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videoXtens Array

The extremely versatile extensometer for high resolution in a wide measurement range. Download
Max. measurement range
  • 680 mm
Temperature range
  • Ambient temperature
Type of test + change in width
  • Tensile test
  • Change in width measurement
  • Strain distribution
  • r-value determination
  • Test Re-Run
  • 2D dot matrix
  • Metals

Patented technology ensures 100% validity of performed tests

videoXtens Array systems provide the highest level of flexibility and accuracy for a wide range of applications. The videoXtens Array series contains an option of three, four or six high-resolution cameras for the measurement of axial extension.

The patented array technology consolidates overlapping fields of view into one large field of view. The combination of the large field of view and the blue contrast light ensures complete illumination of the specimen and detection of the fracture along the entire area of grip-to-grip separation. This allows you to achieve 100% validity of performed tests, even when the fracture lies outside of the original gauge length, which may also be significantly smaller than the grip-to-grip separation.

  • 100% validity of performed tests due to the detection of every fracture location.

  • Optimal illumination of the entire specimen through integrated blue contrast light.

  • Significant time and cost savings through measurement without gauge marks.

  • Particularly low wear, especially for high specimen throughput or vigorous specimen breaks.

  • Closed loop strain rate control to ISO 6892-1 Method A1

Non-contact strain measurement on metal specimens with the videoXtens Array

The videoXtens Array extensometer is used for tensile tests on stranded wires, reinforcing bars or heavy plate.

Key advantages and features

Reliable test results
Measuring without gauge marks
Wide range of applications for metals
Strain control to ISO 6892-1 Method A1
Determining the r-value

Reliable test results

  • Brittle-fracturing metal specimens can be tested up to the highest break forces without damaging the extensometer.
  • The dust-proof housing protects against dust and flaking scale and cinder, and prevents misalignment.
  • With the large, fully illuminated field of view, every point of fracture can be recorded. Therefore, when combined with the rerun or strain distribution function, no tests have to be discarded, even if the break occurs outside the original gauge length. This means: 100% of the tests are valid.
  • The rerun function enables manual, subsequent shifting of the gauge length to the area of the break.
  • The strain distribution function enables automatic live shifting of the gauge length around the area of the largest strain and thereby into the area of the break.
  • The integrated blue contrast light provides optimal and homogeneous illumination of the entire specimen.
  • Significant time and cost savings, especially when using the rerun or strain distribution function, since these allow the videoXtens to test the full specimen without using gauge marks.
  • The videoXtens is fully integrated in testXpert III. The extensometer and the materials testing machine are controlled with a single software solution.

Benefits of the HP version

  • Accuracy Class 0.5 to EN ISO 9513
  • Strain rate control to ISO 6892-1 A

Measuring without gauge marks

Metal specimens have a surface texture or roughness. With the blue contrast light the texture of the specimen becomes visible enough to provide virtual gauge marks. A virtual gauge mark is an area on the specimen surface that is defined by the software. The pattern within this defined area is tracked during the test, which makes manual specimen marking unnecessary.

One of the prerequisites for measuring without gauge marks is a non-transparent specimen as well as a specific surface texture, such as milling grooves or cold or hot rolled surfaces. If these requirements are not met, measurement can be performed using markings. Distinct patterns on a specimen, such as ribs on concrete-reinforcing steel can be used as markings. An artificial pattern can also be easily applied with a pattern spray, which is optimal for strain distribution measurements.

Wide range of applications for metals

videoXtens Array systems are ideal for testing a variety of metal specimens:

Strain control to ISO 6892-1 Method A1

The videoXtens Array HP series has been released for closed loop strain rate control according to ISO 6892-1 Method A1 for gauge lengths from Le0 50 mm or 100 mm.

Determining the r-value

  • The additional camera for change-in-width measurement, including r-value determination (optional), always faces the center of the field of view, and therefore the center of the specimen.
  • More precise determination of the change in width: the width is measured on the specimen exactly where it is initially set via the measuring lines, e.g. centered between the gauge marks. Up to ten measuring lines can be defined for the change-in-width measurement.

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  • videoXtens Array systems PDF 2 MB