of a testing machine, right or left in keeping with operator comfort and efficiency of use. The extensometer on its mounting arm can be rapidly moved away from the test area, allowing test specimens to be placed into the test area and specimen grip system. When the specimen is prepared, the extensometer is equally swiftly swung back into place, locating exactly using the magnetic homing position – simple, precise and fast.

The integral lighting strip guarantees repeatability in tests regardless of lab conditions yet requires no special light sources or red colors, being easily regulated by the user modifying intensity as required, to guarantee a stable light environment. These adaptable extensometer modules are available in a range of different performance configurations each compatible with Tinius Olsen’s Horizon and VSS materials testing software, whether the Basic, Standard, or Advanced option.

The precise camera, lens and data acquisition technology delivers zero gauge length error every time and rapid application of gauge marks, including for the measurement of rotation (to monitor specimen alignment) during testing. Calibration is digitally embedded but, for reassurance, can be verified at any time using the standard traceable gauge block supplied.

For a majority of applications, a single VEM extensometer module is adequate, but up to four extensometer modules can be synchronized and work together capturing four simultaneous events.

The VEM Video Extensometer is the future of extensometery as it optimizes productivity through speed of use, enhances repeatability, and aids traceability via the embedded strain data video stored as part of the results data set. Furthermore, there are no mechanical parts under strain when exposed to the release force at the specimen break point.

Our Video Extensometer is perfect for precise, non-contact measurement of specimen strain

VEM Ext. model Maximum axial tensile strain range (%) at specified gauge length (mm)¹ Maximum axial compressive strain range (%) at specified gauge length (mm) ¹ Maximum transverse gauge length (mm)² Typical extension resolution (µm)³ Maximum test speed (mm/min) Minimum specimen width for measurements (mm) Field of view (mm)
10 25 50 10 25 50 Axial Transverse
VEM-201 75 - - 40 - - 17 0.07 100 0.4 1.7 23 x 19
VEM-202 120 15 - 40 40 - 19 0.12 150 0.7 3.2 33 x 26
VEM-203 190 35 - 40 40 - 31 0.12 150 0.7 3.2 42 x 35
VEM-204 300 80 10 40 40 25 45 0.18 250 1.0 4.6 61 x 51
VEM-205 460 145 40 40 40 40 63 0.25 350 1.4 6.4 86 x 72
VEM-206 100 5 - 40 10 - 6 0.1 700 0.6 3.0 29 x 8
VEM-207 250 60 - 40 40 - 10 0.2 1300 1.1 5.0 52 x 14
VEM-208 390 120 25 40 40 40 15 0.3 1900 1.7 8.0 76 x 21
VEM-209 580 190 65 40 40 40 21 0.4 2600 2.4 11 107 x 30

Key Features

  • Non-contacting video extensometer solution
  • One extensometer measures in compression, flexural, tension, shear modes
  • There is no need for bonded strain gauges or many clip-on extensometers for r&n
  • Supports axial, orthogonal, transverse, and rotational measurements
  • Provides a permanent record for recall of the test in video format with full resolution embedded strain data
  • Meets the requirements of ISO 9513 class 0.5, GB/T 12160 class 0.5, and ASTM E83 class B1

Video Extensometer – VEM 200 Series

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Picture 3 (A heavy-duty tripod is available to facilitate the use of VEM with legacy Tinius Olsen and other test machines)

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