Delta LTL-XL User manual

DELTA · Venlighedsvej 4 · 2970 Hørsholm · Denmark · Tel. [phone] · [e-mail]
LTL-XL RETROREFLECTOMETER
Manual
On site quality control of road markings & road surfaces in accordance with CEN / ASTM
specifications

ii LTL-XL Retroreflectometer DELTA
DISCLAIMER
The information contained in this document is subject to
change without notice.
DELTA LIGHT & OPTICS MAKES NO WARRANTY OF
ANY KIND WITH REGARD TO THIS MATERIAL, INCLUD-
ING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICU-
LAR PURPOSE. DELTA LIGHT & OPTICS SHALL NOT BE
LIABLE FOR ERRORS CONTAINED HEREIN OR FOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES IN
CONNECTION WITH THE FURNISHING, PERFORMANCE
OR USE OF THIS MATERIAL.
LTL-XL IS BUILT ON GENERAL PUBLIC LICENSE COM-
PONENTS. THE SOURCS CODE IS AVAILABLE UPON
REQUEST.
Caution: Changes / modifications not approved by the re-
sponsible party could void the user’s authority to operate the
equipment.
NOTE: This equipment has been tested and found to comply
with the limits for a Class A digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the
user will be required to correct the interference at his / her
own expense.
Update, August, 2016
Version 1.04a English

DELTA LTL-XL Retroreflectometer
iii

iv LTL-XL Retroreflectometer DELTA

DELTA LTL-XL Retroreflectometer
v
TABLE OF CONTENTS
SECTION 1................................................................................................................................7
OPERATING INFORMATION...................................................................................................... 7
LTL-XL introduction................................................................................................................................ 7
LTL-XL retroreflectometer features......................................................................................................... 8
Options...................................................................................................................................................... 8
Getting started........................................................................................................................................... 9
Important guide lines for the correct use of the LTL-XL ....................................................................... 12
SECTION 2..............................................................................................................................13
GENERAL INFORMATION........................................................................................................ 13
Measurements......................................................................................................................................... 13
Notes on error sources ............................................................................................................................ 13
High temperature conditions................................................................................................................... 14
SECTION 3..............................................................................................................................15
THE USER INTERFACE.............................................................................................................. 15
Display and keyboard layout .................................................................................................................. 15
Measurement display / HOME screen .................................................................................................... 15
Upper icon row....................................................................................................................................... 15
Lower icon row....................................................................................................................................... 16
Push buttons............................................................................................................................................ 16
The menu tree ......................................................................................................................................... 18
Setting up for measurements................................................................................................................... 19
Selecting a User ID................................................................................................................................. 19
Selecting a road marking icon................................................................................................................. 21
Setting the date and time......................................................................................................................... 21
Setting the dimmer and back light (Display) .......................................................................................... 22
Setting the sound level............................................................................................................................ 23
Auto Sleep (Power)................................................................................................................................. 23
Auto Off (Power).................................................................................................................................... 24
Setting the language................................................................................................................................ 24
Setting the temperature unit.................................................................................................................... 24
Setting the SMART key function ........................................................................................................... 24
Using GPS (optional).............................................................................................................................. 24
Setup (basic and advanced)..................................................................................................................... 26
MEASURE TYPE........................................................................................................................... 27
RL& Qd.................................................................................................................................................. 27
Wet timer................................................................................................................................................ 27
Timer Alarm ........................................................................................................................................... 27
SERIES ID....................................................................................................................................... 28
Working with series ID........................................................................................................................... 28
Activate................................................................................................................................................... 28
Selecting a series ID ............................................................................................................................... 28
Enter a new series ID.............................................................................................................................. 29
Removing a series ID.............................................................................................................................. 29
Presetting the road marking icon ............................................................................................................ 29
THE LOG........................................................................................................................................ 31
Clearing data in the log........................................................................................................................... 31
Viewing the log....................................................................................................................................... 32
View series data...................................................................................................................................... 33
OTHER SETTINGS....................................................................................................................... 34
Average function .................................................................................................................................... 34
Editing names ......................................................................................................................................... 35
Auto print................................................................................................................................................ 35

vi LTL-XL Retroreflectometer DELTA
Diagnostics ............................................................................................................................................. 35
The help system...................................................................................................................................... 35
Errors and warnings................................................................................................................................ 36
RSC software program............................................................................................................................ 36
SECTION 4..............................................................................................................................37
MAINTENANCE............................................................................................................................ 37
General care............................................................................................................................................ 37
Protection window.................................................................................................................................. 37
Battery .................................................................................................................................................... 37
Fuses....................................................................................................................................................... 39
Lamp....................................................................................................................................................... 39
Calibration unit....................................................................................................................................... 40
Calibration .............................................................................................................................................. 41
Printer (optional)..................................................................................................................................... 43
Mounting the wheel unit (option) ........................................................................................................... 44
APPENDIX A..........................................................................................................................45
COMMUNICATION FACILITIES.............................................................................................. 45
RSC software program............................................................................................................................ 45
APPENDIX B..........................................................................................................................46
SPECIFICATION........................................................................................................................... 46
General characteristics............................................................................................................................ 46
Environmental characteristics................................................................................................................. 47
Mechanical characteristics...................................................................................................................... 47
APPENDIX C..........................................................................................................................48
DELIVERY ..................................................................................................................................... 48
Visit our web-site “www.roadsensors.com”

DELTA LTL-XL Retroreflectometer 7
SECTION 1
OPERATING INFORMATION
LTL-XL introduction
The LTL-XL retroreflectometer is a portable field instrument intended for measuring the
retroreflection and reflection properties of road markings. LTL-XL measures the RLvalue
(coefficient of retroreflected luminance at night) and the Qd value (day light visibility). RLis
a measure of the lightness of the road marking as seen by drivers of motorized vehicles in car
headlight illumination. The road is illuminated at an angle of 1.24The illumination for Qd is
diffuse. The reflected light for both RLand Qd is measured at an angle of 2.29, which corre-
sponds, to an observation distance of 30 meters. This is relevant for a motorist’s viewing situ-
ation under normal conditions. Further information on measuring principles and standards can
be found on www.roadsensors.com.
Figure 1. The instrument
The operation of the retroreflectometer is very simple and requires minimal instruction.
The LTL-XL measures the retroreflectivity and calculates RLand Qd according to the interna-
tional CEN and ASTM standards. Results are presented in plain text on a large graphic dis-
play. Error messages or warnings are shown in the display in case of any problems during use.
The memory of the instrument provides registration of measurements with corresponding
date, time and other relevant data. The following data is also registered (if enabled):
RLand Qd are important factors in the ON-SITE quality control of road markings.

8 LTL-XL Retroreflectometer DELTA
•Name of measuring series (road name)
•Profile icon for road marking type
•User name
•GPS data (if installed)
•Temperature & humidity
•Instrument status
The measurement results can be printed by the built-in printer (optional). Communication
with a PC using the RSC (Road Sensor Control) software program (see pg. 36) allows for data
exchange with other PC programs.
A rechargeable NiMH (Nickel-Metal Hydride) standard battery powers the LTL-XL, allowing
approx. 1,100 measurements on a new and fully charged battery. The optional high capacity
battery can provide approx. 2,500 measurements. A mains powered 15V power adaptor for
charging is supplied as customary delivery. Charging time is approx. 1½ hour for the standard
battery and 3½ hour for the high capacity battery. The instrument can also be charged from a
15-18 VDC source. For field charging the 15V power supply could be powered from an “AC
power inverter” connected to the car battery.
LTL-XL retroreflectometer features
•Portable instrument
•Ergonomic operation height
•Fast measurement (completed in less than 1 sec. for RLor Qd and 3 sec. for RL+Qd)
•Measuring on dry and wet surfaces
•Will measure flat, textured & profiled markings up to 5 mm
•Fully documented measurements with automatic data storage, user and series identi-
fication for labeling and grouping measurements
•Audible signals during use (if enabled)
•RSC (Road Sensor Control) PC software for data exchange. Log data can be
exported to applications such as Microsoft Excel or displayed on Google Earth
•Easy one-step calibration procedure
•Traceable and accredited calibrated reflection standard
•User replaceable battery
•Fast charging, approx. 1½ hour for standard and 3½ hour for high capacity battery
•Rechargeable from mains using power
•Average (2-99 readings)
•Multiple languages
Options
•Built-in GPS for precise logging of measuring location
•Wheel unit and extendable handle
•Build-in thermal printer
•High capacity battery

DELTA LTL-XL Retroreflectometer 9
Getting started
Buttons:
HELP ON/OFF
MENU SMART
HOME CALIBRATE
BACK PRINT
UP
LEFT RIGHT
OK (center)
DOWN
Figure 2. Buttons
Height adjustment (optional)
Before using the LTL-XL, notice that the operating panel can be adjusted in height for er-
gonomic considerations. The height is adjusted by pressing the red knob on the front of the
instrument and at the same time lifting the handle on the operating panel. Release the knob
and continue lifting until the handle locks.
Turn on
Turn on the LTL-XL by pressing and holding the ON/OFF button until the display
turns on. The instrument will be ready for measuring within 10 seconds. The LTL-XL
wakes up from standby within 1 second.
Measuring
Calibrate the instrument if needed. DELTA recommends calibrating the instrument every
time the instrument is switched on and / or starts a new series of measurements or mini-
mum once a day typically in the morning before measurement start. See Calibration, pg. 40
Place the instrument on the road marking. See positioning on the road pg. 12
Press the green OK-button to take a measurement. A single RLor Qd measurement
takes approx. 1 sec. A combined RLand Qd measurement takes 3 sec.
When the measurement is complete, the RLand/or Qd value will be displayed. Data is au-
tomatically transferred to the data log. If there is a problem with the measurement a warn-
ing icon or an error icon will pop up (see Errors and warnings, pg. 36) and an audible alarm will
sound (if enabled, see Sound settings, pg 27).

10 LTL-XL Retroreflectometer DELTA
Measurements taken with a low battery warning are marked in the log and a warning icon
appears. If battery voltage gets too low measurements can’t be taken and an error icon ap-
pears.
To print the latest measurement data, press the PRINT button (Requires the printer op-
tion).
User select (user initials)
If a user icon is displayed in the upper icon row on the measuring display, press the UP
button ▲and if necessary ◄or ►to mark the user icon. Press the OK button to enter the
user select menu. For further information see Selecting a user id, pg. 19.
Series ID select (name)
If a user icon is displayed in the upper icon row on the measuring display press the UP
button ▲to mark the road icon.Press the OK button to enter the Series ID select
menu. Select a name from the list using UP or DOWN and accept with OK or ENTER /
EDIT a new name.
If the icon is not shown or if further information is need, see Series Id, pg. 28
Calibration
The instrument is supplied with a reference calibration unit. The reference calibration unit
is factory calibrated and traceable to PTB (Physicalish-Technische Bundesanstalt, Germa-
ny) and NIST (National Institute of Standards and Technology, USA).
Calibration procedure
Before a calibration is carried out make sure that the calibration unit is clean.
To carry out a calibration go through the following steps:
•Before mounting the calibration unit check the RLand Qd values stamped on the cal-
ibration unit.
•Mount the calibration unit underneath the instrument. Make sure that the pins on the
interface plate fit into the holes on the calibration unit. Be very careful when you
place the instrument on the calibration plate not to damage the calibration unit and /
or the light diodes
•Press the CALIBRATION button once. Select RLor Qd calibration to calibrate one
at a time.
•Adjust the calibration value shown in the display so it matches the value stamped on
the calibration unit. See the Calibration section for details.
•Press the OK button to finish the calibration. If an error occurs ensure that the
•preceding steps have been taken and try again.
•Repeat the calibration process for the other quantity (RL, Qd)
The calibration procedure is now complete. Remove the calibration unit and store it properly.
Press OK to return to the measurement display. For further details see pg. 41

DELTA LTL-XL Retroreflectometer 11
Errors and warnings
An error or warning icon will appear in the upper row of the display if the LTL-XL detects
a problem. Press the UP button ▲to get a description of the most serious error or warning.
Press the UP button ▲to get a description of the most serious error or warning. Now press
the OK-button to display a total list of all errors or warnings related to the measurement and
the instrument in general.
Sound setting
Press the MENU button and select SETTINGS / SOUND. Select KEY CLICK or SOUNDS to
set the individual sound levels for key click and system sounds. Use the UP ▲or DOWN ▼
button to set the level. Accept the setting by pressing the OK button.
Miscellaneous
The HOME screen can be activated at any time by pressing the HOME button .
Reset log: Press the MENU button and select LOG / CLEAR DATA.Now se-
lect from the menu: CLEAR LAST DATA, CLEAR ALL DATA or
CLEAR SERIES DATA.
Date and time: Press the MENU button and select SETTINGS / DATE & TIME / SET
TIME/DATE. Use the UP ▲and DOWN ▼buttons to set the differ-
rent time related settings.
Power save: Press the MENU button and select SETTINGS / POWER / AUTO
SLEEP, AUTO OFF. Use ▲and ▼to edit the values.
Data exchange / communication
The RSC software program, developed by DELTA for use on a PC, allows data to be ex-
changed between the LTL-XL and a PC. See RSC-program, pg. 36

12 LTL-XL Retroreflectometer DELTA
Important guide lines for the correct use of the LTL-XL
Positioning of the instrument on the road marking
Select an area of the pavement marking that is level when taking readings. The measurement
field is marked with a yellow sticker on one side of the base cover. The measurement field is
approximately 50 mm / 1.97 inch wide and 185 mm / 7.28 inch long. Ensure that the pave-
ment marking to be measured before taking measurements is free of debris. Make sure that
the instrument is stable positioned.
Reason: The LTL-XL has three support pads, each with a small footprint, two smaller in the
front and one larger at the back. An uneven marking or a small piece of gravel trapped below
one of the pads will move the measurement field and affect the reading.
Taking the measurement
Press the green OK button to take a single or double reading as selected. Do not put pressure
on the handle when taking a measurement.
Reason: Pressure on the handle can tilt the instrument slightly and affect the measurement
geometry and thus influence the reading.
Number of measurements.
For accurate readings, do not take just one reading of a road marking. Three readings will
give a more accurate result than one reading. Five readings will give an even more accurate
result than three readings, etc. Take the readings in adjacent areas of the marking. Let the in-
strument calculate the average of the readings (fixed or moving average options).
Reason: A road marking’s retroreflectivity varies from area to area. It is not unusual to see
variations of 5% - 20% when the instrument is moved even less than 10 mm / ½” in either
direction.
Protective display shield.
For the protection of the display and longevity of the instruments keep the display shield
closed when the instrument is not used. For further information please see section 2.
Remember:
Read:
▪LTL-XL is an optical precision instrument, handle with care.
▪Keep the protection window and calibration unit clean and undamaged.
▪Store in a clean, dust free and dry environment.
Measurement practise for road markings. This leaflet can be located on:
http://www.roadsensors.com

DELTA LTL-XL Retroreflectometer 13
SECTION 2
GENERAL INFORMATION
Measurements
The LTL-XL retroreflectometer measures the RL(coefficient of retroreflected luminance) pa-
rameter and Qd (the day light visibility). The RLparameter represents the brightness of road
markings seen by drivers of motor vehicles by headlight illumination. Qd represents the visi-
bility of the road markings under day light conditions.
In the LTL-XL the illumination angle is 1.24 degrees for RL, the illumination for Qd is dif-
fuse. Both observation angles are 2.29 degrees. According to both ASTM and CEN standards
these angle simulates a driver’s viewing distance of 30 meters. The instrument’s illumination
field is approximately 185 mm x 50 mm / 1.97 x 7.28 inch.
Push the button from the HOME screen to take a measurement. Shortly after, the RLand
related information are presented on the colour display. The result is automatically transferred
to the internal memory. The measurement, along with its corresponding time, date, and other
data can be printed using the (optional) built-in printer.
Every measurement contains status information. If an error occurs the information can be in-
terpreted by the warning/error icon in the top line of the display. The information is available
until a new measurement is taken. The status information is stored in the log.
Notes on error sources
Stray light can occasionally enter the instrument but will be insignificant under normal meas-
urement conditions. The LTL-XL compensates for stray light automatically.
Instrument drift and offset errors are compensated by means of data obtained during the cali-
bration procedure. It is very important to keep the dust-protection window and the ceramic on
the calibration unit clean.
The LTL-XL illumination angle is 1.24° relative to the road surface. Because of this small
angle accurate placement on the road is important. Avoid pebbles and abnormal irregularities.
The LTL-XL must be parallel and in contact with the marking surface.
The LTL-XL retroreflectometer is a rugged instrument, but it is an optical instrument and
must be handled as such.
The LTL-XL is factory calibrated. Nevertheless start measurements with a calibration. Study
the display for any warning or error icons. See also Section 4 - Maintenance
Note
Keep the dust-protection window and ceramics on the
calibration unit clean.
Keep the battery fully charged. A well charged battery is
more resistant to aging and damage.

14 LTL-XL Retroreflectometer DELTA
High temperature conditions.
Display
If the display is exposed to intense direct sunlight during a longer period of time the display
may overheat. It is recommended to close the protective display shield. The shield also pro-
tects against damages and scratches. "Daylight readable" displays are vulnerable to high tem-
peratures. High temperature will decrease the display service life.
Battery
The battery is rated to operate between 0C / 32F and 45C / 113F.
Fig 3. LTL-XL, the inside

DELTA LTL-X Mark II Retroreflectometer 15
SECTION 3
THE USER INTERFACE
Figure 4: The HOME screen
Display and keyboard layout
The user interface consists of a rectangular display surrounded by push buttons. The display
has two main modes: the measurement display (HOME screen) and the menu display. The
instrument will start up with the measurement display shown. The display area is divided into
four areas: a large main display in the middle, an icon row at the top, a message or caption
field underneath and an icon row at the bottom.
Measurement display / HOME screen
Here the latest measured RLand/or Qd values are presented with large digits together with
other information. On the graphic in figure 4, all available information’s are shown in the dis-
play. If a function is deactivated, it will not be shown. The actual date and time is always
shown.
Upper icon row
The upper row of icons is accessed by pressing the UP button ▲. One of the icons is then
highlighted and can be activated by pressing the OK button. The other icons in the row can be
accessed by using the LEFT ◄or RIGHT ►buttons. The meanings of the icons are (from left
to right):
•Series ID selection, can be switched off (see pg.28).
•User ID selection, can be switched off (see pg. 19).
•Error/warning alarm. Will be shown in case of an error/warning (see pg. 36).
•GPS indication (see pg. 24).
•Battery status (see pg. 39).

16 LTL-XL Retroreflectometer DELTA
Lower icon row
•From the lower icon row you can select a road marking icon that will be saved together
with the measurement in the log. Access the icons by pressing the DOWN button ▼. Use
the LEFT or RIGHT button to mark the preferred icon. Pressing DOWN again shows more
icon rows from a roll stack of four rows. One row, marked with a "PR" for "Preset" can
be preset by the user (see pg. 30) and is saved separately for each measuring series. It will
be the active icon row, ready for selection, when a measuring series is selected.
•Activate the marked icon with the OK button or exit with the HOME or UP ▲button.
The selected icon is now shown in the left side of the HOME screen and the instrument
is again ready for measuring.
•Other functionality regarding the lower icon row:
Activating an already selected icon will cancel the activation and remove the icon from
the main display (and no icon will be saved by the next measurement).
Push buttons
OK
When the message row shows MEASURE, press the OK button to take a measurement. In most
other cases pressing the OK button will activate a highlighted selection.
ON/OFF
The button turns the instrument ON or OFF and enters the standby mode. Press the button to
turn the instrument ON. The start-up time is ~10 seconds when the LTL-XL is turned OFF. If
the LTL-XL is in standby it turns on within 1 second.
Press the ON/OFF button for 1 second to enter standby mode.
Press the ON/OFF button for 5 seconds to turn the LTL-XL off.
When the instrument is in standby mode, a short press on the button will turn on the display.
It is not possible to turn off the instrument during battery charging or when connected to a
USB port.
HOME
Bring you back to the measurement display.
BACK
Bring you backward one step in the menu and cancel new settings, which have not yet been
confirmed by the OK button. In most cases the LEFT button has the same function.
HELP
The button presents a context sensitive help text. The help presented will be on the subject
headline shown in the display. Another press on the button will open up a general help menu.

DELTA LTL-X Mark II Retroreflectometer 17
Menu
The button selects the top level of the menu tree, the main menu. Use the UP and the DOWN
buttons to scroll through the menu items. Press OK to select the highlighted item. In most cas-
es it opens up further submenu levels.
SMART
This button is user programmable to one out of several functions, e.g. to clear the last meas-
urement, see pg. 24.
CALIBRATE
This button starts the calibration wizard, seepg. 41
PRINT
Print out the last measurement or selected parts of the log to the (optional) printer. In the di-
agnostics menu you can print out different instrument information’s.

18 LTL-XL Retroreflectometer DELTA
The menu tree
Figure: 5 –The menu tree
SETTINGS:
USER
DATE & TIME
DISPLAY
SOUND
POWER
LANGUAGE
TEMPERATURE
SMART
AUX
SETUP
SERIES-ID:
ACTIVATE
SELECT NEW
EDIT
DELETE
PRESET MARK
AUX:
GPS
SOUND:
KEY CLICK
SOUNDS
BEEP
DISPLAY:
BACKLIGHT
DIMMER
DIM LEVEL
BACKGROUND
DATE & TIME:
TIME FORMAT
DATE FORMAT
SET TIME/DATE
TIME ZONE
SYNC TO GPS
USER:
SELECT
EDIT
NEW
DELETE
SEL. AT START
DIAGNOSTICS:
INSTRUMENT
BATTERY
BOARDS
GPS
SYSTEM
AVERAGE:
AVERAGE
TYPE
NUMBER
RESET
LOG:
CLEAR DATA
VIEW LOG
CLEAR LOG:
LAST DATA
ALL DATA
SERIES DATA
VIEW LOG:
LAST DATA
ALL DATA
SERIES DATA
MEAS. TYPE:
RL
Qd
WET TIMER
TIMER ALARM
HELP:
HELP ON KEYS
HELP ON MENU
HELP ON MEASUREMENT
HELP ON SERIES SELECT
ROAD MARKING SELECT
HELP ON USER SELECT
HELP ON EDITING
HELP ON AVERAGING
HELP ON GPS
HELP ON SETTINGS MENU
HELP ON SERIES-ID MENU
HELP ON LOG MENU
POWER:
AUTO
SLEEP
AUTO OFF
MAIN MENU
SETTINGS
MEASURE TYPE
SERIES-ID
LOG
AVERAGE
DIAGNOSTICS
HELP
AUTOPRINT

DELTA LTL-X Mark II Retroreflectometer 19
Setting up for measurements
Selecting a User ID
The user ID (user profile) is used to identify the operator and is saved in the log together with
each measurement. If enabled, it can be seen at the lower left side of the measurement display.
Measurements can also be taken without a user ID. Unlimited user ID’s can be stored in the
instrument.
Certain instrument settings are stored individually for each user. Selecting a user will restore
these settings. Following settings are stored:
•User, sel at start
•Time format
•Sync to gps
•Backlight time
•Dimmer time
•Dim level
•Background (on/off)
•Key repeat (time)
•Setup (basic/advanced)
•Auto off time
•Auto sleep time
•Key click sound level
•Sound level
•Beep (on/off)
•Activated series
•Average (on/off)
•Average type
•Average number
•Wet timer
•Wet timer alarm/measure
•Calibration value
•Temperature units (°c/°f)
•Languages
•Smart key function
The select procedure.
If a user select icon is not seen in the upper icon row:
Press the MENU button and select SETTINGS / USER / SELECT to display the USER menu.
If a user select icon is seen in the upper icon row:
Press the UP button. Then, if necessary use the LEFT or RIGHT button to highlight the user
icon. Press the OK button. The USER menu is shown:

20 LTL-XL Retroreflectometer DELTA
Now use the UP or DOWN button to highlight a user name. Press the OK button to accept the
name.
Changes made to the above mentioned individual instrument settings are automatically stored
in the selected User ID.
Selecting OFF will deactivate the user function and set all individual instrument settings to
default.
Edit user
User names can be edited from the menu SETTINGS / USER / EDIT (see editing pg. 35).
New user
A new user can be entered from the menu SETTINGS / USER / NEW (see editing pg. 35).
Clear user
Deleting the User ID will remove the user and settings from the memory.
Select at start
Enabling SEL. AT START will force the user to select a user ID each time the LTL-XL is
turned on.
Press the MENU button and select SEL. AT START. Press OK to toggle between YES and
NO