Where helmets are of the type intended to protect a static user from predominantly falling hazards, a series of impact tests are carried out using a fixed headform, with a falling mass striker. The helmet under test is placed onto a suitably-sized (and dimensioned) headform, mounted on top of a load cell, which in turn is mounted to a rigid (and monolithic) base. A striker, in this case with a hemispherical surface, of a suitable mass (5 kg) is dropped onto the helmet from a specific height (1 metre). The force transmitted through the helmet is measured using the load cell beneath the headform, and recorded onto a graph. For a helmet to meet the requirements of EN 397, the maximum transmitted force, after suitable signal conditioning, cannot exceed 5 kN. This test is carried out on several helmet samples, following pre-conditioning to high temperature, low temperature, water immersion and UV ageing. There is also the option to expand the temperature range for the pre-conditioning if claimed by the manufacturer.