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LTL2000S / SQ RETROREFLECTOMETER
Manual
DELTA ⋅ Venlighedsvej 4 ⋅ DK-2970 Hørsholm ⋅ Denmark ⋅ Tel. (+45) 72 19 40 00 ⋅ Fax (+45) 72 19 40 01 ⋅ www.delta.dk
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DISCLAIMER The information contained in this document is subject to change without notice. DELTA LIGHT & OPTICS MAKES NO WARRANTY OF ANY KIND WITH RE- GARD TO THIS MATERIAL, INCLUD- ING, BUT NOT LIMITED TO, THE IM- PLIED WARRANTIES OF MERCHAN- TABILITY AND FITNESS FOR A PAR- TICULAR PURPOSE. DELTA LIGHT & OPTICS SHALL NOT BE LIABLE FOR ERRORS CONTAINED HEREIN OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, PERFORMANCE OR USE OF THIS
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INDEX SECTION 1................................................................................................................................ 1 INTRODUCTION............................................................................................................................. 1 Introduction ................................................................................................................................................... 1 LTL2000S(Q) features .......................
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APPENDIX C.......................................................................................................................... 40 SPECIFICATION........................................................................................................................... 40 General Characteristics R ........................................................................................................................... 40 l General Characteristics Qd........................................
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SECTION 1 INTRODUCTION Introduction This manual covers both LTL2000S and LTL2000SQ. Some functions will only be available on LTL2000SQ and will be printed in blue colour. The LTL2000S is a portable field instrument, intended for measuring the reflection properties of road markings “Rl” as seen in the vehicle headlight illumination. To measure the Rl properties (coefficient of retro reflected luminance) the road is illuminated at an angle of 1.24 deg. and the reflected light is
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Serial communication on RS232 port gives extended command, calibration, diagnostics and data dump facilities. The LTL2000S(Q) is powered by a rechargeable lead acid battery, giving several hours of measurement capacity. A mains powered battery charger is supplied as standard. LTL2000S(Q) features • Portable self-contained instrument • Measurement in full daylight • Automatic stray light compensation and error diagnostics • Dry and wet surfaces • Plane, textured & profiled marking
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Getting started Buttons Measure Menu Enter Home OFF Calibrate Print Sc roll down Scroll up ON Measuring Turn the instrument on by pressing and holding the button until the LCD shows: Retrometer Retrometer LTL2000SQ v1.6 2004-01-08 10:55 Calib
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scroll through the status list to see the possible cause of the problem. For further description on the error messages see Status Display page 19. Alternatively or select the menu Print Status to print a complete instrument status. Note: When battery voltage becomes low a warning (W) is shown in the lower right corner of display. It is still possible to take measurements but when the voltage drops too low, readings can be erroneous. If in doubt whether the readings are corre
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the Mean calculation function is enabled and there is more than 1 measurement in the calcula- tion then the number of measurements is shown first. Scroll Keys: In normal mode the key activates the Clear Top Log function, in menu mode it is used to scroll through the menu functions and to increment shown values. In normal mode the key activates the Edit Sequence Id function, in menu mode it is used to scroll through menu functions and to decrement shown values. For more information
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Calibration - LTL2000S A calibration should always be carried out before starting a new series of measurements. Calibration is done by placing the calibration unit underneath the instrument between the rails. The easiest way to place the unit is to tilt the instrument backwards. Figure 1. How to tilt the instrument. The calibration units are fitted with guidance pins on the outside. The pins mounted in the middle of the longitudinal direction of the unit shall fit in the notch in
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The display shows: Step 1 Step 2 Step 3 Step 4 Step 5 Mount Light Trap Zeroing Zero OK Mount Rl Normal Calibrating Please Wait Zero: 0.05% Please Wait when Ready when ready Step 6 Step 7 Step 8 Rl Normal 150 Rl Normal 150 Calibration Done Remove Normal = OK to Edit Wait = when OK To verify the calibration do a Rl measurement on the normal before removing the norma
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Calibration - LTL2000SQ A calibration should always be carried out before starting a new series of measurements. The LTL2000SQ is supplied with two calibration units. One for Rl and one for Qd. The order of R1 / Qd calibration is not critical. Qd calibration can be done before the Rl cali- bration and reverse. The Rl / Qd calibration can also be performed individually. The Qd calibration only consist of one calibration (no zero calibration is needed). Calibration is done by placing t
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If the key is pressed the calibration result is printed. In the example above the Qd function is now calibrated to a Qd value of 215. If an error is detected during the calibration procedure then the display will indicate this. Rl Calibration: See Rl calibration page 6. Rail Guidance pin placed in notch The normal must be placed with this side up for the different calibrations. Zero calibration for the Rl calibration (step 1 in the detailed de- scription page 5). Rl calibr
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Remember: Recharge battery when possible. Never leave battery discharged for longer periods of time. Keep protection window, light trap and calibration unit clean. LTL2000S(Q) is an optical precision instrument, handle with care. Store in clean and dry environment DELTA LTL2000S(Q) Retroreflectometer 10
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SECTION 2 GENERAL INFORMATION Rl Measurement The Rl part of the LTL2000S(Q) Retroreflectometer measures the Rl (coefficient of retro re- flected luminance) parameter. The Rl parameter represents the brightness of the road mark- ings seen by drivers of motor vehicles by headlight illumination. The illumination angle is 1.24 ° and the observation angle is 2.29 ° simulating a drivers view- ing distance of 30 metres at an eye height of 1.2 metres. The observation area is app. 45 mm. x
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The illuminations field with a length of 200mm length and 43 mm wide gives a large measur- 2 ing measurement field of 85 cm . Combined with an observation field of 350 mm length this gives a considerable capability to measure profiled and textures makings but also a high reli- ability for obtaining correct readings for un even surfaces or if small debris are present at one of the instruments support pads on the marking. Because of illumination at an angle of only 1,24° to the surface in
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beams separating R of a road marking L 500 400 300 200 100 0 0 1 2 3 4 5 H (mm) H Figure 4: Simulation of profiled markings and/or un-even markings: Lift of a retrore- flectometer to a height H and the resulting R values. L DELTA LTL2000S(Q) Retroreflectometer 13
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up to 5 mm profile height up to 20 cm profile gap Figure 5: The reach of the LTL 2000S(Q) makes it capable of measuring profiled road markings of profile height up to 5 mm, or profile gap up to 20 cm. The advantage of the DELTA optical arrangement with a smaller illumination field in a large measurement field is illustrated in the figure 6 below compared to a system with two identical fields. Pro profiled/textur
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Before tilt /shift of high position LTL2000 5 mm profile capability. Competitor < 0.5 mm profile capabilty After tilt/shift of high position LTL2000 5 mm profile capability. Competitor < 0.5 mm profile capabilty Area not measured Figure 6: The LTL2000S(Q) illuminations/measurement fields ( 5mm profile capabil- ity) compared to a system with identical fields (< 0.5 mm profile capability) clearly shows the advantage of the LTL2000S(Q) for obtaining reliable
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515 516 517 518 512 512 Road marking surface – Light source – Diffusing box with white interior finish 517 Thin perforated plate 518 Aperture into diffusing box Figure 7. Qd illumination system DELTA LTL2000S(Q) Retroreflectometer 16
