AS NZS 1906.1:2017 pdf free download – Retroreflective materials and devices for road traffic control purposes
2.1 PHOTOMETRIC PROPERTIES
NOTE: Sheetings for motor vehicle number plates are dealt with in Section 3. When tested for photometric performance in accordance with Appendix A, a new clean test piece of a given class shall attain a R A value not less than that specified for the particular class as given in Tables 2.1, 2.2, 2.3, 2.4 or Table 2.5. This requirement shall apply at each of the entrance and observation angles listed in the tables and for each of the colours listed. The R A value in each case shall be the mean of the measurements taken at rotation angle e = 0° and e = 90°. Zero rotation angle shall be that indicated by manufacturers’ markings on the sheeting or in the absence of such markings, the rotation angle at which the R A is a minimum, shall be deemed e = 0°, when measured at a = 0.2° and b 1 = 15°. In all photometric specifications and test methods (with the exception of the rainfall test) in this Standard the value b 2 (see Clause 1.4.2.1) shall be zero.
NOTES:
1 Micro-prismatic sheeting may exhibit significant variations of performance with changes of rotation angle. It is important therefore that all such sheeting has either orientation markings on its face, or is supplied with instructions as to how it is to be orientated, and that all pieces of sheeting on any one sign are orientated in the same direction. Only pieces of sheeting whose R A varies by 10% or less with change in rotation angle should be used at different orientations on the one sign face e.g. a diamond warning sign.
2 A guide to the minimum desirable luminance contrast ratio between legend and coloured background on a sign having both legend and background reflectorized is given in Appendix B.
2.2.1 Measurement method
Colour measurement shall be carried out as specified in Appendix C by one of the following methods:
(a) The single monochromator method Except as specified in Item (c), this method shall be used to determine the CIE chromaticity coordinates and total luminance factor of the following:
(i) Non-fluorescent sheeting under daylight conditions.
(ii) Non-fluorescent and fluorescent sheeting under retroreflected light.
(iii) Fluorescent sheeting under daylight conditions subject to the purchaser being satisfied that the resulting measurements lie within the bounds of the CIE colour spaces and the daytime luminance meets visual expectations as well as the specified luminance factor (refer to CIE 20).
(b) The double monochromator method This method shall be used to determine the CIE colour coordinates and total luminance factor of fluorescent sheeting under daytime conditions as a referee method where the purchaser is not satisfied that the results of the single monochromator method accurately reflect the colour performance of the sheeting.
(c) The colorimeter method This method may be used as an alternative to the single monochromator method for the daytime colour and luminance factor measurement of non-fluorescent sheeting.