Proceq Zehntner ZRM 6006, Инструкция по эксплуатации

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Page 28
11 Graphical illustration of the measuring principles
11.1 Night visibility R
L
R
L
is the coefficient of retroreflected luminance (night visibility) of road markings.
The observation angle of 2.29° corresponds to the viewing distance of a vehicle
driver of 30 m under normal conditions. The illumination angle is 1.24°.
The angle definitions above are valid for EN 1436. It is important to understand that
EN 1436 and ASTM E1710 use different illustration of the same angles.
11.2 Day visibility
Qd is the luminance coefficient under diffuse illumination (day visibility) of road
markings. The observation angle of 2.29° corresponds to the viewing distance of a
vehicle driver of 30 m under normal conditions. EN 1436 and ASTM E2302 use the
same angle definitions.