Measurement methods. 1.1. When photometric measurements are taken, stray reflections shall be avoided by appropriate masking.
1.2. In the event that the results of measurements are challenged, measurements shall be taken in such a way as to meet the following requirements:
1.2.1. The distance of measurement shall be such that the law of the inverse of the square of the distance is applicable;
1.2.2. The measuring equipment shall be such that the angle subtended by the receiver from the reference centre of the light is between 10′ and 1°;
1.2.3. The intensity requirement for a particular direction of observation shall be satisfied if the required intensity is obtained in a direction deviating by not more than one quarter of a degree from the direction of observation.
Measurement methods. Any method may be used to measure variations of inclination provided that the readings are accurate to within ± 0.2 mrad (± 0.02 per cent inclination).
Measurement methods. 4.8.2.1. The photometric performance shall be checked in accordance with the relevant sub-paragraph of paragraph 4.7.
4.8.2.2. For multiple replaceable light sources: When equipped with light source(s) at 6.75 V, 13.5 V or 28.0 V, the luminous intensity values produced shall be corrected. For these replaceable filament light sources the correction factor is the ratio between the reference luminous flux and the mean value of the luminous flux found at the voltage applied (6.75 V, 13.5 V or 28.0 V). For LED light sources the correction factor is the ratio between the objective luminous flux and the mean value of the luminous flux found at the voltage applied (6.75 V, 13.5 V or 28.0 V). The actual luminous fluxes of light source used shall not deviate more than 5 per cent from the mean value. Alternatively, and in case of filament light sources only, a standard filament light source may be used in turn, in each of the individual positions, operated at its reference flux, the individual measurements in each position being added together.
4.8.2.3. For lamps except those equipped with filament light source(s)
4.8.2.3.1. For reversing lamps and maneuvering lamps, the luminous intensities measured after one minute and after 10 minutes of operation, shall comply with the minimum and maximum requirements. The luminous intensity distribution after one and after 10 minutes of operation shall be calculated from the luminous intensity distribution measured after photometric stability has occurred by applying at each test point the ratio of luminous intensities measured at HV:
(a) After one minute;
(b) After 10 minutes; and
(c) After photometric stability has occurred.
4.8.2.3.2. For all other lamps, the luminous intensities measured after 1min and after 30min of operation shall comply with the minimum and maximum requirements. Operation of direction indicator lamps shall be done in flashing mode (f = 1.5 Hz, duty factor 50 per cent). The luminous intensity distribution after 1min of operation can be calculated from the luminous intensity distribution after 30 min of operation by applying at each test point the ratio of luminous intensities measured at HV after 1 min and after 30 min of operation.
Measurement methods. 1.1. During photometric measurements, stray reflections shall be avoided by appropriate masking.
1.2. In case the results of measurements should be challenged, measurements shall be carried out in such a way as to meet the following requirements:
1.2.1. The distance of measurement shall be such that the law of the inverse of the square of the distance is applicable;
1.2.2. The measuring equipment shall be such that the angular aperture of the receiver viewed from the reference centre of the lamp is comprised between 10 angular minutes and one degree;
1.2.3. The intensity requirement for a particular direction of observation shall be deemed to be satisfied if that requirement is met in a direction deviating by not more than one-quarter of a degree from the direction of observation.
1.3. In the case where the device may be installed on the vehicle in more than one or in a field of different positions the photometric measurements shall be repeated for each position or for the extreme positions of the field of the reference axis specified by the manufacturer.
Measurement methods. 5.6.2.1. When photometric measurements are taken, stray reflections shall be avoided by appropriate masking.
5.6.2.2. In the event that the results of measurements are challenged, measurements shall be taken in such a way as to meet the following requirements:
5.6.2.2.1. The distance of measurement shall be such that the law of the inverse of the square of the distance is applicable;
5.6.2.2.2. The measuring equipment shall be such that the angle subtended by the receiver from the reference centre of the light is between 10′ and 1°;
5.6.2.2.3. The intensity requirement for a particular direction of observation shall be satisfied if the required intensity is obtained in a direction deviating by not more than one quarter of a degree from the direction of observation.
5.6.2.3. Measuring points expressed in degrees of angle with the axis of reference are shown in Annex 4, Figure A4-XII. The values shown in the table give, for the various directions of measurement, the minimum intensities in cd.
5.6.2.4. Horizontal and vertical angles for the field of geometric visibility are shown in Annex 4, Figures A4-XIII. The directions H = 0° and V = 0° correspond to the axis of reference. On the vehicle they are horizontal, parallel to the median longitudinal plane of the vehicle and oriented in the required direction of visibility. They pass through the centre of reference.
Measurement methods. 1.1. During photometric measurements, stray reflections shall be prevented by appropriate masking.
1.2. Should the results of measurements be challenged, measurements shall be carried out in such a way as to meet the following requirements:
1.2.1. the distance of measurements shall be such that the law of the inverse of the square of the distance is applicable;
1.2.2. the measuring equipment shall be such that the angular aperture of the receiver viewed from the reference centre of the light is between 10' and 1°;
1.2.3. the intensity requirement for a particular direction of observation shall be deemed to be satisfied if that requirement is met in a direction deviating by not more than 15' from the direction of observation.
1.3. In the case where the device may be installed on the vehicle in more than one or in a field of different positions the photometric measurements shall be repeated for each position or for the extreme positions of the field of the reference axis specified by the manufacturer. Annex 4
Measurement methods. 1.1. When photometric measurements are taken, stray reflections shall be avoided by appropriate masking.
1.2. In the event that the results of measurements are challenged, measurements shall be taken in such a way as to meet the following requirements:
1.2.1. the distance of measurement shall be such that the law of the inverse of the square of the distance is applicable;
1.2.2. the measuring equipment shall be such that the angle subtended by the receiver from the reference centre of the light is between 10' and 1°;
1.2.3. the intensity requirement for a particular direction of observation shall be satisfied if the required intensity is obtained in a direction deviating by not more than one quarter of a degree from the direction of observation.
1.3. In the case where the device may be installed on the vehicle in more than one or in a field of different positions the photometric measurements shall be repeated for each position or for the extreme positions in the field of reference axis specified by the manufacturer. Annex 3
Measurement methods. 5.6.4.1. Measuring points expressed in degrees of angle with the axis of reference are shown in Figure A4-XI.
5.6.4.2. Horizontal and vertical angles for the field of geometric visibility are shown in Figures A4-XII and A4-XIII. The directions H = 0° and V = 0° correspond to the axis of reference. On the vehicle they are horizontal, parallel to the median longitudinal plane of the vehicle and oriented in the required direction of visibility. They pass through the centre of reference.
Measurement methods. A meeting invitation letter for each meeting to include a mailing list (can be an email copy).
Measurement methods. A wide range of tools, techniques, metrics and assessment approaches that qualify or quantify the Function-Based Parameters. Each measurement method is assigned a category for Type, Level of Effort, Level of Complexity, and whether it is a Direct or Indirect measure. Refer to Chapter 4 and Appendix Ac for a comprehensive list of the measurement methods and their assigned categories.
