Page 2 - The information contained in this document is subject to change
DELTA LTL2000S(Q) Retroreflectometer i 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 ...
Page 3 - INDEX
DELTA LTL2000S(Q) Retroreflectometer ii INDEX SECTION 1................................................................................................................................ 1 INTRODUCTION.........................................................................................................
Page 5 - SECTION 1; INTRODUCTION; Introduction; blue
DELTA LTL2000S(Q) Retroreflectometer 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 propert...
Page 7 - Getting started; Measuring; Calibration; Warning and Errors; Status Display
DELTA LTL2000S(Q) Retroreflectometer 3 Getting started Buttons Measure Men u Ent er Hom e OFF Calibr ate Prin t Sc roll d own Sc roll up ON Measuring Turn the instrument on by pressing and holding the button until the LCD shows: Calibrate the instrument if necessary, see Calibration page 6 . Place t...
Page 8 - Wet night measurement considerations:; Press this key to enter the menu section. Press
DELTA LTL2000S(Q) Retroreflectometer 4 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: Wet night measurement c...
Page 10 - Rl Calibration
DELTA LTL2000S(Q) Retroreflectometer 6 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 ins...
Page 12 - Qd Calibration
DELTA LTL2000S(Q) Retroreflectometer 8 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 ca...
Page 13 - See Rl calibration page 6.; Figure 2. How to place the calibration normals.
DELTA LTL2000S(Q) Retroreflectometer 9 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 calibratio...
Page 14 - Remember; Keep protection window, light trap and calibration unit clean.
DELTA LTL2000S(Q) Retroreflectometer 10 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 dr...
Page 15 - SECTION 2; GENERAL INFORMATION; Rl Measurement; and the observation angle is 2.29
DELTA LTL2000S(Q) Retroreflectometer 11 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 vehi...
Page 17 - 1 2 3 4 5 H (mm)
DELTA LTL2000S(Q) Retroreflectometer 13 Figure 4: Simulation of profiled markings and/or un-even markings: Lift of a retrore-flectometer to a height H and the resulting R L values. H 0 1 2 3 4 5 H (mm) 500 400 300 200 100 0 R of a road marking L bea ms s epa ratin g
Page 18 - up to 5 mm profile height
DELTA LTL2000S(Q) Retroreflectometer 14 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...
Page 19 - Qd Measurement
DELTA LTL2000S(Q) Retroreflectometer 15 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 and reproducible meas-uremen...
Page 20 - Figure 7. Qd illumination system; Light source
DELTA LTL2000S(Q) Retroreflectometer 16 Figure 7. Qd illumination system 512 515 516 517 518 512 Road marking surface – Light source – Diffusing box with white interior finish 517 Thin perforated plate 518 Aperture into diffusing box
Page 21 - Instrument function
DELTA LTL2000S(Q) Retroreflectometer 17 Instrument function Physically the instrument is dominated by the “control tower”. The tower contains the Rl il-luminating and observation system and the control electronics. The unit on top of the base structure contains the Qd illumination system, the observ...
Page 22 - Note
DELTA LTL2000S(Q) Retroreflectometer 18 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 sh...
Page 23 - KEYBOARD, DISPLAY AND FUNCTIONS; Keyboard Layout
DELTA LTL2000S(Q) Retroreflectometer 19 SECTION 3 KEYBOARD, DISPLAY AND FUNCTIONS Keyboard Layout . . . . . . Figure 8. Keyboard. Keyboard functions Key Label Key Function Turns the instrument On . Hold activated until the sign on message appears in the Display. Turns the instrument Off . Terminates...
Page 24 - Clear log data; Measurement id
DELTA LTL2000S(Q) Retroreflectometer 20 Enter - Activates selected function, accepts changed settings and con- firms choices. Home (Home position) - Cancels selected function or menu and return to top control level displaying the latest measurement result. Outputs the latest measurement or calibrati...
Page 25 - Entering Measurement id:; Mean Calculation; Error! Can’t calc new; Menu system; Qd Mode
DELTA LTL2000S(Q) Retroreflectometer 21 Entering Measurement id: To enter / edit the sequence id press the button when in home position . Use the button to scroll through the alphabet in direction A..Z (starting with the space character), 0..9. The button will scroll through the alphabet in opposite...
Page 26 - the display one at a time using the; Explanation; The latest measurement results.; Rl Signal; The measured Qd signal level.
DELTA LTL2000S(Q) Retroreflectometer 22 the display one at a time using the keys. An * after a text means that the message only is shown at special occasions e.g. an er-ror or warning! LTL2000S(Q) Display Explanation ( The following messages are possible) R: 146 Q: 64 The latest measurement results....
Page 27 - Qd Stray L
DELTA LTL2000S(Q) Retroreflectometer 23 LTL2000S(Q) Display Explanation ( The following messages are possible) Qd Out of Limit* Qd Sig Overflow* Qd Stray L : 0 Qd High Stray L* VBat Qd : 11.3V Low VBat Warning* The Qd value exceeds the theoretical value of 318. See Rl Sig Overflow. The measured Qd s...
Page 29 - SECTION 4; MAINTENANCE; General care; Protection window; Keep dust/protection window and light trap clean
DELTA LTL2000S(Q) Retroreflectometer 25 SECTION 4 MAINTENANCE General care 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) ...
Page 30 - Lamp; Figure 9. Calibration units
DELTA LTL2000S(Q) Retroreflectometer 26 Fuses Fuses, two pieces, are placed at the rear of the instrument. The charging fuse protects the bat-tery against short circuit and other errors in the charging connector, charger or charging sys-tem. The battery fuse protects battery and electronics against ...
Page 31 - Figure 10. Light trap
DELTA LTL2000S(Q) Retroreflectometer 27 mild household detergent. 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). Fo...
Page 32 - Printer; thermal paper
DELTA LTL2000S(Q) Retroreflectometer 28 Printer The printer is a high speed high quality mini thermal printer. It has only a few moving parts and does not require any special or periodic maintenance. Paper specification: • thermal paper • width: 57.5 mm • diameter: 31 mm (max.) Replacing the paper i...
Page 33 - APPENDIX A; COMMUNICATION FACILITIES; RS-232C specification
DELTA LTL2000S(Q) Retroreflectometer 29 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...
Page 35 - Data protocol
DELTA LTL2000S(Q) Retroreflectometer 31 Connection example #2. PC with 9 pin D-Sub communication port. Cable connections: PC Port DTE pin name LTL DTE 1 CD X 2 RxD --- 2 3 TxD --- 3 4 DTR X 5 SG --- 5 6 DSR X 7 RTS X 8 CTS X 9 RI X 9-pin female D-SUB 9-pin male D-SUB As it can be seen, the interconn...
Page 36 - Command format
DELTA LTL2000S(Q) Retroreflectometer 32 Command format All LTL2000S(Q) commands are built using the following template. Command (one ore more letters) Delimiter (one ore more spaces, optional) Parameter (Integer or Real number, optional) Command End (Carriage Return, mandatory) Example #1: The user ...
Page 37 - The following commands have been defined; Command set
DELTA LTL2000S(Q) Retroreflectometer 33 Command set The instrument is equipped with a serial communication port primarily for log data acquisition, calibration and test, however all normal instrument functions can be controlled from this interface. The following commands have been defined Command se...
Page 40 - APPENDIX B; Status code interpretation; Rl Status code interpretation:
DELTA LTL2000S(Q) Retroreflectometer 36 APPENDIX B Status code interpretation Rl Status code interpretation: bit pattern value Description Status Code: 00000001 1 Error in Rl Result Status Code: 00000010 2 Stray Light Warning Status Code: 00000100 4 Log full Warning Status Code: 00001000 8 Not defin...
Page 41 - APPENDIX C; Print outs
DELTA LTL2000S(Q) Retroreflectometer 37 APPENDIX C Print outs Result Printout Examples of result printouts showing the measured values, the Measurement Id and the number of measurements with this id, the number of measurements used to calculate the mean value, the date and time the measurement was t...
Page 42 - Log Printout; Example of log printout from LTL2000SQ
DELTA LTL2000S(Q) Retroreflectometer 38 Note: The Calibration printout can only follow directly after a calibration with the key. Log Printout Example of log printout from LTL2000SQ The printout shows the instrument s/n, number of entries, number of free log entries, a data header and then all the d...
Page 43 - Status Printout; Menu
DELTA LTL2000S(Q) Retroreflectometer 39 Status Printout Example of status printout. The printout is done from the Menu system. 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 Instru...
Page 44 - SPECIFICATION; General Characteristics R; General Characteristics Qd; Field of measurement:
DELTA LTL2000S(Q) Retroreflectometer 40 APPENDIX C SPECIFICATION General Characteristics R l Illumination angle to the road ......................................................................................... 1.24º Observation angle to the road......................................................
Page 45 - Electrical Characteristics; Battery must be fully charged; Mechanical Characteristics
DELTA LTL2000S(Q) Retroreflectometer 41 Electrical Characteristics EMC ..................................................................................................................... EN 50081-1 EN 50082-1 Power supply: Battery.......................................................................
