Delta PG-40 Specifications download pdf (Page 7)

DELTA LTL-X Retrometer 7

SECTION 1

OPERATING INFORMATION

LTL-X introduction

The LTL-X retroreflectometer is a portable field instrument intended for measuring the

retroreflection properties of road markings in car headlight illumination, the value R

(coeffi-

cient of retroreflected luminance) is used. R

is a measure of the lightness of the road marking

as seen by drivers of motorized vehicles in car headlight illumination. The road is illuminated

at an angle of 1.24 and the reflected light is measured at an angle of 2.29, which corre-

sponds, to an observation distance of 30 meters. This is relevant for a motorist’s viewing sit-

uation under normal conditions.

The operation of the retrometer is very simple and requires minimal instruction.

The LTL-X measures the retroreflectivity and calculates R

according to international agree-

ments. Results are presented in plain text on a large graphic display. Error messages or warn-

ings are shown in the display in case of any problems during use.

The built-in printer and memory provides registration of measurements with corresponding

date and time and other important data. The following data is also registered (if enabled):

is an important factor in the ON-SITE quality control of road markings.

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Delta PG-40 Specifications Page 7