Delta LTL2000S User Manual
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Delta LTL2000S User Manual

Retroreflectometer
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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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  • Page 1 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...
  • Page 2 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...

  • Page 3: Table Of Contents

    LTL2000S(Q) features ... 2 Getting started ... 3 Buttons... 3 Measuring... 3 Warning and Errors ... 3 Calibration - LTL2000S ... 6 Calibration - LTL2000SQ ... 8 SECTION 2... 11 GENERAL INFORMATION ... 11 Rl Measurement... 11 Qd Measurement ... 15 Instrument function ...
  • Page 4 APPENDIX C ... 40 SPECIFICATION... 40 General Characteristics R ... 40 General Characteristics Qd... 40 Electrical Characteristics ... 41 Environmental Characteristics... 41 Mechanical Characteristics... 41 DELTA LTL2000S(Q) Retroreflectometer...

  • Page 5: Section 1

    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.

  • Page 6: Ltl2000S(Q) Features

    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 •...

  • Page 7: Getting Started

    Status Display and then use DELTA Enter Home Sc roll down Scroll up button until the LCD shows: Retrometer 2004-01-08 10:55 key. to print–out the status from the last LTL2000S(Q) Retroreflectometer...

  • Page 8: Print Result

    Example: when taking measurements with the mean calculation on the first func- tion shown will be the Clear Mean function. Home: Press this key to terminate a menu or calibration and display the latest measurement result, if DELTA again to scroll through the menu structure. LTL2000S(Q) Retroreflectometer...

  • Page 9: Scroll Keys

    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 about the keyboard buttons please see page 19. DELTA LTL2000S(Q) Retroreflectometer...

  • Page 10: Calibration - Ltl2000S

    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.
  • Page 11 • Store the reference calibration unit in a dry and clean environment. DELTA Step 3 Step 4 Zero OK Mount Rl Normal Zero: 0.05% Step 7 Step 8 Rl Normal 150 Calibration Done Remove Normal = when OK key to print. LTL2000S(Q) Retroreflectometer Step 5 Calibrating Please Wait when ready...

  • Page 12: Calibration - Ltl2000Sq

    Step3 Qd Normal: 200 = OK to Edit DELTA Calibration = Qd = Rl Step 2 Calibrating Please Wait Step 4 Step 5 Qd Normal: 215 Calibration Done Remove Normal = when OK LTL2000S(Q) Retroreflectometer (see figure 2 page 9).
  • Page 13 Qd calibration (step 1 in the detailed de- scription page 6.) Figure 2. How to place the calibration normals. DELTA Guidance pin placed in notch The normal must be placed with this side up for the different calibrations. LTL2000S(Q) Retroreflectometer Rail Guidance pins...
  • Page 14 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...

  • Page 15: Section 2

    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.
  • Page 16 'Spotflex', Longflex', 'Rainline' and 'Drop-on line'. FOR MARKINGS EXCEEDING 5 MM HEIGHT/200 MM IN SPACING PLEASE CONTACT DELTA. DELTA . Combined with an observation field of 350 mm length this value is roughly constant up to the value. LTL2000S(Q) Retroreflectometer of profiled road...
  • Page 17 R of a road marking Figure 4: Simulation of profiled markings and/or un-even markings: Lift of a retrore- flectometer to a height H and the resulting R DELTA values. LTL2000S(Q) Retroreflectometer 5 H (mm)
  • Page 18 Pro profiled/textures markings, on even markings and in situations where a small debris (e.g. small stone) the instrument is lifted / tilted. The advantage of the LTL2000S(Q) optical ar- rangement is that the measurement still is correct in contrary to other systems available on the market with identical fields where the results obtained are incorrect because the illuminations field is not fully within the measurement field.

  • Page 19: Qd Measurement

    The very compact illumination systems in LTL2000SQ is a result of a considerable research effort at DELTA using advanced optical simulation programs. The patent pending illumination system is shown in figure 7. The re-...
  • Page 20 Road marking surface – Light source – Diffusing box with white interior finish Thin perforated plate Aperture into diffusing box Figure 7. Qd illumination system DELTA LTL2000S(Q) Retroreflectometer...

  • Page 21: Instrument Function

    The result and corresponding measurement id, time and date can be printed by the built-in printer. The LTL2000S(Q) is operated with a small keyboard located at the top of the Retroreflectometer. Further, Retroreflectometer con- trol is possible over a serial communication link (RS232).
  • Page 22 The LTL2000S(Q) is factory calibrated. Nevertheless start important measurements with a calibration. Study the Retroreflectometer status and error messages if any. See also Section 4 – Maintenance (page 25). When the battery voltage becomes low a warning is shown in the display (W). It is still possi- ble to take measurements but when the voltage drops further, readings can be erroneous.

  • Page 23: Section 3

    Take a measurement and show the result in the display. All relevant data is automatically stored in the data log for later print or dump to the communication port. Enter calibration menu. Follow the instructions in the display. DELTA SECTION 3 ..LTL2000S(Q) Retroreflectometer...

  • Page 24: Clear Log Data

    Clearing the top log will reset the mean calculation. Measurement id LTL2000S(Q) has a built in function to mark each measurement with a user defined name (sequence id) and a unique sequence number automatic generated by the instrument. The se- quence id and the sequence number will also be stored in the log.

  • Page 25: Mean Calculation

    Rl mode ON and OFF. When ON the instrument will perform a Rl measurement when • Status Display The results and status recorded during measurement and calibration can be shown in DELTA button when in home position. button to advance to the next position. You is pressed. is pressed. LTL2000S(Q) Retroreflectometer...
  • Page 26 An * after a text means that the message only is shown at special occasions e.g. an er- ror or warning! LTL2000S(Q) Display R: 146 Q: 64 Rl Signal: 143 Rl Out of Limit*...
  • Page 27 LTL2000S(Q) Display Qd Out of Limit* Qd Sig Overflow* Qd Stray L: 0 Qd High Stray L* VBat Qd: 11.3V Low VBat Warning* VBat idle: 12.6V Low VBat Warning* VBat Now: 12.8V Free Log: 744 Log Full* LTL2000SQ v. 1.6...
  • Page 28 Clear Mean (only shown if Mean function is ON) Press to reset the Mean calculation. When the Mean calculation is active Clear mean will be the first menu point. DELTA is required. to switch to edit Month, edit Date, LTL2000S(Q) Retroreflectometer will clear the log. In to start...

  • Page 29: Section 4

    The Retroreflectometer is constructed for outdoor use in ordinary good weather conditions. It will stand moist weather with wet roads, but caution must be taken against rain or splashes and dirt from traffic. The LTL2000S(Q) Retroreflectometer is an optical instrument and shall be handled as such. Avoid shock and vibration if possible.

  • Page 30: Fuses

    If the ceramics is stained, scratched or broken the calibration unit has to be replaced. In case of dust on the ceramics surface, clean gently with a damp soft cloth if necessary use a DELTA Rl calibration unit Ceramics Qd calibration unit LTL2000S(Q) Retroreflectometer...

  • Page 31: Light Trap

    To ensure reliable measurements, it is recommended that the calibration unit is periodically recalibrated to a traceable standard. DELTA Light & Optics offers calibration traceable to PTB (Physikalsich-Technishe Bundesanstalt). For information contact your distributor or DELTA Light & Optics.

  • Page 32: Printer

    Replacing the paper is easily done by opening the paper container with the little handle in the cover, just place the new paper role with a short paper tail hanging out at the top and close the cover with a firm push. Figure 12. How to replacing the printer paper. DELTA LTL2000S(Q) Retroreflectometer...

  • Page 33: Appendix A

    APPENDIX A COMMUNICATION FACILITIES RS-232C specification The LTL2000S(Q) is equipped with a communication facility that enables the use of a simple data terminal or an ordinary PC type computer for control of LTL2000S(Q) functions and for log data acquisition. The computer or terminal connects to the Instrument using a communication cable fitted with a 9 pin male D-Sub connector at one end and a 9 or 25 pin connector at the other end.
  • Page 34 1 FG 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 SG 8 DCD 20 DTR 25-pin fe- male D-SUB DELTA Signal Direction Data to LTL2000S(Q) Data from LTL2000S(Q) Signal Ground LTL DTE 9-pin male D-SUB LTL2000S(Q) Retroreflectometer...

  • Page 35: Data Protocol

    PC side. Please refer to your PC manual for further information. Data protocol The communication between the LTL2000S(Q) and the computer equipment takes place us- ing the following settings: Baud Rate ...9600 bit/sec.

  • Page 36: Command Format

    Ot 120 Automatic Off Timer = 120 sec If for some reason the communication fails or the command is undefined the LTL2000S(Q) responds with a question mark. <?> If the parameter lies outside the defined range for that parameter, the LTL2000S(Q) returns the present setting without any change.

  • Page 37: Command Set

    Log Full Warning Display Off None Qd: 123 (mcd/mý)/lx Qd Status Code: 0 00000000 2002 Aug 12 13:53:16 Rl: 33 (mcd/mý)/lx Seq ID : DELTA #3 DELTA Meaning Real time clock Date and time New Date (time unchanged) Elaborated instrument status...
  • Page 38 Lamp On: Lamp Off: New Rl_Sy_Leak: 2 None Rl Status Code 0 00000000 Qd Status Code: 0 00000000 None Seq ID: DELTA Meas in Seq: 3 TEST2 Seq ID: TEST2 Meas in Seq: 0 None 2002 Aug 12 13:59:37 10 02 25...
  • Page 39 Enable/Disable Qd function Calibrate Qd to n Enable/disable Rl Function Calibrate Rl to n Zero adjust Rl measurement Execute enabled measurements Query/Set Sequence ID Query/Set Time Turn instrument Off Query/Set Alarm for Low VBAT Query Battery voltage Query Voltage conditions LTL2000S(Q) Retroreflectometer...

  • Page 40: Appendix B

    High Signal with Lamp on Error High Signal with Lamp off Error Description Error in Qd Result Stray Light Warning Not defined Not defined Low Battery Warning Not defined High Signal with Lamp on Error High Signal with Lamp off Error LTL2000S(Q) Retroreflectometer...

  • Page 41: Appendix C

    Qd Calibration Printout The printout after a Qd Calibration measurement showing the selected Qd Normal value, the date and time for the calibration and the status for the measurement. DELTA LTL2000S(Q) Retroreflectometer...

  • Page 42: Log Printout

    “off” for that measurement. The printout is done from the Menu system. DELTA LTL2000S(Q) Retroreflectometer...

  • Page 43: Status Printout

    Example of status printout. The printout is done from the Menu system. DELTA Date and time for printout Zero adjust data Rl calibration data Rl measurement data Qd Calibration data Qd measurement data Voltage measurements Log status Error info Instrument info Firmware info LTL2000S(Q) Retroreflectometer...

  • Page 44: Appendix C

    Width ... 45 mm Length (typ.) ... 200 mm Min. reading (mcd·m ·lx Max. reading (mcd·m ·lx DELTA APPENDIX C SPECIFICATION General Characteristics R ) ...0 ) ... Typ. 2000 General Characteristics Qd ) ...0 ) ... 318 LTL2000S(Q) Retroreflectometer...

  • Page 45: Environmental Characteristics

    Construction: Housing ... Aluminium Keyboard... Plastic laminated Circuit boards... Epoxy glass Printer: Thermal paper ... width / dia. 57.5 mm / 31 mm DELTA Electrical Characteristics Environmental Characteristics Mechanical Characteristics LTL2000S(Q) Retroreflectometer EN 50082-1 90% capacity after approx. 5 hours...

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Ltl2000sq

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