Delta LTL2000S Specifications Page 7

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DELTA LTL2000 Retrometer 1
SECTION 1
OPERATING INFORMATION
LTL2000 Introduction
The LTL2000 Retrometer is a portable field instrument, intended for measuring the retro reflection
properties of road markings in car headlight illumination, the value Rl (coefficient of retro reflected
luminance) is used. Rl is a measure of the lightness of the road marking as seen by drivers of motorised
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 corresponds to an observation distance of 30 metres. Thus
relevant for a motorist viewing situation under normal conditions.
The operation of the Retrometer is very simple and requires a minimum of instruction. An error message
or warning is given in case of unreliable or erroneous measurement.
The LTL2000 measures the retro reflection and calculates Rl according to international agreements.
Results are presented in plain English on a 16*2 character LCD display. The built-in printer and non-
volatile memory provides ON SITE registration of measurements with corresponding date and time.
Serial communication on RS232 port gives extended command, calibration, diagnostics and data dump
facilities.
Rl is an important factor in the ON-SITE quality control of road markings.
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