Delta RetroSign GR1 User manual

RetroSign GR1 & GR3 · Retroreflectometer 1
On site quality verification of road signs
User’s Manual
DELTA Danish Electronics, Light & Acoustics
Venlighedsvej 4 · 2970 Hørsholm · Denmark
Tel. [phone] · Fax [phone]

2 RetroSign GR1 & GR3 · Retroreflectometer
DISCLAIMER
The information contained in this document is subject to change without notice.
DELTA MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LI-
MITED TO, THE IMPLIED WARRANTIES OF MERCHANTIABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
DELTA SHALL NOT BE LIABLE FOR ERRORS CONTAINED HEREIN OR FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES IN CONNECTION WITH THE FURNISHING, PERFORMANCE OR USE OF THIS MATERIAL.
Rev.: 1.4 September 2010

RetroSign GR1 & GR3 · Retroreflectometer 3
Index
Section 1 – Introduction ....................................................................................5
RetroSign introduction .......................................................................................5
RetroSign Retroreflectometer features ..............................................................6
Options ..............................................................................................................6
Section 2 – Operating Information.................................................................... 7
Getting started ...................................................................................................7
Icons ..................................................................................................................7
Perform a measurement ....................................................................................8
Sequence ID ...................................................................................................... 8
Keyboard functions ............................................................................................8
Calibration..........................................................................................................9
Menu system ...................................................................................................10
Battery / charging............................................................................................. 13
Remote control ................................................................................................13
Support flange .................................................................................................13
Aperture reduction ...........................................................................................13
Section 3 – General Information .....................................................................14
RetroSign GR1 & GR3..................................................................................... 14
Factory calibrations.......................................................................................... 14
Measurement geometry ...................................................................................14
GR1 and GR3 type ASTM ............................................................................... 14
GR3 type CEN .................................................................................................15
GR1 type SAFETY...........................................................................................15
Battery .............................................................................................................15
Note on error sources ......................................................................................16
Section 4 – Maintenance.................................................................................. 17
General care ....................................................................................................17
Front lens.........................................................................................................17
Battery .............................................................................................................17
Lamp................................................................................................................ 17
Reference cap .................................................................................................18
Calibration........................................................................................................18
APPENDIX A – Specifications .........................................................................19
General characteristics ....................................................................................19
Environmental characteristics .......................................................................... 20
Mechanical characteristics...............................................................................20
Carrying case content........................................................................................21
APPENDIX B – Communication Facilities ......................................................22
USB specification.............................................................................................22
Bluetooth specification.....................................................................................22
APPENDIX C – Quick Guide for RetroSign Extension Kit.............................24
Preparation ......................................................................................................24
Precation.......................................................................................................... 24
Operation ......................................................................................................... 24

4 RetroSign GR1 & GR3 · Retroreflectometer
Operation with the RFID or Barcode Reader option ........................................24
Important.......................................................................................................... 25
Battery (Extension Kit MK-1)............................................................................25
APPENDIX D – GPS..........................................................................................26
GPS Implementation........................................................................................ 26
Controlling the GPS function from the menu system ....................................... 27
APPENDIX E – TAG Readers * .........................................................................28
RFID implementation .......................................................................................28
RFID spec........................................................................................................28
Barcode Reader Implementation .....................................................................29
Barcode Reader spec. .....................................................................................29
APPENDIX F – Result and Info Pages (examples)......................................... 30
APPENDIX G – RSC for RetroSign GR1 & GR3 .............................................32
RSC Log dump example:.................................................................................34
APPENDIX H – Using the Bluetooth option*..................................................36
Using the Bluetooth link to do measurements.................................................. 36
Commands that can be used on the BT connection ........................................37

RetroSign GR1 & GR3 · Retroreflectometer 5
Section 1 – Introduction
RetroSign introduction
The RetroSign Retroreflectometer is a portable field instrument intended for measuring the retroreflection properties of
road signs in car headlight illumination. The value RA(coefficient of retroreflected luminance) is used for the measure-
ment. RAis a measure of the visibility of the road signs as seen by drivers of motorized vehicles in headlight illumination.
The RetroSign is available in different versions.
For type GR3 ASTM the sign is illuminated at an entrance angle of -4º and the measurements are made with angles be-
tween illumination and observation of 0.2º, 0.5º and 1.0º. This is relevant for a motorist viewing situation under normal
conditions.
For type GR3 CEN the sign is illuminated at an entrance angle of +5º and the measurements are made with angles be-
tween illumination and observation of 0.33º, 0.5º and 1.0º. This is relevant for a motorist viewing situation under normal
driving conditions.
For type GR1 SAFETY the measurement area is illuminated at an entrance angle of +5º and the measurements are
made with an observation angle of 0.2º, angles used to measure Safety Clothing according to EN 471
The ASTM and CEN type instruments is also offered in a GR1 version with only the primary observation angles of 0.2º
(ASTM) and 0.33º (CEN).
The range of RetroSign instruments available are summarized below:
ASTM CEN Safety
RetroSign GR1 √√√1 primary observation angle
RetroSign GR3 √√3 observation angles
Geometry ASTM E 1709 EN 12899-1 EN 471
RAis an important factor in the onsite quality control of road signs.
DELTA RetroSign Retroreflectometer.
The operation of the Retroreflectometer is very simple and requires a minimum of instruction. An error or warning mes-
sage is given in case of unreliable or measurement.

6 RetroSign GR1 & GR3 · Retroreflectometer
The RetroSign measures the retroreflection and calculates RAaccording to international standards. Results are pre-
sented on an LCD panel.
Each measurement can be marked with a user defined name (measurement ID) of up to 12 alphanumeric characters and
an auto incrementing sequence number.
The memory provides on site registration of measurements with corresponding date, time, ID, measurement status, GPS
position (optional) and TAG code (optional).
The GR1 or GR3 is equipped with a USB port that gives easy PC access to measurement data and diagnostics.
The RetroSign is powered by a rechargeable battery, offering many hours of measurement capacity. A mains powered
battery charger is supplied as standard.
RetroSign Retroreflectometer features
•Portable instrument
•Measurement in full daylight
•Photopic corrected detector and source »A«
•Automatic stray light compensation and error diagnostics
•Measurement geometry and illumination corresponding to realistic viewing condition in night time traffic
•Direct digital read out
•Easy calibration procedure
•Reference cap for calibration
•Real time clock
•Automatic data storage in non-volatile memory
•Automatic programmable power off function
•USB port providing easy communication for data transfer, extended control and diagnostics
•Long lifetime battery
•230 V/ 50 Hz or 120V/60 Hz mains powered battery charger
•Small support flange with cross hair
•Aperture reducer Ø15 mm (0.60 in)
•USB cable
•Shoulder strap
•Carrying case
Options
•Extension pole kit with remote trigger, display and large support flange.
•Advanced 16 channel GPS receiver
•Barcode reader for measurement documentation
•RFID (Radio Frequency ID) tag reader, for measurement documentation using wireless smart tags
•Bluetooth (wireless communication link) for wireless data and control
•Fast 12V powered battery charger (approx. 15 minutes)
•Extra Battery.
•Aperture Reducer Ø10 mm (0.40 in)

RetroSign GR1 & GR3 · Retroreflectometer 7
Section 2 – Operating Information
Getting started
Turn the RetroSign on by pressing ON/C.
After approx. 2 seconds the display will show:
Calibrate the instrument if necessary,
See calibration section.
Icons
Instrument status and operational mode are signaled by the use of icons. Icons are shown in the top line of the display.
Instrument is calibrated and ready.
Menu selected.
Calibration selected
Zero calibration in progress.
Reference calibration in progress.
Calibration monitor active for normal aperture
Calibration monitor disable for reduced aperture
Battery fully charged
Battery getting low
Battery discharged, measurement not possible
GPS position fix, (strikeout if no fix)
Display backlight is on.
ΣMean calculation enabled
Tag reader option installed and enabled (optional)
Bluetooth option enabled and connected (optional)
Bluetooth option enabled but not connected (optional)
When is shown the instrument is calibrated and ready for use.

8 RetroSign GR1 & GR3 · Retroreflectometer
Perform a measurement
Place the instrument front on the surface to measure.
Start the measurement by pressing the red trigger knob on the handle.
The display shows WAIT for the duration of the measurement, approx. 2 seconds.
A sound (1 signals the end of the measurement and the result is displayed together with other relevant information.
If errors or warning conditions are detected during the measurement sequence, this will be shown as “Err” or “Warn” to-
gether with the result.
Sequence ID
The RetroSign has a built in function to mark each measurement with a user defined name (Sequence ID) and a unique
(2 Sequence Number automatically generated by the instrument. The Sequence ID and the Sequence Number will also
be stored in the log. The maximum length of the Sequence ID text is 12 alphanumeric characters.
1) The sound generation has to be turned on in the menu
2) The Sequence number can be edited from the menu.
Keyboard functions
Keyboard layout Trigger on handle
Push shortly to switch on the instrument.
Redisplay the last measurement result.
Clear the mean calculation when displayed
Cancellation of current menu operation.
Turn Instrument Off. Changed settings will be stored
Select menu items
Scroll keys when in menus
Parameter and value increment (+) / decrement (-)
Start instrument calibration function
Select / change settings in menus
Switch between result and status displays
Activate selected functions
Start R’ measurement.
Select quick calibration mode.
Select next calibration step
Read RFID/Barcode tag when mounted and enabled

RetroSign GR1 & GR3 · Retroreflectometer 9
Calibration
RetroSign features two levels of calibration: Quick and Full.
Quick calibration is an “everyday” calibration using zero results and reference values from the latest full calibration. This
option may only be used with the same reference unit that was used for the full calibration.
Full calibration is used for high accuracy calibration of zero and reference.
Quick calibration
Quick calibration is initiated by pressing the button and then the trigger. Mount the reference cap (reflective side)
before triggering. The display shows WAIT and the Calibration is executed immediately using previous defined refer-
ence values. If the calibration fails, the display shows a short warning message saying that the old calibration values
will be used; a status flag will be set and logged for this condition.
Full calibration
Full calibration is initiated by pressing the button and then. Follow the displayed procedure.
Zero
Mount the zero cap (dark side) on the instrument. Press the or the trigger when ready. The display shows WAIT
while measuring and then shortly displays the measured zero values. If the measured values are ok the instrument is
ready for the next step in the calibration procedure. If high zero values are measured, a warning text will be shown and
the user asked to check the black target and try again.
Reference
Mount the reference cap (reflective side). If necessary edit the displayed reference value using or until it
matches the value printed on the reference unit, press or the trigger to advance to the next reference value. When
all reference values has been checked and edited the instrument executes the calibration process. WAIT is displayed
during the actual calibration measurement and then the calculated calibration factors are shortly displayed. If errors are
detected during the calibration process a warning text is displayed and the user is asked to check the white target and
retry the calibration by pressing or the trigger again. The reference values will not need to be checked again.
When the calibration is successful, continue by pressing , or the trigger.
After a successful calibration the icon is shown and the instrument is ready for measurements. It is good practice
to do a measurement on the calibration unit immediately after the calibration to check the values.
Reduced aperture option
When the instrument is configured for measurements with reduced aperture the calibration monitor should be disabled.
This changes the checking of the calculated calibration values and displays the icon to alert the user that this op-
tion has been selected.
The instrument must be recalibrated whenever this function is enabled or disabled.
See also paragraph Aperture Reduction in this section for further information.

10 RetroSign GR1 & GR3 · Retroreflectometer
Menu system
General menu operations:
When in measurement mode pressing or activates the menu system. When in menu mode, use the and
to scroll through the functions or to change values. Press to select or accept the displayed function or value. In some
menus the key is used to switch between different selections.
Pressing terminates the menu and switches back to the results display.
Use to scroll through the menu list as shown below, using reverses the list.
Menu items:
Sequence ID: (Measurement ID)
A measurement series can be assigned a unique ID that is logged together with the results. Each measurement made
with the ID is also assigned a sequence number that automatically increments by one for each measurement.
The Sequence ID is shown as Seq ID[string] where string can be up to 12 alphanumeric characters, e.g. [CARLANE
1 XY]
To edit the sequence ID press . The display changes to show the defined ID and a line showing the new ID. To a
start the new ID will be identical to the old ID. Underneath the new ID the edit position is marked with an up-arrow
symbol. Use the edit keys to make changes to the marked position.
When defining a new ID, the sequence number will be reset to zero.
ID Count: (Display ID count for edit)
The auto incremented Sequence ID number can be changed, use the normal edit keys to change the value.
Clear ID: (Set Sequence ID to undefined)
The display shows the defined sequence ID, the ID can be set to undefined using the edit keys.
Use this option to completely remove the ID string.
Clear Work Log: (Set user log record counter to zero)
The display shows the number of records in the work log.
This function allows the user to reset the log record counter. The function can be used when starting a new measure-
ment series without first reading the records already in the log. It should be emphasized that no data actually is erased
by this operation; it is merely the presentation of the number of new records in the log that changes, and it should also
be emphasized that all old data records can still be read out at a later time. Normally this counter will be reset by the
PC program after reading the data to a file.
Sound Control: (Control generation of system sounds)
This function controls how the instrument uses sounds to report different conditions, e.g. the end of a measurement
cycle, error conditions etc.
Setting this control to off completely silences the instrument.

RetroSign GR1 & GR3 · Retroreflectometer 11
Off Timer: (Power Saver)
This function controls how long the instrument stays ON when not used. This function is to preserve power before po-
wering off. Changed values and setting will be saved, and selecting a value less than 60 seconds will disable this func-
tion.
Mean Calculation: (Calculate and display mean values)
The Mean values are calculated and displayed together with the number of measurements used for the calculation.
Shift to main display screen #2 (see appendix F) by pressing to see the calculated values.
In display line 2 the value MC= shows the number of measurements used to calculate the mean value. See appendix F
The display shows both the measured value (raw) and the calculated value (mean)
When in the main display screen #2 press two times to clear the mean calculation.
Enabling this function affects the way the Tag Reader function works. See appendix E
Calibration Monitor: (Calibration factor monitor)
The build in calibration monitor is used to check the calculated calibration factors against minimum and maximum lim-
its, it can be disabled; this should be done when using the aperture reducer’s as this can result in factors outside the
normal limits, marking the measurements with a calibration warning.
The normal limit checking is designed to be a safeguard against errors in the calibration procedure.
When the Monitor is enabled the icon displays, when disabled the icon displays.
IMPORTANT: the instrument must be recalibrated whenever changing form normal to reduced aperture and
vice versa.
Remote-Box Display: (Select result for extender box display)
The remote trigger can only display one result at a time, this function selects which result to display on the remote trig-
ger unit, the normal setting would be the primary observation angle of 0.2º or 0.33º
Display Backlight: (Control LCD backlight)
The automatic LCD display backlight function can be disabled. Doing so will allow for more measurements on the
same battery charge, as backlighting consumes lots of energy.
DGPS Mode: (Select GPS position correction method) (Optional)
The GPS receiver can use different methods to obtain greater position precision by using different correction signal
sources.
Depending on the location, different systems can be selected:
WAAS should be used in North America.
EGNOS should be used in Europe.
Auto: should select the best possible available correction signal. However, not all systems may be fully operational or
they may be in test modes. Selecting a wrong correction system might actually reduce the precision.
Disable: Don’t use any correction signals.

12 RetroSign GR1 & GR3 · Retroreflectometer
GPS State: (Control the GPS function) (Optional)
The GPS receiver can be disabled if desired, the main reason for doing this would be to reduce the overall power con-
sumption maximizing the number of possible measurements on the available battery charge.
Tag Reader: (Control the RFID or Barcode reader option) (Optional)
The GR1 and GR3 have an option for inputting data from an external RFID or Barcode reader. This will make it possi-
ble to use RFID tags or standard Barcodes to uniquely identify signs.
Enabling the reader option changes the way the instrument behave when taking measurements. When no reader is
connected this option must be disabled
When enabled, the instrument will ask for a Tag on the first trigger. When the tag has been read the instrument will do
the measurement on the second trigger. See appendix E
When the Mean Calculation is enabled the instrument will only ask for the tag on the first measurement in a series
(Mean Count < 2). This allows for doing multipoint measurements with the same Tag code.
After clearing the mean calculation the instrument will again ask for the Tag on the first trigger.
Remove Latest Measurement: (undo the most recent measurement)
It is possible to remove the most recent measurement record from the work log. To maintain data integrity only one da-
ta record can be removed and only if it is done before the instrument is turned off.

RetroSign GR1 & GR3 · Retroreflectometer 13
Battery / charging
Never disconnect the battery while the instrument is turned on as this may result in lost data and malfunction of the in-
strument.
Temperatures in excess of 50º C (122º F) will damage the battery. Do not short circuit the battery. Do not dispose with
household waste.
To remove the battery swing the battery retaining spring over, and disengage the battery from the handle. See Section 4
- Battery for further information on charging.
Remote control
External trigger option (Optional)
By connecting a remote trigger box to the rear connector on the instrument it is possible to do measurements using an
extension pole.
As an accessory an Extension pole kit can be supplied.
Computer interface
The instrument is equipped with a device USB port; this allows complete remote instrument control and measurement
data collection.
Use the Road Sensor Control (RSC) software to offload measurement records or to control the RetroSign.
Use of the USB connection requires the installation of a special software driver on the PC which can be found on the
instrument CD..
See Appendix B - Communication facilities.
Support flange
The support flange is provided with cross hair markings. It makes it easier to decide the measuring position when taking
measurements on small objects, e.g. letters and numbers on a sign.
Aperture reduction
For special measurement requirements on small targets, the RetroSign can be mounted with a special aperture reducer
adaptor; this reduces the field of measurement to either ø 15 mm (0.6 in) or ø 10 mm (0.4 in) depending on the unit used.
The ø 15 mm is supplied with the RetroSign while the Ø 10 mm is optional.
To achieve the smaller aperture, the reduction unit is simply mounted in front of the lens barrel.
Disable the Calibration Monitor when using the Reducer!
See Menu Items on how to disable the monitor.
IMPORTANT! Remember always to calibrate the instrument after changing the aperture setting.
Note:
•RetroSign is an optical precision instrument, handle with care.
•Store in clean and dry environment.
•Do not recharge after using the instrument only briefly.
•Never remove the battery when the instrument is ON
•Carefully check and clean the reference cap, the reading is very sensitive to contamination.

14 RetroSign GR1 & GR3 · Retroreflectometer
Section 3 – General Information
RetroSign GR1 & GR3
The RetroSign Retroreflectometer measures the RA(coefficient of retroreflected luminance) parameter. The R’ parameter
represents the retroreflection of the road signs seen by drivers of motor vehicles by headlight illumination.
Physically the Retroreflectometer is a small hand held instrument. It is constructed in aluminum housing, containing elec-
tronics and an optical system. The measurement trigger button and the replaceable battery are housed in the handle.
The RetroSign is controlled by a micro controller that executes a measurement automatically when the trigger is acti-
vated. The result and status are shown on the LCD display. The result and other related information is automatically
transferred to the internal non-volatile memory. The RetroSign is operated from a small keyboard on the left hand side of
the Retroreflectometer. The Retroreflectometer control is also possible using a USB device connection. The USB con-
nection is used to transfer data records to a PC for further processing.
Factory calibrations
The RetroSign GR1 and GR3 is factory calibrated. This calibration is carried out using a standard. The reference’s RA
value is measured in the laboratory using traceable methods and equipment.
The enclosed reference cap should be used for verification and recalibration of the Retroreflectometer.
Measurement geometry
GR1 and GR3 type ASTM
The illumination angle is -4°. The offsets between the illumination and the primary observation angle are 0.2° (GR1) and
the three observation angles are 0.2°, 0.5°and 1.0° (GR3) respectively. The measurement area is approx. ø 30 mm. in
the standard configuration, ø 15 mm or ø 10 mm when using the reduced aperture adaptors.
ASTM geometry

RetroSign GR1 & GR3 · Retroreflectometer 15
GR3 type CEN
The illumination angle is +5°. The offsets between the illumination and the primary observation angle are 0.33° (GR1)
and the three observation angles are 0.33°, 0.5°and 1.0° (GR3) respectively. The measurement area is approx. ø 30
mm. in the standard configuration, ø 15 mm or ø 10 mm when using the reduced aperture adaptors.
CEN geometry
GR1 type SAFETY
The illumination angle is +5° and the offsets between the illumination and observation angle is 0.2°. The measurement
area is approx. ø 30 mm. in the standard configuration, ø 15 mm or ø 10 mm when using the reduced aperture adaptors.
CEN EN 471 geometry
Battery
The RetroSign is powered by a replaceable rechargeable battery, which under normal operation will keep the Retroref-
lectometer operating for many hours. The battery must be recharged by the included external charger. See Section 4 -
Battery.
0.2°
Cloth

16 RetroSign GR1 & GR3 · Retroreflectometer
Note on error sources
Before measuring
The RetroSign is factory calibrated; nevertheless, begin important measurements sessions with a calibration, dust and
smear from touching the optical surfaces might influence the measured values considerably.
It is very important to keep the instrument front lens and the white reference cap clean.
See also Section 4 - Maintenance.
Instrument orientation
The RetroSign can take measurements without being in close contact with the sign surface. But to obtain the most relia-
ble results the front of the RetroSign should be in contact with, and perpendicular to, the sign surface when taking mea-
surements.
Sign conditions
The optical property of a sign alters when the retro reflective material becomes wet. The RetroSign can take measure-
ments on wet or dewy sign surfaces but readings are not comparable with readings taken on dry signs.
Because of the special optical properties of micro prismatic sheeting, precautions like turning the instrument correctly
and holding it vertical should be taken to get correct readings. Always use the RetroSign in the angle specified for the
sign.
Normally the RetroSign instrument must be held in the vertical position.
Leakage
During each measurement the RetroSign automatically evaluates the leakage (optical background signal) and the result
are compensated before read out. Leakage will under normal conditions not be significant. Nevertheless, leakage may
occur and a warning will be shown in the display. Leakage is primarily caused by stray light entering the optics between
the sign and the instrument.
Instrument leak, drift and offset errors are compensated for by means of data obtained during the calibration procedure,
so perform the calibration procedure carefully.
Low battery condition
The instrument always monitors the battery voltage and automatically blocks for further measurements when the battery
voltage gets very low. Due to the nature of the battery it may happen, when the instrument is turned on, that the voltage
will be high enough to start a measurement but not to turn the light source on causing the measurement to fail.
Doing measurements with a nearly discharged battery should be avoided as this might influence the measured values.

RetroSign GR1 & GR3 · Retroreflectometer 17
Section 4 – Maintenance
General care
The Retroreflectometer is constructed for outdoor use in fair weather conditions. The Retroreflectometer will withstand
moist weather, but caution must be taken against rain or splashes and dirt form traffic. The RetroSign Retroreflectometer
is a robust instrument, but it is an optical instrument and must be handled as such.
Avoid exposing the instrument to high mechanical shocks and vibrations.
Avoid exposing the instrument to rapidly changing temperatures.
When not in use store the instrument in the caring case in a clean and dry environment.
Front lens
The lens does not need special maintenance. If dirty carefully moist the lens with ordinary window cleaning liquid and
clean it with a soft linen cloth.
Battery
The instrument is powered by a NiMh battery, which under normal use requires no maintenance.
A battery charger is provided as a standard accessory for charging the battery from mains.
To recharge the battery first make sure that the instrument is off, then release the battery retaining spring, remove the
battery from the handle and insert it in the charger.
Please refer to the enclosed charger instructions for operation.
A new battery or one which has not been used for an extended period of time will reach full performance only after ap-
prox. 5 charging and discharging cycles.
The battery is equipped with a temperature monitor that only allows charging within a range between 0°C and 45°C
(32°F and 113°F). This ensures long battery life. When used properly, the battery can be recharged up to 1000 times.
A substantial drop in obtainable measurements on a fully charged battery indicates that the battery is worn out and must
be renewed.
The Battery and the charger are specifically designed for use in conjunction with one another. Charging should be done
only with the charger delivered with the instrument.
Do not expose the battery to heat or flames: Danger of explosion. Do not place the battery on a heater or expose to
direct sunlight for long periods. Temperatures in excess of 50°C (122°F) will damage the battery. Allow a warm battery to
cool before charging. When handling or storing the battery take special care to avoid possible short circuiting the battery
contacts.
Avoid repeated consecutive rapid charges of the battery. Do not recharge after using only briefly.
Note
•The battery should be protected against impact. Do not open the battery.
•Store the battery in a dry place.
•Due to environmental protection do not dispose the battery with household waste.
Lamp
The lamp requires no maintenance. At the end of the lamps service life the instrument will display a lamp error message,
and the lamp must be replaced.
The lamp must be replaced only by DELTA or personal trained by DELTA.

18 RetroSign GR1 & GR3 · Retroreflectometer
Reference cap
To make sure that the calibration of the Retroreflectometer is correct it is important that the surface on the reference cap
is clean and undamaged. Keep the cap protected, and be careful not to touch the reference cap (reflective side).
If the surface is stained, scratched, or broken the reference cap must be replaced.
In case of dust on the surface, clean the reference cap gently by using a soft cloth with a mild household detergent. Wipe
carefully with dry linen cloth afterwards.
To ensure reliable measurements, it is recommended that the reference cap is periodically recalibrated to a traceable
standard. DELTA Light & Optics offers calibration traceable to PTB (Physikalisch-Technishe Bundesanstalt) and NIST
(National Institute of Standards and Technology). For information contact your local distributor or DELTA Light & Optics,
Denmark.
Calibration
The RetroSign is factory calibrated, but a calibration should always be carried out before starting a series of measure-
ments.
The calibration process automatically compensates for instrument offsets, leakage and other known “errors” and calcu-
lates calibration factors for each observation angle.
After a calibration the Retroreflectometer will display »true« RAvalues.
Store the reference cap in a dry and clean environment.
Reference cap.

RetroSign GR1 & GR3 · Retroreflectometer 19
APPENDIXA – Specifications
General characteristics
Type ASTM
Geometry ASTM E-1709
Illumination angle................................................................................-4°
observation angles........................................................... 0.2°, 0.5°, 1.0°
Type CEN
Geometry CEN EN 12899-1
Illumination angle...............................................................................+5°
observation angles......................................................... 0.33°, 0.5°, 1.0°
Type SAFE
Geometry CEN EN 471
Illumination angle...............................................................................+5°
observation angle .............................................................................0.2°
Light source angular aperture...........................................................0.1°
Receptor angular aperture................................................................0.1°
Field of measurement ....................................................... ø 30mm/1.2in
Light source ......................................................................Illuminant »A«
Receptor sensitivity.............................................. Precise eye corrected
(ASTM-E1709para. 6.4.2 for selected color filters)
Min. reading (cd/lx×m²)......................................................................... 0
Max reading (cd/lx×m²) ................................................................. 2000
Electrical characteristics
EMC ........................................................................... EN 61326 : 2007
Low Voltage…………………………………Not applicable, battery driven
ROHS………………Compliance to the requirement of and its exception
Directive 2002/95/EC, 2002/96EC Annex 1A
Power supply:
Battery ................................................. Replaceable NiMh 9.6 V/2.6Ah
External charger ...................................... Mains voltage 230 V / 50 Hz
Optional: 110V / 60 Hz
Charge time ............................................................ approx. 15 minutes
Data memory ..................................................> 250.000 measurements
Interface...........................................................................................USB
RFID tag reader.....................................................13.56MHz ISO15693
Barcode reader..................................... 617nm LED Solid state scanner
Interface................................................................................... Bluetooth

20 RetroSign GR1 & GR3 · Retroreflectometer
Environmental characteristics
Operation temperature:....................................................................0°to +50°C
32°F to 122°F
Storage temperature:................................................................ -15°C to +55°C
5°F to 131°F
Humidity ................................................................................. Non condensing
Mechanical characteristics
Length.......................................................................................295mm/ 11.6 in
Width...........................................................................................83 mm / 3.3 in
Height ......................................................................................324 mm/ 12.8 in
Weight........................................................................................ 2.1 kg / 4.6 lbs
RetroSign dimensions.