Extensometer Calibration Rig (ECR)

The Si-Plan AQD ECR is capable of being calibrated according to ISO 9513 and ASTM E84

A micrometer drum drives a lever arm using a long push rod. The other end of the lever arm raises or lowers the upper test bar holder via a short push rod. The lever arm has a 10:1 reduction thereby increasing the resolution of the micrometer. The travel of the upper test bar holder is constrained by spring strips. The lower test bar holder is fixed.

Test bars are placed in the two holders and the extensometer mounted on the two bars (sometimes referred to as a split test piece). The micrometer drum is then used to move the upper test piece and the reading from the micrometer (reduced by a factor of 10) is compared with that of the extensometer.