Division 4.4.1
United Kingdom
One of the accelerometers shall have its sensitive axis perpendicular to the mounting face A (Figure 12) and its seismic mass shall be positioned within a cylindrical tolerance field of 1 mm radius and 20 mm length. The centre line of the tolerance field shall run perpendicular to the mounting face and its mid point shall coincide with the centre of the sphere of the headform impactor.