A Laser Extensometer of the type P-50 is used to measure the deformation at cyclic loading of about 1 Hz. The tests are carried out under closed loop control of the strain signal.
The system is integrated in the MTS tensile tester. The tensile tester delivers the start- and stop signal to the extensometer. The extensometer delivers the strain as an analog signal. Status information, for instance "data is valid", are transferred as a digital signal to make sure, that the tensile testor works under good measuring conditions.