Document ID: chunk:federal_register_of_legislation:F2008C00179:body:0:p22
Version: federal_register_of_legislation:F2008C00179
Segment Type: other
Provision Reference: 
Character Range: 61469–64150

axis sensitivity = > 5 % of the lowest point on the scale.

    1.3.2        Speed :

    accuracy = +/- 2.5 % of real value;

    sensitivity = 0.5 km/h.

    1.3.3        Time recording :

    the instrumentation shall enable the action to be recorded throughout its duration and readings to be made to within one thousandth of a second;

    the beginning of the impact at the moment of first contact between the headform and the test component shall be noted on the recordings used for analysing the test.

    1.4              Test procedure (see annex 10, explanatory notes to paragraph 1.4. of annex 4)

    1.4.1        At every point of impact on the surface to be tested the direction of impact is the tangent to the trajectory of the headform of the measuring apparatus defined in annex l.

       1.4.1.1                For testing the parts, as referred to in paragraphs 5.3.4.1. and 5.4.2.2. of this Regulation, the arm of the measuring apparatus shall be lengthened until contact is made with the part to be considered, up to a limit of 1,000 mm between the pivot point and the top of the head of the apparatus. However, any roof sticks or ribs referred to in paragraph 5.4.2.2. which cannot be contacted shall remain subject to the requirements of paragraph 5.4.2.1. of this Regulation, with the exception of that relating to the height of the projection.

    1.4.2        Where the angle between the direction of impact and the perpendicular to the surface at the point of impact is 5 degrees or less, the test shall be carried out in such a way that the tangent to the trajectory of the centre of percussion of the pendulum coincides with the direction of impact. The headform shall strike the test component at a speed of 24.1 km/h or, in the case of components which cover an uninflated airbag, at a speed of 19.3 km/h; this speed shall be achieved either by the mere energy of propulsion or by using an additional impelling device.

    1.4.3        Where the angle between the direction of impact and the perpendicular to the surface at the point of impact is more than 5 degrees, the test may be carried out in such a way that the tangent to the trajectory of the centre of percussion of the pendulum coincides with the perpendicular to the point of impact. The test speed shall then be reduced to the value of the normal component of the speed prescribed in paragraph 1.4.2.

    2.                   Results

    2.1              In tests carried out according to the above procedures, the deceleration of the headform shall not exceed 80 g continuously for more than 3 milliseconds. The deceleration rate taken shall be the average of the readings of the