LTL-M User Man
Contents
1. 202 22 225 Mountine or the EL TESNMSySIeIE 25 DMT So OVERHEAD CAMERA EI OPER 27 Distance Measumne Instrument DMI oui ha Vor blade 7 Overhead BONIS ETE TELE MEASURING AND DATA HANDLINGQG ooi ce epos ita co tenia Pea eua ane eye aoro Poen e Eee rene 31 Me asurms withthe E LESNI System 2 ise sie in on E 31 Data Transi edat eroe eas un tis 31 SECTION A ER M 34 34 Gencal CA MT 34 Protection sesto bid 34 Sy taeda teas 34 I DuC 34 SOFI C ics 34 APPENDIX LTL M VEHICLE MOUNTING INSTRUCTIONS 0 0 cc cece cece cee eee cece ser 35 APPENDIX B MOUNTING OF THE DMI UNIT Distance Measuring 39 APPENDIC C MOUNTING OF THE OVERHEAD 4 APPENDIX D CEEAINGE2. VST EVs ener a uten 42 APPENDIX E CHANGE OF SENSOR FRONT GLASS dau 45 APPENDIX F fo Go ols MERE ehe CO UL Ee 47 APPENDIX G LIMITATIONS IN THE USE OF THE ETE M SYSTEM siicoceceeceseuscl asavnnitoneedaseiteagadasee ete 48 APPENDIX H SPECIFICA TONS aac ae URSI OMM ea MU LO EU 49 APPENDIX I THE DELIVERY rnea EO PINES ae IESU IU M 53 DELTA LTL M Retroreflectometer User Manual 5 SECTION 1 OPERATING INFORMATION LTL M introduction The LTL M retroreflectometer is a mobile field instrument intended for measuring the retroreflection properties of road pavement markings LTL M measures the value coeffi cient of retroreflected luminance and the DC Daylight Contrast as well as records the pres ence of RPMs Raised Pavement Markers also called road studs R is a measurement of the lightness of the pavement marking as seen by drivers of motorized vehicles in car headlight illumination at nighttime The daylight contrast is the contrast between the road surface and the marking seen by the driver at daytime RPMs are another means of guiding traffic at nighttime through small devices positioned on the road surface providing a strong retroreflec tion LTL M measures at traffic speed LTL M will provide 100 coverage of the ma
3. The following could be a reason for error messages e No movie available e Disk not connected e Corrupt data If this happens try to correct or push the return button and try again MEASURING AND DATA HANDLING Measuring with the LTL M system With the LTL M Sensor mounted on the vehicle and connected to the Processor and the pro cessor turned on the TabletPC can be turned on see Section page 9 10 for details The TabletPC connects to the processor wireless via Ethernet A calibration shall be performed before measurements are started see Section 3 page 19 21 for details Now prepare the LTL M system for measurement by entering Series ID and Users ID see Section 2 page 17 18 for details Taking to the road make sure the GPS has a fix to allow for recording of location and speed If the system loses the GPS fix during measurement LTL M will continue to record measure ment data and record location as if the vehicle continued to drive straight on When the GPS fix 1s reestablished the GPS will adjust to the correct location The button START Measurement 15 activated and turns yellow START Measurement will turn on the flash system but will not start logging the measurements The driver must make sure that the markings are within the Measurement camera field on the Main Page and that the Measure Distance is within 5 7 m 16 23 feet distance preferably within 5 5 6 5 m 18 21 feet If this is not the c
4. c Use a straight beam to ensure that this face is parallel to the vehicle side check with the wheel distances Figure 3 Mounting the fixture on the vehicle Ensure that the fixture 15 vertical in loaded condition and that the fixture mounting tube is orthogonal to the driving direction The fixture is welded or fixed with bolts to the vehicle in loaded condition Ensure that the side of the interface plate 1s vertical see figure 3 before welding the mounting tube on the bracket assy Also ensure using e g a straight beam that the flange of the mounting tube is parallel to the vehicle axis The flange of the mounting tube should not be mounted so it protrude the width of the vehi cle Adjustmenst of height of LTL M above road surface Locking screw Figure 5 Adjustment and ensuring fixations of the LTL M before operation DELTA LTL XL Retroreflectometer 37 Checklist for adjustment and ensuring fixation before operations of the LTL M figure 5 e Loosen the parts 7 screw 8 nut and 12 screw on figure 5 Place a level on the sensor hosing and adjust the housing so it s horizontal Tighten parts 7 8 and 12 e Adjust the height so the distance from the housing to the road surface is 100 mm 4 inch using screws shown on the upper figure of figure 5 When this is done tighten the locking screws APPENDIX B Mounting of the DMI Distance Measuring Instrument Unit The DMI is mounted on one
5. to 55 5 to 13 1 F Humidity Non condensing 3 9 External GPS If required the instrument can be fitted with an external GPS unit via USB connection 3 10 Video camera optional The LTL M system may be fitted with a video camera to record the markings during measurement The video image will be stored together with the measurement data 3 10 DMI Distance Measurement Instrument optional The LTL M system may be fitted with a DMI to record the driven distance supporting the build in GPS based system DELTA LTL XL Retroreflectometer 51 4 USE AND CONTROL 4 1 Touch Screen Control and use of the instrument shall be through the use of a touch screen on the GUI unit The following functions among others can be accessed Set up of the Sensor system Monitoring of the system Start and stop of measurements Enter remarks during meas urements View distance driven View the log Export the log 4 2 Multilingual The instrument shall have the self contained ability to output display menus and readings in English The instrument is prepared with the ability to offer output in selected oth er languages 4 3 Adjustment Options The instrument Sensor system is able to be adjusted in the following ways 4 3 1 Vertical angle Can be manually adjusted 4 3 2 Height Can be manually adjusted 4 3 3 Side Can be fixed at 0 and 1 5 angles 4 4 Data Recording The instrument Sensor system shall be able to take conti
6. Mark log texts Button 1 Town falu to mark the log If b 15 Dressed Calibration Before using the DMI unit it needs to be calibrated In the Tools tab select Calibrate DMI unit DELTA LTL M Retroreflectometer User Manual 27 rar 2715 07 28 M Main Page View Log Tools Run calibration Place the calibration target 6m In front of the LTL M Make sure tilt is adjusted 50 the target 15 visible n alignment ce the alignemt board 6m in front of and perpendicular to the completely within the board Syncronize flash Suncronize flash and LadITIET ad Sy Only needs to be done when new lamp unit 15 installed Calibrate DMI unit Synchronize the DMI sensor output Drive for a fixed lengt to perform the calibration Diagnostics Flash unit Lifetime hours left ID null null sk dq T1 T IEMPerature a Measurement unit In the popup dialog box enter the distance you want to drive for calibration It is recommend ed to choose a distance between 1 and 5 km 0 6 and 3 miles the longer distance the more precise calibration DMI calibration Press start and drive exactly the length entered and then press the stop button A new calibration has to be undertaken if conditions changes like when the wheel pressure changes or the DMI unit is being mounted on one of the other wheels DMI calibration DMI status Driven distance Your DMI unit is now calibrated
7. ns rd Run alignment syncronize Calibrate DMI unit Du for a fixed lengt to peri Diagnostics Flash unit Measurement unit Run Calibration It is recommended to calibrate the LTL M system minimum once daily or when the LTL M sensor is re installed Before Running a Calibration place the calibration target precisely 6 m 19 7 feet in front of the LTL M sensor Make sure that the windows in the sensor and the calibration tile in the calibration box are clean and undamaged Make sure the tilt is adjusted can be done from the tabletPC so the target is completely within the Measurement camera field on the tabletPC Main Page Make sure the Processor is turned on Enter or cor rect the calibration value stated on the calibration box The calibration box Push the Run calibration button and calibration is automatically done within 20 30 se conds If the calibration is successfully done the screen inform Calibration succeeded If the calibration fails a warning is displayed If a calibration fails and measurement are being taken the previous calibration will be used Possible reasons for calibration failure e The calibration box is not completely visible Adjust the position of the cali bration box and or the camera tilt Calibration box is too far away from the 6 meter 19 7 feet distance The calibration target is not perpendicular to the measurement unit The calibration target ce
8. Connect the interconnection box to the system 2 Connect the camera using the Ethernet cable 3 Mount the sensor on the side of the vehicle as you would when measuring and adjust the tilt to 6 m 19 7 feet Place the car so a road marking 1s visible in the measurement field Press the Adjust overhead video camera 6 You will now see the following image of Width XXXX em DC XX XX ime 12 45 25 am 5 423 km 7 The picture shows a live image from the overhead camera with video overlay of measurement data 8 Next step is to locate the measurement field 6 m 19 7 feet ahead This is made by ei ther measuring 6 m ahead of the front end of the Sensor box as when a calibration is made or otherwise locate the flash light The mark is a green line across the picture 9 Press on the screen of the overhead camera picture to place the green bar exactly on the measurement field as measured 10 Press the Close button once done It will take a few seconds to exit 11 The overhead video will now automatically record when the log is recording To prepare for export of the movie access the View log page Choose the series you want to export chose the Average every you want displayed To export the movie connect a USB hard disk to the LTL M processor USB port and press the Export movie button in the View log page Make sure you set the averaging length to the required value Repeat for additional series you want to export
9. Help T E E Qesk 7 eah Folders 5 Folder Sync Address 1 Right Horth Get pictures from camera or scanner View show Order prints online Print pictures 83 Copy al items to CD File and Folder Tasks LJ Make a new folder Publish this Folder to the Web Other Places LTL M IF My Pictures M My Computer e amp My Network Places zi chart png data tat Details Opening data in Excel To open data in Excel the following procedure has to be followed e Right click with mouse on the file name e Open with e Excel Data are now opened in Excel n om Rm one ven oco RE NF dA V deam P 70 D a uM n d ane ci NM eid arpi E 5 Data DC daylight contrast markings width number of working RPMs and GPS ordinates can be seen Transfer of video to PC The external hard disk is inserted in the USB port on the Processor and the Export movie button is pushed to transfer data Preparing of the transfer may take up to one minute Trans fer of data may take from several minutes to a few hours depending on the amount of video to be transferred Opening video on PC After completing the movie export the external USB hard drive can be unplugged from the LTL M The
10. Measuring Instrument The DMI is an instrument which via one of the vehicle wheels measures the driven distance When installed and turned on see instructions below the distance measurement comes from the DMI and not from the build in GPS This secures a constant accurate distance measure ment also when poor or no GPS connection 15 obtained Once the DMI unit and the interconnect box is connected to the LTL M system it can be ena bled in the Settings tab by pressing Enable DMI unit The Quadrature encoder connected should be enabled for the DELTA DMI unit It should only be disabled if a third party non quadrature encoder is connected Positive and negative signal connected should be enabled for the DELTA DMI unit It should only be disabled if a third party encoder that does not provide inverted signal is con nected Error detection of the DELTA DMI unit is disabled if this option is unchecked M cad Main Page View Log Li ke ILU Overhead camera Enable overhead camera recording disable videi eELUOF Tig 20 Camera Adjust overhead ent field position video camera ad video Distance Measurement Enable DMi unit Uneh PS for dist F mia if ary T add anse measureme ta use ty Quadrature encoder connected MENECER I pulse Positive and negative signal connected Error detection Tor DMI will be disabled only positive signal
11. Print 7 Zip gt 31 Edit with Notepad Open With i Notepad i Hg Workbench oO Microsoft Visual Studio 2010 2 TortoiseHg b LibreOffice Calc LibreOffice Writer Scan for threats W Microsoft Visual Studio 2005 Tools for Applications 38 Add to archive Fa Microsoft Eu 38 Add to data rar A WordPad S Compress and email W Microsoft Word 3 Compress to data rar and email Winzip Choose Program Send To b Cut Copy Create Shortcut Delete Rename Properties The Export movie button is used to transfer the overhead video to USB stick or an external USB hard disk recommended Insert the USB hard disk in the USB port on the LTL M pro cessor NB not the USB port of the tabletPC Once the hard disk has been identified press the Export movie button and the video from the chosen measurement series will be trans ferred to a new folder on the hard disk The tablet PC will inform when the transfer has been successfully carried out and the USB hard disk can be removed The exported movie is a compressed video file encoded with the DivX codec To view the movie open the file with a suitable video player for instance VLC player from VideoLan but many other programs will properly also support the codec and play the file TOOLS PAGE In the Tools Page the below mentioned functions can be carried out ws 777 Main Page Tools Run calibration gape wal ji
12. bea 8 Important Guidelines for the Correct Use of the lA SECTION a ee 14 GENERAEINEORNDEA EIN 14 derriera 14 14 Notes on Error us 14 Environmental CONGIMONS veo ors aute tenor bo 15 SEC HON sm cc 16 THE USER INTERFACE 16 roduc hon eth mea OR 16 MAM 16 18 gs eee Roe 18 MEW TOS DE taeda otek ere tee 19 TOOR POP ud cuentos doa EINE dU sa naw el ween LEA RI 20 RECINTO TE CO OD DL 22 FITTING AND MOUNTING OF THE LTL M 5 8 25 Fitting the Mounts of the LTL M System on the
13. easy mounting next to the vehicle driver With fittings mounted on the vehicle the Sensor system can be mounted and demounted within 5 min 3 3 Power Source The instrument shall receive power from the car 12 V battery The instrument will require 13 5 A for operation Permanent 3 4 Dimensions The instrument s physical dimensions excluding any detachable folding or ex tending parts shall be 3 4 1 Sensor system 19 7 x 7 1 x 7 9 inch 500 x 180 x 200 mm 3 4 2 Processor 16 0 x 6 8 x 8 0 inch 400 x 170 x 200 mm 3 4 3 GUI 11 6 x 7 2 x 0 6 inch 290 x 180 x 15 mm 3 5 Weight The weight of the Sensor system will be 12 5 kg 28 165 The weight of the Processor system will be 8 kg 18 Ibs The weight of the GUI will be maximum 1 0 kg 2 2 Ibs 3 6 Compliance and Technical Standards The instrument shall comply with the following Directives 3 6 1 2004 108 EC EMC Directive 3 6 2 2004 104 EC Automotive Directive 3 6 3 2006 95 EC Low Voltage Directive 3 6 4 ROHS Compliance to the requirement of and its exception Directive 2002 95 EC 2002 96 EC Annex 1A The instrument shall comply with the following technical standards over and above what is men tioned in paragraph 1 1 Geometry 3 6 5 EN 61326 2007 EMC 3 6 6 ISO 7637 2 2002 Low Voltage 3 7 Tightness The Sensor system shall meet the IP 65 protection level 3 8 Operating conditions Temperature Operating 0 to 45 32 to 113 F Storage 15
14. icons page access can be located on the upper part of the TabletPC screen Main page rm The main page 1s where the LTL M system is being operated from and where the user can observe the measurement results and other parameters related to the measurement The main page also allows the user to adjust the sensor and add marks to the log Before the user can start measuring he or she needs to enter information on the road Series ID to be measured and the user Users ID See the section on Main Page on page 16 17 for details Series ID Before measurement can be initiated a Road ID need to be entered Information on the road like name direction side and length may to be entered for further road identification See the section on Series Page on page 18 for details Users ID Before measurement can start information on the user need to be entered See the section on Users Page on page 18 for details View log In View log the measurement results are being presented as a graph together with fig ures for maximum minimum and average readings as well as standard deviation The user can change the average length displayed to his or her desire This is also the page where log data and videos are exported See the section on View Log Page on page 19 20 for details Tools The Tools page is used to run calibration run system alignment synchronize the flash when changing the lamp and calibrate the DMI unit The page also contain
15. of the vehicle wheels to provide accurate distance measurement The DMI unit consists of a plate an encoder 3 4 wheel locks and a pole to be fixed to the side of the vehicle The DMI is connected to the interface box inside the vehicle by a cable The wheel locks are available in standard sizes 17 19 and 21 mm The plate 15 available in two sizes depending on the size of the vehicle wheel The DMI has to be mounted on one of the wheels of the vehicle Depending on the design and size of the vehicle wheels and number of bolts used to fix the wheel the wheel locks has to be mounted as shown below LTL M bolt patterns description for DMI For 4 bolt pattern use 1 3 5 and 7 For 5 bolt pattern use 1 4 and 6 For 6 bolt pattern use 2 5 and 8 DELTA LTL XL Retroreflectometer 39 The wheel locks are fixed to the wheels bolts by first loosening the central knurled finger nut mounting the wheel locks over the fix it by tightening the central knurled finger nut When the DMI is securely fixed to the vehicle wheel the pole and fixation cup is mounted to the vehicle so the pole can move smoothly up and down The DMI unit is now ready to be calibrated and used APPENDIX C Mounting of the overhead camera Mount the overhead camera on the inside of the vehicle windshield using the mounting gear provided with the camera Mount the camera as high up as possible to provide the best possi ble view of the markings and the
16. road Connect the camera to one of the Ethernet ports on the interface box for power and movie transfer The cable delivered with the camera system can only be mounted correctly Overhead camera mounted seen from the outside Example of video with data overlay DELTA LTL XL Retroreflectometer 41 APPENDIX D Change of lamp system Caution The Flash unit is a high voltage component so please disconnect all cables Unscrew the four marked screws at the back of the sensor Pull slide out the instrument of the box DELTA To remove the flash unit unscrew the three marked screws LTL XL Retroreflectometer 43 oh er 7 i 1 int Vr miu us nia E JJ Fj the in P 1 2 lift the end and remove the flash unit Assemble in reverse order Remember to synchronize flash align and calibrate after installing new flash unit See Section 3 Tools page 20 22 for details APPENDIX E Change of sensor front glass Unscrew the 4 screws Torx 20 Be careful n E ot t Place the window assembly on the table DELTA LTL XL Retroreflectometer o drop 45 Remove the gasket Remove the window be careful 1f the window 15 broken Check the gasket before replacing new window change if damaged Assemble in reverse order APPENDIX F Error messages If parts of the LTL M system do not function according to specif
17. the Synchronize flash button a series of flashes will take place and the synchronization is automatically done MAKE SURE THIS IS THE FIRST THING YOU DO AFTER CHANGING THE LAMP SYSTEM Synchronization may take up to 2 minutes Now Run Alignment as previously described followed by a calibration Calibrate DMI unit See DMI section page 27 29 for details Diagnostics Diagnostics contains a number of diagnostics information like flash unit expected remaining life time temperature information voltages and software versions The information on flash unit expected remaining life time tells how many hours the flash system is expected to last before a change is recommended SETTINGS PAGE In the Settings page it 1s possible to adjust the following Maln Page Main Metric units RL center value Preview gain 4 Mark log texts Button 1 Town Button 2 Missing Button 3 Water hice n tton 4 15 pressed Metric unit Switch between Metric and US units by checking unchecking the right side field R center value Switch between full line Rr value and center line Ry value by checking unchecking the right side field The LTL M system is standard set up to measure the full length and width of mark ings If the user wants to compare LTL M values with Ry values measured with a handheld retroreflectometer the center value option can be chosen for direct comparison Preview gain Preview gain adju
18. Interface The GUI 15 an Android based tabletPC to be mounted next to the driver The GUI performs the following functions Instrument configuration and control e Measurement configuration and control Log viewing Log readout to USB drive hard disk The main page of the GUI can be viewed below GPS status and speed Page icons Measurement camera picture Measurement distance information Birt Junction 14cm 14cm 306 2 96 Measure diStance Graph pr sentation Mark log R daylight contrast Start and stop of mea and adjustment of measurements buttons and marking width surement and logging MAIN PAGE GPS status and speed The GPS status field informs about the quality of the GPS signal and the speed of the vehicle calculated by the GPS The color of the icon shows the quality of the position GOOD fix e The GPS HDOP Horizontal Dilution Of Precision value is below 5 FAIR fix e The GPS HDOP value is larger than 5 but the GPS can FIX NO fix 9 The GPS cannot FIX weak or no signal The actual number of satellites connected is shown The speed can be displayed in kph kilometer per hour or mph miles per hour Adjustments of the speed unit can be made on the Settings Page Page icons Each of the six Pages can be accessed by a click on the corresponding icon Measurement camera picture The Measurement camera window shows a picture of the actual measurement field The window guides the dr
19. and you can start using the DMI to measure distance Press close to close the popup window Overhead Camera The overhead video camera is mounted inside the vehicle windshield and will provide a view of the entire road for later review The recording from the overhead video will not be dis played during driving but will be stored by the processor and can be reviewed later together with the measurement results to help explain the measurement results The video is synchro nized to the measurement data The video comes with measurement results overlayed see an example below The overhead camera is enabled the Settings page under Enable overhead camera record 99 it Main Page Sers view Log Overhead camera Enable overhead camera recording Uncheck to disable video recording from overhead camera Adjust overhead video camera Adjust measurement field position of overhead video Distance measurement Enable DMi unit TERT GF I measurement Quadrature encoder connected ncoder Positive and negative signal connected Error detection will be disabled If only positive signal conr Mark log texts Button 1 Town T LEMI DELTA LTL M Retroreflectometer User Manual 29 Once the camera is installed in the vehicle the Adjust overhead video camera can be used to place the outline of the measurement field in the overhead video To adjust the measurement field positions do the following 1
20. ase the Tilt Pos buttons T are used to adjust the camera up or down to focus the distance at ideally 6 m 19 7 feet The LTL M system is now ready to start logging measurements This 1s done by pushing the START Logging button which turns yellow Data on DC markings width number of working RPMs GPS coordinates and the driven distance is recorded If the driver wants to stop logging during driving he pushes the STOP Logging button and it turns white To resume logging push START Logging The LTL M system does only log road data when the logging function has been activated To be able to separate different road stretches if this is required enter a new Series ID for each road stretch If the driver during logging wants to mark specific road stretches he can use the eight Mark Log buttons The Mark Log buttons can be individually defined see Section 2 page 21 for details One Mark Log button can be activated at a time The LTL M system does not have an inactivity timer to automatically turn it off if a file log has not been activated In order to preserve the life of the lamp system the user has to press the Stop Measurement button when not using the system The LTL M Processor has large capacity to store data but a slowdown of the system may happen if too much data 15 stored as one Series ID DELTA recommends keeping a measure ment series at maximum 2 days of work to reduce the risk of slowing down freezin
21. at installation Side ofsett angle is set between 0 and 1 5 degress by 180 degrees rotation Figure 1 LTL M standard mounting assembly The standard mounting assembly supplied with the LTL M consists of two assemblies for mountings on each side of the vehicle Each assembly consists of a Mounting tube 3 two Mounting Brackets Assembly 4 and two sets of Mountings Brackets Assembly 5 The LTL M is mounted on the Mountings fixture 2 which has the Interface plate 1 to the LTL M mounted with M8 bolts 12 The off set angle can be changed from 0 to 1 5 degrees by removing the bolts 12 and rota tion of the interface plate by 180 degrees The characters on the top of the interface block R 1 5 L 0 indicates that if this side is up and the LTL M is mounted on the right side of the vehicle the offset angle is 1 5 degrees If mounted on the left side the offset angle is 0 de grees DELTA LTL M Retroreflectometer User Manual 35 Distance from mad to yellow sonia housing 5 100 mm in loaded condilion G0 F mam Figure 2 Mounting height of LTL M The distance from the yellow sensor housing of the LTL M the road surface should be set at installation to 100 mm 4 0 inch when the vehicle is loaded The centerline of the mounting tube should be approx 190 mm 7 5 inch above the road surface Insure that this side is verical at installation before welding or dovel pin fixing
22. cleanliness of the windows should be checked at regular intervals during driving to se cure free flow of light Be especially aware when measuring on wet surfaces splashing of water dirty roads dust or mud or when many insects are in the air Mounting of the sunshade in front of the sensor reduces the risk of splashes and dirt on the windows by creating over pressure during driving Calibration When mounted the LTL M system needs to be calibrated before measurements are initiated using the supplied calibration box to ensure correct measurements It is recommended to cali brate at least once a day or when the LTL M sensor is being re mounted See the calibration section on page 20 21 for details Taking measurements Measurements are taken at vehicle driving speed At speed up to 90 kph 55 mph LTL M will measure 10046 of the markings At higher speed the measurement coverage will be less than 100 depending on the speed LTL M measures an area of x 1 meter 3 x 3 feet During driving make sure the markings are within the measurement camera field the exact position of the markings during driving can be followed on the TabletPC Turning on the LTL M system LTL M can be run by the vehicle 12V battery preferably connected directly to the vehicle bat tery at the terminals Do only turn on the LTL M system processor after the vehicle en gine has been turned on as the turning on of the vehicle may remove the power supply shortly dur
23. coming with the lamp system After a lamp alignment and standard calibration of the instrument carried out through the tabletPC the measurement activities can be resumed 7 WARRANTY 7 1 Warranty Period The instrument shall be warranted for a period of two years against defec tive parts and workmanship APPENDIX The delivery The LTL M base system Two carrying cases on wheels with The Sensor and protecting cap Processor and calibration box Alignment board TabletPC with holder and charger DELTA LTL XL Retroreflectometer 53 Two sets of vehicle attachment fitting with attachment tube and angle adjuster re 1 Two cables ADD ONS Interface box Overhead camera DMI Three cables
24. decision what average length to display can be taken both before and or after the measurements have been done Information on maximum minimum and average Ry values and standard deviation are listed FS q a m Jyliand i 250 Beton 200 150 Beton Beton Average every 358 Update chart Urban 2 Nori 25 147 Export movie oren Stdv 39 Urban Round AVg 226 Export to USB The update chart button us used to update the graph after having chosen a Series and the aver age length to be displayed The chosen Series can be seen in yellow to the left of the page An average between 1 m 3 feet and indefinite may be chosen DELTA LTL M Retroreflectometer User Manual 19 The Export to USB button is used to transfer data to a memory stick Insert a USB stick on the right side of the tabetPC or in the LTL M Processor Once the stick has been identified press the Export to USB button and data from the chosen measurement series and an image of the graph will be transferred to a new folder on the USB stick The tablet PC will inform when the transfer has been successfully carried out and the USB stick can be removed The data txt file can be opened in Excel or similar spreadsheet Taking Excel as an example open the data folder on the USB stick Right click on data txt select Open With and choose Excel as shown on the picture below
25. ed to run approx 1 500 hours The LTL M system has a build in warning when 1 500 hours has been reach and a change of lamp is recommended The build in warning flash time left can be seen on Tools Page Flash Unit Cleaning Cleaning of the LTL M system sensor processor and calibration target can be done with a moist cloth No high pressure cleaning is to be used Storage The instrument system The LTL M instrument system 1s recommended kept in the transportation boxes when not in use Make sure the parts are clean and dry when stored The calibration target The LTL M instrument calibration target is recommended kept in the transportation boxes when not in use Make sure the parts are clean and dry when stored It is recommended to have a re calibration of the calibration block done every 1 2 years or when the block has become dirty or is damage beyond cleaning or repair The alternative to re calibration 1s to change the calibration block Contact DELTA or our local dealer for fur ther information APPENDIX A LTL M Vehicle Mounting Instructions This appendix describes the procedures for mounting the LTL M Retroreflectometer on a ve hicle _Parts List DESCRIPTION 3 11 a ta 0407 MB x 16 Hex Head 7 4 504017 8 30 30 Parallel Pin 8 60 Hex Head oe pin fixing at installation welding or dowel pin fixing
26. ent shall have a depth ability which enables the instrument to accurately measure profile pavement markings in accordance with profile height depth of up to 1 inch 25 mm 1 7 Measurement Fields The instrument shall utilize an observation field that is fully contained within the illumination field The instrument shall measure the retroreflection of an area of 39 4 inch 1 000 mm in length by 39 4 inch 1 000 mm in width 1 8 Measurement Data The instrument measurement shall include the following data 1 8 1 Retroreflectivity RL Average values between 3 feet 1 meter and unlimited length 1 8 1 1 The repeatability of measurements taken with the instrument shall be within 3 95 confidence 1 8 1 2 The reproducibility of measurements taken with the instrument or other like instruments shall be within 5 95 confidence 1 8 1 3 The trueness of the instrument compared to reference instrument LTL X 15 lt 5 as an average over 100 m marking measured 95 confidence 1 8 1 4 The measurement system shall be providing True Visibility date i e an exact picture of what a driver in a standard vehicle would see when driving on the same road at nighttime DELTA LTL XL Retroreflectometer 49 1 8 2 Daylight contrast 1 8 3 Presence of RPM s Raised Pavement Markers 1 8 4 Marking geometry Marking length and edges 1 8 5 Single lines double lines individually measured 1 8 6 GPS coordinates of measurement location w
27. exported movie is a compressed video file encoded with the DivX codec To view the movie one has to open the file within a suitable video player for instance VLC player from VideoLan but many other programs will properly also support the codec and play the file Deletion of data from Processor Data stored the processor can be deleted in two ways e Delete a Series ID on the Series page e Delete a User ID on the Users page DELTA LTL M Retroreflectometer User Manual 33 SECTION 4 MAINTENANCE General care The retroreflectometer 1s constructed for outdoor use in ordinary weather conditions IP 65 It will stand moist weather with wet roads The LTL M retroreflectometer is an optical in strument and shall be handled as such Avoid shock if possible Protection windows The protection windows on the Sensor are accessible from the front of the instrument The windows should by cleaned using a soft cloth and some window cleaning liquid Keep the windows clean at any time If the windows are scratched or broken they need to be changed See Appendix E for details Note If the protection windows are dirty or damaged it will have a direct effect on the measurement result Note Make sure the window is clean at time of calibration or wrong calibration will be made Lamp system The lamp system as such does not need maintenance but need to be changed when the system comes to an end of its lifetime The lamp system is estimat
28. f We help ideas meet the real world d LTL M MOBILE RETROREFLECTOMETER User Manual Mobile quality control of road markings in accordance with CEN ASTM specifications DISCLAIMER The information contained in this document is subject to change without notice DELTA MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS USER MANUAL THE USER OF THE MANUAL IS SOLELY RESPONSIBLE FOR ANY USE OF THE MANUAL AND THE INSTRUMENT DESCRIBED THEREIN WHICH HE CHOSES TO MAKE DELTA DOES NOT WARRANT THAT INSTRUCTIONS OR RECOMMENDATATIONS PROVIDED IN THE MANUAL COMPLY WITH LAWS REGULATIONS OR SAFETY STANDARDS IN THE JURISDICTION OF USE AND DOES NOT KNOW IF THEY DO TO THE LARGEST POSSIBLE EXTENT PERMITTED BY LAW DELTA DISCLAIMS LIABILITY FOR ERRORS IN THE MANUAL AND FOR ANY DIRECT INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMMAGES RELATED TO THE FURNISHING OR USE OF THE MANUAL AND THE INSTRUMENT DESCRIBED THEREIN Updated November 2011 Version 1 05 English Visit our web site www roadsensors com DELTA LTL M Retroreflectometer User Manual TABLE OF CONTENTS SEC TION T ot min re CE OT ee 6 OPERATING INEORIVEAT ION E 6 E TEZNDInttoductiol PLA E elon 6 LTL M Retroretlectometer Features uoo et I RR cq EN REA Red 8 RDP ONS 8 Getme SPIELE ase Molle ee
29. ficient of retroreflected luminance of pavement markings 1 MEASUREMENT PARAMETERS 1 1 Geometry The retroreflectometer instrument shall be constructed to simulate the driver ob servation angle found at a 30 meter distance from the marking and in accordance with ASTM E 1710 1 1 1 Entrance angle of 88 76 degrees 1 1 2 Observation angle of 1 05 degrees and in accordance with EN 1436 1 1 3 Entrance angle of 1 24 degrees 1 1 4 Observation angle of 2 29 degrees The instrument measures the retroreflection 6 m ahead of the measuring sensor 1 5 scaled CEN ASTM geometry 1 2 Illumination and Detection The instrument has a spectral response according to the V lambda distribution and the illumination has a spectral emission according to standard illuminant D65 as defined in ISO CIE 10526 1 3 Working Range The instrument shall have a working range of 0 to 2 000 mcd Ix for Rx 1 4 Marking Types amp Conditions The instrument shall be capable of measuring retroreflection on white and yellow markings and on planar flat and profiled textured markings under dry and wet conditions The instrument shall be capable of compensating for sunlight and stray light al lowing for full daylight measurements 1 5 Marking Size The instrument shall be measuring markings of a length of more than 1 000 mm Markings of a width of less than 500 mm and more than 90 mm shall be measured 1 6 Depth Ability Profile Markings The instrum
30. g of the system or getting error messages If measurements are kept as more series this should not happen Data handling and transfer The LTL M processor automatically stores all measured data and video DELTA LTL M Retroreflectometer User Manual 31 Data handling on the TabletPC When the measurements are finished the logged data must be transferred to a PC using USB memory stick and the video transferred using en external hard disk The data to be transferred a Series ID is to be selected and the average distance to be reported from 1 m 3 feet to indefinite is to be set This is done in View Log under Average every Main Page Jylland Beton Beton Beton Urban 1 Max 358 Update chart Min 147 Urban 3 TUM Urban 2 Export movie Urban Round Avg 226 Export to USB Transfer of data to PC When the Series ID and average has been chosen the Update chart button has to be pushed for data update The USB memory stick is inserted in the USB port at the right side of the TabletPC the port 15 hidden or in the processor and the Export to USB button 15 pushed to transfer data Opening data on PC The measurement data can now be transferred to a PC When opening a file from the USB memory stick do the following e Open the file you want to view e Open the chart or the data folder Data are opened in a text file Urban 1 Right_North i E gt Edt View Favorites Tools
31. ications the system will put out error messages A list of error codes are listed below TO BE COMPLETED DELTA LTL XL Retroreflectometer 47 APPENDIX G Limitations in the Use of the LTL M System Low retroreflective road markings LTL M has a cut off value of retroreflection levels of approx 40 med Ix m This means that a poor quality marking of less than this value will not be registered as a marking Sun directly into the lens If the sun enters the lens directly like at sunrise and sunset LTL M will not be able to measure correctly Strongly reflective markings and road surfaces If the road surface gives a very strong retroreflection in itself it may affect LTL M s ability to measure markings correctly due to oversaturation of the LTL M system te RPM Filter 2 Culperry Rd 0 230 2800037 RPMs of a CIL value less than 0 14 cannot be registered LTL M has a CIL cut off value of 0 14 being 2 of the minimum value of new white RPMs according to EN 1463 This means that poor quality RPMs below the cut off value will not be registered as a RPM Measuring during rain LTL M will not be able to measure during rain Measuring on wet roads LTL M has not been tested measuring on wet roads When roads are wet there is a high risk of splashing on the Sensor windows reducing the amount of light going out and the amount of light being registered by the camera APPENDIX H Specification for Retroreflectometer for determining the coef
32. ing ignition In such case the LTL M processor may be corrupted and need DELTA to reinstall the software The LTL M system require approx 13 5 A to operate To safeguard the battery supply it is recommended to have an extra battery installed in the vehicle The LTL M system will draw the power from the extra battery which again is con nected directly to the vehicle generator Remember LTL M is an optical precision instrument handle with care Keep the protection window and calibration unit clean Store in a clean and dry environment when not in use Remember turn on the Processor only after the vehicle engine has been started if an extra battery has not be installed DELTA LTL M Retroreflectometer User Manual 13 SECTION 2 GENERAL INFORMATION The measurement The LTL M retroreflectometer is a mobile field instrument intended for measurement of the retroreflection properties of road pavement markings LTL M measures the value coeffi cient of retroreflected luminance and the DC Daylight Contrast as well as record the pres ence of RPMs Raised Pavement Markers also called road studs or cat eyes Rr is a meas urement of the lightness of the pavement marking as seen by drivers of motorized vehicles in car headlight illumination at nighttime The daylight contrast is the contrast between the road surface and the marking seen by the driver at daytime RPMs are another means of guiding traffic at nighttime
33. it the measurement side left L or right R side and the required angle 0 or 1 5 The mounting angle is fixed with two screws The sensor is slit on to the mounting angle adjuster The height over the road surface the Sensor bottom part shall be adjusted to 100 4 inch when the vehicle is loaded and ready for measurement The screw at the top of the ensor mounting plate is used to adjust the height DELTA LTL M Retroreflectometer User Manual 25 When the Sensor is level use a measurement stick at the correct height fix it with the screws in the following order 1 Fix the two screws that holds the angle adjusted 2 Fix the four screws on the side of the mounting plate 3 Fix the remaining two screws behind the angle adjuster and the Processor Connect the processor to the car power supply and turn on the processor on the button at the back of the unit The sensor is automatically powered NB If the car does not have stabilized power make sure to turn on the vehicle engine before you turn on the processor The alternative is to install an UPS Uninterruptible Power Supply system to support the vehicle power system DMI AND OVERHEAD CAMERA OPTIONAL DELTA offers with the LTL M system the option to add DMI Distance Measuring Instru ment and overhead camera to the system To make one or both options work an interconnec tion box 1s necessary the box being the connection to the LTL M system DMI Distance
34. ith number of usable satellites horizontal dilution of precision and fix no fix 1 5 7 Date and time 1 8 8 Vehicle speed VTI report 675A Evaluation of the LTL M Mobile measurement of road marking Measurement data are automatically logged 1 9 Positioning Data The instrument shall include the following as a minimum to qualify itself as GPS capable optional 1 9 1 The coordinates of the location of the instrument shall be recorded with each measure ment of retroreflection 1 9 2 The instrument will measure display and record along with the position coordinates the number of satellites used to determine such coordinates for each reading and the ho rizontal dilution of precision 1 9 3 The GPS receiver must receive all operational power from an internal supply source 1 9 4 The GPS receiver shall be contained wholly within the retroreflectometer housing 1 9 5 The accuracy of the GPS data under optimal conditions shall be 6 5 ft 2 0m CEP 2 CALIBRATION AND ACCURACY The instrument shall be supplied with a calibration standard as described below 2 1 Calibration Standard The instrument shall be supplied with a calibration reflection stand ard The standards shall be made of a durable diffuse reflector without glass beads that is uniform and consistent across the whole reflector face Calibration of the instrument will take a maximum of 5 min and can be carried out in the field The calibration standard is traceable
35. iver to position the vehicle correctly on the road the markings has to be visible at any time for correct measuring A green field shows the position of the left mark ing and a red field shows the position of the right marking if double lines being measured If only one marking is present it is considered a left marking and marked green Measurement and distance information The Measurement field shows the information entered on the driver identification of the driver and information entered on the Series ID identification of the road measured In the Measurement field is in addition displayed the length of the road to be measured if entered how much of this stretch has been measured and how much time has elapsed since the meas urement system has been started Measure distance and adjustment The Measure Distance shows the distance to where the measurement system has located a marking The geometry of LTL M system is based on 6 m 19 7 feet geometry therefore focus should be closest possible to this distance Adjust instrument tilt as necessary to obtain this value Optimal focus would be a measurement distance between 5 5 and 6 5 meters 18 2 feet On uneven roads the measurement distance may fluctuate between 5 and 7 meters 16 23 feet which are acceptable Adjustment of the camera is done with the two Tilt pos buttons Graph presentation of Ry measurement The Graph presents the actual measurement
36. level for the left green and right red mark ing If only one marking 1s measured it is marked green The graph shows the actual measured value over time Making 25 measurements per second the graph shows the values of the last 1 000 measurements or 40 seconds of measurements Mark log buttons The Mark log allows the driver to enter eight custom defined marks into the log Pushing the button briefly the mark will be logged until the button is pushed a second time Pushing the button and holding it the mark will be logged until the button 1s released One Mark log but ton can be activated at a time RL daylight contrast and marking width data This box provides the RL value the daylight contrast DC value and the width of the mark ing as an average over the last half of a second Start and stop of measurement and logging The two buttons allow the driver to start and stop the sensor START STOP Measurement and start and stop logging measurement data START STOP Logging DELTA LTL M Retroreflectometer User Manual 17 SERIES PAGE The Series page is where information on the road measured can be entered The field allows entering information on Name Direction Side and Length It is also possible to enter infor mation on reference if applicable and comments in general All the entered information will be stored in the log and information on road Name Direction Side and Length will be shown on the Main Page New serie
37. nuous measure ments and will at a driving speed up to 55 mph 90 kph provide 100 measurement coverage of the marking 4 5 Data Storage The instrument Processor shall utilize internal non volatile memory for storing measurement data The instrument shall be capable of collecting and storing the following data GPS position Day light contrast Temperature Relative humidity Day and time Driver ID Road ID Driver made remarks The GPS data shall be stored internally along with each retrore flectivity measurement Series of measurements must be identifiable by a Road ID 4 6 Data Output Measurement data and graphs will be transferred from for Processor to the GUI via an ethernet communication link for display Data can be further exported to a USB drive 4 7 Internal Error Detection The instrument must indicate on the display whenever detectable errors exist such as Lamp failure Power supply failure Overheating Calibration failure 4 8 GPS Fix The instrument during normal use must advise the operator if the GPS fails to have a fix when in operation 5 EQUIPMENT 5 1 Standard Accessories The instrument shall be equipped completely with Carrying case users manual quick guide fittings for Sensor system and GUI communications cables a calibra ted calibration standard and geometry calibration 6 SERVICE 6 1 Change of Lamp The instrument lamp can be changed in situ within 30 min by the user us ing the instruction
38. or power and to the sensor using two proprietary cables for power supply and data transfer The Pro cessor together with the Sensor is turned on and off on the green button at the back of the Processor box Data is stored on an internal hard disc The set up of the hard disk is unique to a specific instrument If you want a back up hard disk you need to mirror the existing hard disk A mirrored hard disk may be ordered at DELTA at the time of purchase The TabletPC The TabletPC is the main tool for the user to operate the LTL M system and follow the results of the measurements The Tablet PC has a number of functions described below Remember that the TabletPC screen responds to your fingers ability to transfer electricity and not to pressure and that it make take a little while for the screen to respond The TablePC Main Page DELTA LTL M Retroreflectometer User Manual Mounting and switch on The TabletPC is placed next to the driver in the holder provided with the system for easy mounting Before turning on the TabletPC turn on the Processor The TabletPC is turned on on the button at the upper right corner of the unit Once the unit has powered up unlock the display by sliding the key symbol upwards to operate the screen Unlock button Click on the DELTA icon to open the software LI e 7 f m i i 77 a t i DELTA Icon The following
39. r of meas urements recorded each of 1 m length DELTA LTL M Retroreflectometer User Manual 11 GPS Status The GPS Status field shows the quality of the GPS fix in different colors the number of sat ellite contacts and the vehicle speed See the section on GPS Status and speed on page 16 for details Measure Distance The Measure Distance field shows the actual measurement distance of the measurement camera The distance should be as close as possible to 6 m If the measurement distance is not correct the camera may be manually adjusted by the tablet PC arrows 7 Measurement The Measurement field shows various details related to the measurement The User ID The Series ID The total length of the marking to be measured if entered The remaining length of the marking to be measured The time the logging has been activated The Measurement button is where the camera flash system is started and stopped and where logging of the measurement data is started and stopped See the section on Measurements on page 17 for details Important guidelines for the correct use of the LTL M Positioning of the instrument on the vehicle The LTL M sensor needs to be mounted 10 cm above the road surface when in operation The height is important to secure that the LTL M system 15 operating according to the prescribed 30 m geometry Cleaning of sensor windows Before calibration or measuring it is recommended to clean the windows in the sensor unit The
40. ramics 15 dirty or damaged The windows of the sensor are dirty or damaged Misalignment of the instrument sensor Other visible items within view of approx same size and value as the calibration target e Direct sunlight hitting the calibration target r basis to DELTA LTL M Retroreflectometer User Manual ZI Run Alignment Run alignment ensures correlation between the internal reference of the system and the meas urement area Run alignment also identifies all constants in the measurement geometry Alignment must be done when the lamp system has been changed and as the lamp ages with frequent use every 2 months The alignment board 15 placed precisely 6 meter 19 7 feet ahead of the Sensor Make sure the alignment board is completely perpendicular to the Sensor and shade it from sunshine or other direct light sources preferably 1 a garage The alignment board Make sure the tilt is adjusted can be done from the tabletPC so the light is completely within the area of the alignment board Push the Run alignment button and the alignment is auto matically done within 20 30 seconds If the alignment is successfully done the screen in forms Alignment succeeded If the alignment fails a warning is displayed If the alignment fails and measurements are continued the previous alignment will be used Synchronize flash When a new flash system has been installed 1n the LTL M sensor the flash needs to be syn chronized Push
41. ring and DC The LTL M system measures the retroreflectivity and calculates according to the interna tional CEN and ASTM standards in mcd lux m LTL M measures in addition the daylight contrast which is a relative measurement giving the contrast ratio between the road surface and the marking Measurement results are presented as figures and DC columns and graphs directly on the system TabletPC or after transfer of data on a PC Error mes sages or warnings are shown in the display in case of any problems during use as pop up RPM s The LTL M system records automatically the presence of RPM s RPM s with a retroreflec tion of minimum 2 of the level of new RPMs as stated in EN 1463 will be recognized The data can be located in the log Data capture The LTL M system stores DC and RPM data with corresponding date time GPS coordi nates and other relevant data The following data 1s also registered e Name and other information on the road Series ID e User name Users ID e Distance to measure and to go e Width of marking e Driving speed e Comments entered during driving e Quality of GPS fix LTL M provides during driving on the system tabletPC graphical information about the RL measurement results as well as a visual view from the measurement camera allowing the driv er to navigate the vehicle DELTA LTL M Retroreflectometer User Manual 7 LTL M retroreflectometer features Mobile inst
42. rkings at 90 kph 55 mph but can measure at lower and higher driving speed At speed gt 90 kph 55 mph the coverage will be less than 100 the rate depending on the actual speed LTL M defines a marking as an area of the road surface providing a retroreflection of mini mum 40 mcd Ix m A marking will be recognized as such if it is minimum 1 m 3 feet long and minimum 5 cm 2 inch wide Double lines will be recognized if there is minimum 5 cm 2 inch between the two lines LTL M can measures markings up to minimum 50 cm 20 inch wide EN 1436 standard EU The road is illuminated at an angle of 1 24 and the reflected light 1s measured at an angle of 2 29 which corresponds to an observation distance of 30 m 98 feet ASTM E 1710 standard USA The road is illuminated at an angle of 88 76 and the reflected light 15 measured at an angle of 1 05 which corresponds to an observation distance of 30 m 98 feet This is relevant for a motorist s viewing situation under normal driving conditions The LTL M system based on 30 m geometry compressed to 6 m 19 7 feet measuring distance Further information on measuring principles and standards can be found on www roadsensors com under Technology The operation of the retroreflectometer is simple and requires minimal instruction see SECTION 3 for details RL is an important factor in the ON SITE quality control of pavement markings The LTL M sensor mounted on a vehicle Measu
43. rument for mounting on a vehicle Measuring on dry and wet marking surfaces Measures flat textured amp profiled markings Calculate daylight contrast Records presence of working RPMs Fully documented measurements with automatic data storage user and series identi fication for labeling and grouping of measurements Audible signals during use if enabled Easy calibration procedure Traceable and accredited calibrated reflection standard Results in histogram graph Average result presentation from 1 m to indefinite Options Overhead camera DMI Distance Measurement Instrument Getting started The LTL M base system consists of three parts The Sensor The Processor The TabletPC The Sensor The sensor measures the value of the markings the daylight contrast DC and the pres ence of RPMs The sensor is mounted on the left or the right side of the vehicle The sensor is being connected to the processor by two proprietary cables for power supply and data transfer The sensor 1s being turned on and off through the Processor Before starting measurements the sensor need to be calibrated see the section on Run Cal ibration on page 20 21 The Processor The processor is the unit storing and processing measurements and recorded data The pro cessor is placed in a safe place inside the vehicle preferably locked to ensure that it does not move during driving The processor is connected to the car s 12 v battery f
44. s are easily added deleted or saved using the buttons to the right All fields except Length is alphanumeric and there is no min or max length of the data en tered Entered information may be changed after the measurements have been recorded If a Series is deleted a warning will be displayed that all measurements results belonging to this Series will be deleted It is necessary to enter minimum one series to be able to log data Select active series by clicking the series name to the left of the screen Active series are marked yellow USERS PAGE The Users Page is where the name of the driver is entered if necessary adding additional comments All the entered information will be stored in the log and information on the driver will be shown on the Main Page New names are easily added deleted or saved using the but tons to the right If a User is deleted a warning will be displayed that all measurements results belonging to this User will be deleted It is necessary to enter minimum one user to be able to log data Select active users by click ing the user name to the left of the screen Active users are marked yellow Add new usr 1 Delete selected user Save Changes VIEW LOG PAGE The View Log Page shows the measured Ry values for the left green and right red line based on the average distance chosen in the Average every box The average length to be displayed can be adjusted in the Average every box The
45. s various infor mation related to diagnostics See the section on Tools Page on page 20 22 for details Settings The Settings page is used for choosing the measurement units choose measurement of the full markings or the center value only adjust the brightness of the preview field and to enable disable and adjust the overhead camera and DMI The page also offers the option to define the text for the eight mark log buttons See the section on Settings Page on page 22 24 for details Mark log option The Mark log offers the option of user defining up to eight markings being logged together with the measurements The use of the Mark log is to note situations related to the markings where special conditions exist e g dirt on the markings water on the marking etc One mark may be logged at any time See the section on Mark log on page 22 for details Measurement camera view The Measurement camera view shows during driving where the markings are situated com pared to the width of the LTL M measurement field The left marking is marked in green and the right marking in red This information will guide the driver to position the vehicle correct ly on the road See the section on the measurement camera picture on page 16 for details Measurement data presentation Measurement data values are presented in the central part of the screen as graphs and coloums and in the lower right corner as figures The value on the x axis are numbe
46. sts the brightness of the Measurement camera area of the main page from 1 to 10 Overhead camera Enable overhead camera recording LNnen ck bo deo recording irom oyernead mera Adjust overhead video camera Distance measurement Enable DMi unit Quadrature encoder connected Positive and negative signal connected Error detection for will be disabled If only positive signa Mark log texts Button 1 Town Enable overhead camera recording Enable the overhead camera by ticking the right side square Adjust the overhead camera See overhead camera section page 29 30 for details DELTA LTL M Retroreflectometer User Manual 23 Enable DMI unit Enable the DMI unit by ticking the right side square It has to be enabled to use the DELTA supplied DMI unit Quadrature encoder connected The Quadrature encoder connected has to be enabled to operate the DELTA supplied DMI unit Positive and negative signal connected The Positive and negative signal connected has to be enabled to operate the DELTA supplied DMI unit The Mark Log buttons The eight Mark Log buttons can be defined by the user Push the button and write the text FITTING AND MOUNTING OF THE LTL M SYSTEM Fitting the mounts of the LTL M system on the vehicle See Appendix A for details Mounting of the LTL M system The attachment tube is being mounted on the vehicle fittings and fixed with two screws The mounting angle adjuster is being situated to f
47. through small devices positioned on the road surface providing a strong retroreflection EN 1436 standard EU The road is illuminated at an angle of 1 24 and the reflected light 1s measured at an angle of 2 29 which corresponds to an observation distance of 30 meters 98 feet ASTM E 1710 standard USA The road 15 illuminated at an angle of 88 76 and the reflected light is measured at an angle of 1 05 which corresponds to an observation distance of 30 meters 98 feet This is relevant for a motorist s viewing situation under normal driving conditions The LTL M system based on a 30 meter geometry compressed to 6 m 19 7 feet measuring distance Optical principle LTL M is based on a new patent pending technology The LTL M measurement system makes use of high speed pulsating light digital camera technology and digital image pro cessing main advantage of LTL M 15 the ability to deliver accurate measurement results by automatic compensation of movements in the vehicle using a digital geometry correction sys tem When correctly mounted calibrated and operated the L TL M measures with a repeatabil ity of 3 and a reproducibility of 5 under all driving conditions Based on a camera system LTL M is measuring 100 of the markings offering true visibil ity 1 e measures retroreflection precisely as a driver in a vehicle as defined in the standards would view the markings spectral correction is achieved by
48. to PTB Physikalisch Technische Bundesanstalt Germany and or NIST National Institute of Standards and Technology USA 2 2 Color Correction The instrument shall be internally color corrected to allow measurement of white and yellow coloured markings without requiring recalibration using colored reflection standards 2 3 Water Spray and Stone Impact Protection To minimize build up of water droplets on the optical window or stone impact causing inaccurate readings when taking readings a protection cap will be offered with the instrument 3 CONSTRUCTION 3 1 Basic Construction The instrument consists of three parts Sensor system Processor and GUI Graphical User Interface 3 1 The Sensor system is encapsulated in a metal box consisting of a 25 hz flash light high speed camera built in GPS system and various mechanical parts The light exits and enters through glass windows 3 1 2 The Processor is encapsulated in a metal box consisting of a harddisk with data pro cessing and storage capacity 3 1 3 The GUI is contained in a TabletPC 3 2 Installation The instrument can be installed on any type of vehicle without need for adapting the vehicle for the purpose A commercial vehicle with a flat bottom is especially suited 3 2 1 The Sensor system shall come with fitting for easy mounting on the side of a vehicle 3 2 2 The Processor will not require special fitting for installation 3 2 3 The GUI will come with fittings for
49. use of advanced optical filters Notes on error sources If excessive light like direct sunlight is entering the measurement system the camera meas urements will automatically be discarded and no measurement will be logged If measure ments are logged they are correctly recorded If the markings are badly worn and no longer have the typical geometrical shape of markings measurements will be discarded If measurements are low approx 40 mcd lx m or lower they will typically be discarded It is very important to keep the window and the ceramics on the calibration unit clean The LTL M illumination angle is 1 24 relative to the road surface Because of this small an gle accurate placement of the instrument on the vehicle 15 important The LTL M retroreflectometer is a rugged instrument but it is an optical instrument and must be handled as such The LTL M 1s factory calibrated Nevertheless start measurements with a calibration Study the display for any warning Note Keep the window of the instrument and ceramics on the calibration unit clean Environmental conditions The LTL M sensor can be operated under the following environmental conditions Temperature Operating 0 45 C 32 113 Storage 15 55 C 5 131 Humidity Non condensing DELTA LTL M Retroreflectometer User Manual 15 SECTION 3 THE USER INTERFACE INTRODUCTION LTL M system is controlled via the GUI Graphical User
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