These four-column prestressed frames are manufactured with specific quality characteristics (processing, tolerances), piston/cylinder group, spherical seat, compression plates, spacers, etc., compliant and complying with the high stability verification (force distribution).
Stability compliance is certified by verifying the self-alignment (foot-meter test) of the machine components and the restraint of the seat/upper spherical plate movement, by using a special electrical deformation load column at 5 measuring points. that is connected to your appropriate data logger.
The most important characteristic of high stability frames is their uniform distribution of the applied load over the entire surface of the specimen under test. The sample breakage is satisfactory and the strength results are correct, high and true.
Compression testing machines tested for high stability meet the strict requirements of: EN 12390-4 | BS 1881:115 | DIN 51220 | UNI 6686, part 3 | NF P18-411 | UNE 83304 | ASTM C39 | AASHTO T22