Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p119
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 321244–324045

a passing lamp only, designed for left-hand traffic.

       1.2.1.3. Measuring equipment

       The measuring equipment shall be equivalent to that used during headlamp approval   tests.   A   standard   (reference)   filament   lamp   shall   be   used   for   the   photometric verification.

       2. TEST FOR CHANGE IN VERTICAL POSITION OF THE CUT-OFF LINE UNDER THE INFLUENCE OF HEAT

       This test consists of verifying that the vertical drift of the cut-off line under the influence of heat does not exceed a specified value for an operating passing lamp.

       The headlamp tested in accordance with paragraph 1, shall be subjected to the test described in 2.1., without being removed from or readjusted in relation to its test fixture.

       2.1. Test

       The test shall be carried out in a dry and still atmosphere at an ambient temperature of 23 degrees C +/- 5 degrees C.

       Using a mass production filament lamp which has been aged for at least one hour the headlamp shall be operated on passing beam without being dismounted from or readjusted in relation to its test fixture. (For the purpose of this test, the voltage shall be adjusted as specified in paragraph 1.1.1.2.). The position of the cut-off line in its horizontal part (between vv and the vertical line passing through point B 50 L for right- hand traffic or B 50 R for left-hand traffic) shall be verified 3 minutes (r3) and 60 minutes (r60) respectively after operation.

       The measurement of the variation in the cut-off line position as described above shall be carried out by any method giving acceptable accuracy and reproducible results.

       2.2. Test results

       2.2.1. The result in milliradians (mrad) shall be considered as acceptable for a passing lamp, only when the absolute value

       Delta rI = | r3 - r60 | recorded on the headlamp is not more than 1.0 mrad (Delta rI < 1.0 mrad).

       2.2.2. However, if this value is more than 1.0 mrad but not more than 1.5 mrad (1.0 mrad < DrI < 1.5 mrad) a second headlamp shall be tested as described in paragraph 2.1. after being subjected three consecutive times to the cycle as described below, in order to stabilize the position of mechanical parts of the headlamp on a base representative of the correct installation on the vehicle:

       Operation of the passing beam for one hour, (the voltage shall be adjusted as specified in paragraph 1.1.1.2.),

       Period of rest for one hour.

       The headlamp type shall be considered as acceptable if the mean value of the absolute values Delta rI measured on the first sample and Delta rII measured on the second sample is not more than 1.0 mrad.

Annex 5

MINIMUM REQUIREMENTS FOR CONFORMITY OF PRODUCTION CONTROL PROCEDURES

       1. GENERAL

       1.1. The conformity