The picture shows the signals that are measured. The acceleration signal shows the deceleration of the pendulum head because of the impact with the test specimen.  The angle signal is used for determination of the position of the pendulum arm resp. the test specimen. The acceleration sensor on the support gives feedback of the impact time. After testing the test data can be evaluated. The acceleration signal is used for evaluating the force, velocity and displacement, the angle signal for the displacement.

Different filters can be used for evaluation, the displacement and velocity can be determined in several ways. The picture shows an example of the influence of various filters.