MTS Fundamental Video Extensometer - Manual (Page 28)

Fundamental Video Extensometer 28
Starting the Video Extensometer
Refer to the following table for a description of the callouts in the above figure.
Callout Description
1 Confirmation of the localization of the markers:
• the green circle represents the minimal area.
• the red circle represents the maximum area.
The markers must be positioned approximately between these two circles. If it is not the case,
continue its progression until meeting new markers or until reaching the end of the progression
bar.
2 Display of the image captured by the video acquisition board. It also makes it possible to
visualize the area of the markers as well as the noted strains.
3 Recall of the test conditions.
4 Posting of information related to the strain, like L0 of each strain and the current strain. In
addition, it allows to know the number of processed images per second during the test.
5 Manual optimization of the image. If the box is checked, it is possible to reach the sliders, which
make it possible to adjust the image. Brightness varies the level of white and contrast varies the
level of black.
Recall: The image can be adjusted manually and the automatic search of the markers is still
possible.
6 Manual adjustment of the area of the markers. It is necessary to determine the size of the area in
which the markers are. In this case the circles appear automatically.