SAE J587:2017 pdf free

SAE J587:2017 pdf free.License Plate llumination Devices (Rear Registration Plate llumination Devices)
AlI luminance measurements shall be made on a rectangular test plate of clean, smooth, matte white blotting paper or an equivalent material with a diffuse white surface. The test plate shall have a total reflectance factor of 85%±5% when measured in accordance with ASTM E179 (0/t ilumination/viewing geometry). The size of the test plate is shown in Figure 1 or 2, as applicable. For devices used on vehicles other than motorcycles, test stations shall be located on the face of the test plate as shown in Figure 1. For devices used on motorcycles, the test stations shall be located on the face of the test plate as shown in Figure 2.
The test plate shall be mounted in the position ordinarily taken by the license plate. The face of the test plate that is measured by the luminance meter, shall be pointed toward the luminance meter and located 2 mm from the plane of the license plate holder.
Luminance measurements shall be made with the optical axis of the luminance meter perpendicular to the test plate surface within ±5°. Measurements shall be recorded at each of the circular test station areas specified in Figure 1 or Figure 2, as applicable.
Calculate and record the ratio of the maximum to the minimum luminance over all specified test points. For test plates conforming to Figure 1, the average of the two highest and the two lowest luminance values recorded at the eight test stations shall be taken as maximum and minimum, respectively. For test plates conforming to Figure 2, the highest luminance value and the average of the two lowest luminance values recorded at the six test stations shall be taken as maximum and minimum, respectively.
Plastic materials used in the optical parts shall meet the requirements of SAE J576. Since some license plate ilumination devices are mounted in shaded or protected locations, attention is called to the section of SAE J576 which covers exposure time and conditions.SAE J587 pdf free download.