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Measuring procedure
Choose two comparison standards
whose values are close to the expected
retroreflection of the marking to be
tested. Insert them into the device
aligned on the left and right edge as
described above.
Press the light switch (1) during the
whole visual testing procedure and
observe the road markings to be
tested and the comparison standards
through the observation window (5).
View through the observation window (3)
Compare the retroreflection of
the marking with the
retroreflection of the
comparison standards and
decide if the sample has a
higher or lower retroreflection.
Choose further comparison
standards and repeat the testing
in order to receive more precise
results.
In the example at hand, the retroreflection of the marking is higher than of both
comparison standards. In this case, two standards with values over 150 mcd . lx
-1
.
m
-2
, could be chosen, e.g. 175 mcd . lx-1 . m-2 and 200 mcd . lx-1 . m-2, for a
second comparison to get preciser results.
observation
angle
Measuring direction
(observation direction)
Summary of Contents for ZVR 6000
Page 1: ...ZVR 6000 Visual Retroreflectometer RL Instruction Manual...
Page 2: ......
