The result of a compression test on a cube or cylinder specimen is affected to a considerable extent (up to 30-35%) by a non-uniform application of the load on the surface of the sample causing its premature failure.

For this reason, the calibration certificate for the force measurement instrument mounted on the machine is not enough to guarantee the accuracy of the strength result.

All the main International Standards are designed to ensure that a good and uniform load is applied on the whole sample surface. They require the compression machines to be fitted with a suitable spherical seat and prescribe the assessment of the type of failure, as usually a non-uniform application of the load leads to unsatisfactory failures.

In addition, EN 12390-3 requires the compression machines be tested to verify:

the alignment of component parts of the machine
the self-alignment of the upper machine plate
a restraint of movement of the upper plate.

These verifications, commonly known as the Footemeter test or Stability test, can be performed by using a suitable strain gauged column consisting of a cylindrical load cell with four complete bridges disposed on two orthogonal diameters.

All EN Standards compliant CONTROLS compression machines are supplied complete with both traceable calibration certificate for load measurement accuracy and traceable test certificate for load transfer verification (Stability test).

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